Understand dual n-back
Read the rules, then compare positions and letters in the tutorial.
Roméo Apps
Practical instructions and exercises for the 19 RomeoApps projects: memory, habits, voice, chess, offline preparation, reflection and goals. Each guide identifies its app, sources and limits.
Choose what you want to do, then follow the two suggested steps. The full guide collection is available below.
Read the rules, then compare positions and letters in the tutorial.
Calculate a score before comparing sessions with the same settings.
Start with an explained technique, then plan regular exercises.
Choose the routine steps, then browse the available charts.
Learn to structure a prompt, then examine worked examples.

Understand position matches, sound matches and the meaning of N before your first dual n-back session.

How a reaction-time task differs from a Stroop task, what each one loads, why your scores swing so much, and how to compare results without fooling yourself.

Session lengths and frequencies used in dual n-back research, what the evidence shows about transfer, and how to set realistic expectations.

Where the idea of working memory comes from, how researchers measure it, why its capacity is limited, and what an n-back task actually asks of it.

An honest walk through the research on dual n-back: what improves, what does not, why the meta-analyses disagree, and how to train without fooling yourself.

Understand what changes at each n-back level, compare position and sound correctly, and choose a difficulty using accuracy rather than an arbitrary target.

The habits that make dual n-back scores look better than they are, from guessing and level-chasing to training tired, and what to do instead.

Understand hits, misses and false alarms in dual n-back. Compare scoring formulas with a worked example and an interactive calculator.

Dual n-back, digit span, complex span, Stroop, reaction time and commercial brain-training suites, what each demands, and what the evidence supports for each.

Compare single and dual n-back with a worked 2-back example. Understand streams, difficulty and what your results can actually tell you.

Log dual n-back sessions, compare scores with the same settings, and save or reload a CSV. Free browser tool, worked example and no account needed.

Can you increase your IQ? Understand education, practice effects and the limits of brain training, then learn how to practise dual n-back on iPhone.

Understand the chimp memory test, practise remembering numbered positions and compare scores fairly. Discover the memory exercises in Dual N-Back for iPhone.

Learn the difference between remembering a pattern, an ordered sequence and a numbered layout. Simple examples help you choose a memory exercise on iPhone.

Use active recall, feedback and spaced review to study a subject. Follow a concrete example and understand how learning a course differs from dual n-back.

Cannot hear the letters in dual n-back? Check iPhone media volume, Bluetooth output and app settings, then gather useful details if the problem continues.

Understand audio, feedback, N-levels, progression locks and session length with an annotated screenshot of the Dual N-Back iPhone app.

How to play the classic 5×5 Schulte table, what your time really measures, what the evidence says about speed reading, and practical ways to get faster.

A practical before-and-after worksheet for changing N while keeping the rest of your session comparable.

Understand an interrupted dual n-back run, distinguish session allowance from saved results and prepare a clean next attempt.

A practical way to choose settings, keep sessions comparable and learn from errors without turning one score into a promise.

Recognise congruent and incongruent colour words, calculate a fictional response-time difference and read it with accuracy and protocol limits.

Compare reaction-time trials on the same device, read the median alongside errors, and understand what a phone result can show.

Understand why short-term memory is passive storage while working memory is active manipulation, how it predicts fluid intelligence, and how to strengthen cognitive control.

Define fluid reasoning, examine the historical Jaeggi experiment and distinguish its test outcomes from claims about an iPhone app.

What belongs in a written quit plan, why if-then plans outperform intentions, how to choose a date, prepare your hardest situations and decide in advance what happens after a slip.

Why recording cravings changes what you can do about them, the five fields worth keeping, when to write them down, and how to turn a week of notes into a plan.

What a craving is, why it passes on its own, the responses public health services recommend, how to prepare for your own triggers, and what to do after a slip.

A plain description of nicotine withdrawal after stopping vaping: why it happens, the usual shape of the first days and weeks, symptoms people do not expect, and when to ask for help.

Cold turkey, tapering, nicotine replacement, medication, behavioural support and self-monitoring: what each approach asks of you, and how to choose a first attempt.

A simple method to calculate what vaping costs you per week, month and year, with worked examples, disposables versus refillables and the forgotten costs.

Why appetite and weight can change after stopping nicotine, what the evidence says about limiting it, and an order of steps that protects the quit.

Why sleep can be disrupted when you stop vaping, how long it usually lasts, the caffeine trap, and practical steps for the first weeks of nights.

Why single-use vapes are harder to cut down, a step-by-step plan to stop, the support options, and how to get rid of used devices safely.

For people who switched from cigarettes to vaping: when to stop vaping, how to lower the risk of smoking again, and which order of steps is safest.

Why anxiety can rise in the first weeks without nicotine, what studies of people who quit smoking found about mood later, and how to get through the dip.

What to do in the hour after a slip, why the first weeks matter most, what research on lapses shows, and how to restart your quit the same day.

Prepare departure, travel and arrival without using an app while driving.

Check PuffOff’s notification preference, iPhone permission and delivery filters without confusing a reminder with emergency support.

Map urges, prepare small substitutions and know when professional quit support belongs in the plan.

What to record and why, how a streak counter can work against you, using desk reminders deliberately, and how to read a week of entries into a plan.

Why photographs beat memory for a slow-changing habit, how fast nails really grow, the setup that makes two pictures comparable, and why no date should be promised.

The four components of habit reversal training, why awareness comes first, what makes a competing response work, how the method was simplified over time, and what the evidence supports.

Nail biting as a body-focused repetitive behaviour: what triggers it, why it feels useful, why it is so hard to notice, its physical consequences, and when it is worth seeing a professional.

A step-by-step account of habit reversal training for nail biting, what a competing response is, what to change in your environment, and what to do after a slip.

Is nail biting a sign of anxiety? What research says about stress, boredom and frustration, and what helps when tension keeps the habit going.

Fingernail growth rates from research, why bitten nails can look uneven for months, what helps them recover, and when damage needs a doctor.

What studies found when bitter nail polish was compared with a competing response, how to use it well, its real limits, and the safety points.

Why cuticle and hangnail picking starts, the infection risk around the nail, practical steps to stop, and when picking is worth a professional.

How common nail biting is in children, what tends to set it off, why nagging backfires, what actually helps, and when to talk to a doctor.

What nail biting actually does to nails, skin, teeth and quality of life, which effects matter most, and which signs mean it is time to see a doctor.

Trichotillomania, skin picking disorder and nail biting belong to one family, body-focused repetitive behaviours. What they share, how they differ and what helps.

Check camera access and the viewing angle before relying on a Desk Mode reminder.

Inspect NailSafe’s progress card before sharing and distinguish that image from stored hand photos and their deletion.

A calm tracking method for noticing hands, situations and replacement actions when nail biting happens.

Habit trackers, awareness tools, bitter coatings and clinical programmes: what each approach actually does, what it cannot do, and how to check any of them before you install.

A repeatable order for writing image prompts, what to put in each part, the common mistakes that flatten a result, and how to iterate so that each attempt teaches you something.

Complete prompts for an architectural interior, a city moment, an object, a landscape, a food shot and a workspace, each broken down sentence by sentence so you can adapt them.

What each part of a prompt does inside an image generator, why one sentence per decision works better than a wall of adjectives, and how to adapt a prompt without breaking the thing that made it work.

How to write Midjourney prompts that read as photographs: a camera-first structure, the documented parameters that help, and how to iterate.

How to prompt ChatGPT for believable luxury and lifestyle images: materials, light, restraint, worked examples, and care with brands and disclosure.

Describe believable people in AI images: posture, clothing, skin, hands and light, plus the consent, likeness and disclosure rules that come with it.

Golden hour, blue hour, window light, backlight, low key and more: what each lighting term looks like in a photo and how to write it in an AI prompt.

What a negative prompt is, which image tools document one, how Midjourney's --no and Stable Diffusion's negative_prompt work, and why to use them sparingly.

Square, 3:2, 16:9 or vertical 9:16: how to pick an aspect ratio for an AI image, how composition changes with it, and how Midjourney and OpenAI set it.

What focal length, aperture, shot size and camera angle actually change in a photo, and how to write them into an AI image prompt so the result looks real.

Compare two versions of a prompt while recording the generator and settings you used.

Choose the target image tool in LarpGPT, inspect the copied text and distinguish prompt description from tool-specific parameters.

Specify exact words and placement, inspect the result and choose between generated lettering and text added in an editor.

A repeatable prompt structure for subject, light, lens language and constraints, with examples that are easier to refine.

Prompt libraries, prompt builders, in-generator assistants and writing it yourself: what each saves you, what each costs you, and which one teaches you anything.

What survives a network outage, why text beats calls when everyone is dialling, how to keep documents readable offline, and how to make a phone last when there is nothing to charge it with.

Why kits fail at maintenance rather than at assembly, how to build a list by walking through the box, what to record for each item, and how to run an annual review that takes under an hour.

What the United States government actually recommends storing, how much water and food, how to treat suspicious water, what to do when the power goes out, and how to keep the kit current.

What an evacuation go-bag should hold, using the Red Cross and Ready.gov lists: water, food, medicines, documents, cash, and what each person adds.

The EPA’s exact steps for boiling water and disinfecting it with unscented bleach, what these methods cannot remove, and how to store treated water.

What to prepare before a blackout, how long food stays safe, generator and carbon monoxide rules, and medical devices, from Ready.gov and the Red Cross.

The parts of a baseplate compass, how to take and follow a bearing, orient a map, correct for magnetic declination, and avoid readings disturbed by metal.

The American Red Cross list for a family first aid kit, item by item, plus personal medicines, where to keep kits, checking expiry dates and getting trained.

How to secure your home, what to do during the shaking with Drop, Cover, and Hold On, and what to check afterwards, from Ready.gov, ShakeOut and the Red Cross.

What to prepare before a hurricane, what a watch and a warning mean, where to shelter, and the dangers that remain once the wind has dropped.

Separate offline access from Pro access and missing household information before you rely on your phone.

Try a harmless message between two nearby Surv phones and understand range, foreground, privacy and emergency-service limits.

A practical checklist for power, information, contacts and basic supplies when networks or electricity are unreliable.

What Ready.gov asks you to have before a wildfire warning, how to split the list between go-bag, car and house, and why the plan must work with the network down.

How to prepare a home for extreme heat, what to do when the air conditioning stops, and the warning signs of heat exhaustion and heatstroke to watch for.

Alert apps, offline reference guides, checklist tools and paper: which ones still work when the network does not, and what to check before you need them.

What hertz actually describes, why a single reading means little, how to keep two recordings comparable, and how to read a range without chasing a target number.

How to organise vocal practice so it stays short, comparable and safe: choosing one goal, listening before repeating, keeping a record you will actually maintain, and knowing exactly when to stop.

Why gradual preparation matters before speaking or singing, the everyday habits that protect a voice, the signs that mean stop, and when hoarseness becomes a reason to see a doctor.

What actually makes a voice sound deeper, what practice can change, what anatomy fixes, and why pushing your voice down tends to backfire.

Speaking range versus singing range, how to find your lowest and highest notes with gentle slides, and why one measurement is never the whole answer.

Compare measured speaking pitch for adult men and women. See how age, loudness and study methods affect the figures, and why averages are not targets.

Practical exercises for breath, volume, pace, pauses, articulation and endings that make a speaking voice steadier, with recordings to check progress.

Learn what speaking from your chest means, try gentle humming and breathing exercises, and avoid forcing your voice lower.

What vocal fry is in the larynx, where it shows up in speech, what listener studies found, what is known about harm, and how to reduce it if you want to.

What natural pitch really means, why the classic 25% rule does not match real voices, simple ways to find where your voice rests, and signs you are pushing it.

Troubleshoot missing voice data without interpreting an empty result as a voice or health score.

Read one VocalMaxx recording’s vocal frequency median, P10–P90 range and semitone stability without treating them as health scores.

How to warm up gently, record useful comparisons and stop before practice turns into a voice problem.

Where to hold the phone, how loud to speak, what to record every week and how to listen back without judging yourself out of practising.

Pitch meters, guided courses, recording journals and speech therapy: what each one measures, what it cannot judge, and when a person is the right answer.

Retrieval versus computation, where working memory runs out, why carrying is the expensive part, why anxiety costs accuracy, and what all of that means for how you practise.

How long a session should be, why spacing and mixed problems beat long blocks, why being tested beats reviewing, and how to measure progress without letting the timer run the session.

Left-to-right calculation, compensation, doubling and halving, shortcuts for 5, 9, 11 and 25, squares, estimation and division by chunking, with a practice method that actually sticks.

Build any percentage from 10%, 5% and 1%, swap the numbers when it helps, and handle discounts, tips, tax and percentage change without a calculator.

Four ways to multiply two-digit numbers without paper: splitting, rounding and correcting, the difference of squares and numbers near 100, with worked examples.

How to prepare for interview arithmetic in consulting, finance and trading: estimation, zeros, percentages, growth, the rule of 72 and calculating out loud.

Timed sprints, target-number puzzles, the 24 game, dice and card games, duels and estimation: how each format works, what it trains and how to keep it honest.

What number sense is, what research on estimation and magnitude does and does not show, and practical exercises that build a feel for numbers.

Division as a missing multiplication, halving chains, dividing by 5, 25 and 125, chunking, estimating quotients, and turning remainders into decimals.

How few facts you really need, tricks for the 9s, the 6s and the other hard ones, and practice methods from research that make the multiplication table stick.

Calculate 30% then 15%, work backward from the final price and check the effect of rounding.

Simplify a fraction, convert a finite decimal and distinguish an exact answer from a rounded approximation.

Distinguish a negative sign from subtraction, check worked integer examples and enter a signed result in Numvolt.

Compare two pack sizes on the same unit basis, follow the division and check quantities, rounding and limits.

Use brackets, equal-priority operations and explicit notation to check a calculation before adding speed.

Use mental arithmetic to practise methods, check errors and build speed without confusing a fast guess with a reliable answer.

Master practical mental arithmetic techniques for fast two-digit multiplication, squaring and distributive breakdown without pen or paper.

Drill apps, method teachers, competitive trainers and flashcards: which one builds speed, which one builds understanding, and why the difference shows up later.

A plain account of ringing in the ears: what causes it, what the guidelines recommend, and which treatments have evidence behind them.

Why tinnitus is loudest at night, what sound to use and at what level, and the sleep habits that make the biggest difference.

A step-by-step method for matching the frequency of your tinnitus with a tone generator, and what to do with the number once you have it.

Supplements, drugs and devices sold for tinnitus, and what the clinical practice guideline actually recommends against.

Why new tinnitus feels catastrophic, what changes over weeks and months, and how to tell progress from a bad day.

Noise exposure is a recognised cause of tinnitus. Practical protection at concerts, at work and with headphones, without living in silence.

Which medicines are linked to tinnitus, why dose and frequency matter, which effects fade and which may not, and why not to stop a prescribed medicine alone.

Why tinnitus and anxiety feed each other, what the psychological model of tinnitus distress describes, what the evidence on CBT shows, and practical steps.

Choose a comfortable way to play tinnitus background sounds. Compare speakers and headphones, check the timer, and recognise when to seek care.

Choose a sound timer, check its gradual stop and distinguish a playback setting from a tinnitus treatment.

A calm guide to sound exposure, listening habits and the limits of a tinnitus-support app.

What temporary tinnitus after a concert or a loud event usually means, what helps in the first days, and when to get your hearing checked.

How the common background sounds differ, why a lower pitch often feels softer, and how to choose a level that supports you without covering everything.

A short method for logging louder days, the four things worth recording, and how a journal turns bad nights into a useful conversation with a clinician.

What a sensible training week looks like during perimenopause, menopause and after: how many sessions, how hard, and what to do on the days you feel flat.

A beginner’s path into strength training after 50, with the five movements that matter, how many sets, and how to know you are working hard enough.

Why fat moves to the middle during menopause, what training actually does about it, and which promises to ignore.

Which exercise protects bone after menopause, what the LIFTMOR trial found, and how to train safely if you have been told your bone density is low.

Leaks when you cough, laugh or lift are common after menopause and often improve with training. Here is what the evidence supports and how to practise correctly.

A complete standing and seated workout built around a sturdy chair, for stiff mornings, small flats and days when the floor is not an option.

Falls are the outcome exercise prevents best. What the Cochrane review found, and a five-minute daily balance routine you can do in a kitchen.

Protein targets for women over 50 from the PROT-AGE recommendations, why spreading it across the day matters, and what a day of ordinary food looks like.

An honest look at exercise, hot flushes, broken sleep and low energy during menopause, including where the evidence is weak.

Why the back of the arm softens after 50, what training changes, and a short arm session you can do beside a worktop.

The three stages defined by the STRAW+10 framework, what changes physically in each, and how to adapt training rather than starting over.

How much walking counts, what step-count studies found after 60, how brisk is brisk, how to add intervals, and what walking cannot do on its own after menopause.

Return to strength exercise with a manageable first session, a simple comfort log and gradual choices. Use your current capacity rather than old scores.

Check your condition and the saved workout before resuming; an available resume button is not medical clearance.

How to begin with manageable movements, recovery and clear goals without turning an exercise app into medical advice.

Why a conversation translator should keep both languages in view, how DuoTalk handles speech and text, and its translation limits.

A simple preparation checklist for language choice, short phrases, confirmation and privacy when a conversation goes through a translation app.

What to ask about speech, storage and supported languages before trusting a new conversation translator, and how DuoTalk answers each question today.

Separate speech recognition from translation, simplify ambiguous phrases and confirm key details without assuming the tool is right.

Separate a speech-recognition error from a translation error and use typed input for a clearer source phrase.

A calm method for the message that leaves you blank: name what the other person shared, answer it, add one thing of your own, and know when a short reply is enough.

Start from something specific and shared, keep the first message short and easy to answer, and take turns. What research says about first contacts, without pick-up lines.

Follow-up questions, balanced turns and replies that give the other person something to hold: practical habits for written conversations that fade too quickly.

What a study of apologies found to matter most (owning the mistake and offering to repair it), the words that undo an apology, and when a message is not the right place.

Declining an invitation or setting a limit in writing: why a refusal usually costs less than feared, a three-part structure, and how to respect a no that you receive.

Writers overestimate how well their tone comes across, and readers tend to read neutral messages as colder than intended. What the research found, and five habits that reduce misunderstandings.

How Clutch counts a fragment of an exchange on the iPhone, what each number means, why the share card contains no name and no message text, and the limits of reading a relationship in statistics.

Why a message after a long silence is appreciated more than people expect, what to write first, how to mention the gap, and what to do if no reply comes.

Make one clear request, distinguish a real deadline from impatience and leave space for the other person to decline.

Remove one saved analysis or local history, then distinguish that action from deleting the original chat or shared copies.

How to turn a school morning into picture steps a young child can follow: what to include, where timers help, how to encourage, and what research on routines shows.

Reward charts, sticker charts and token boards: what research on rewards and praise shows, how to choose targets and rewards, and how to phase a chart out.

What a good bedtime routine contains, how much sleep children need at each age, what studies found, and how to handle screens and stalling at lights out.

What visual supports are, what research says for autistic children, where they sit in ADHD care, and how to build a picture schedule your child can use.

Build a short visual arrival routine, separate essential steps from homework and adjust it using what actually happens at home.

Export a routine as a PDF, check its picture steps and keep a usable paper copy when the device is put away.

Separate the timer signal from step completion and help a child finish without turning the routine into a race.

Identify what an exercise asks you to do, choose a clear practice goal and interpret scores without treating them as a diagnosis.

Set a manageable first session, learn the response rules and record enough context to make your next session comparable.

Read personal exercise records and check-up results separately, compare matching settings and avoid interpreting either as IQ or a diagnosis.

Choose CSV and JSON exports, check the optional journal and inspect files before saving or sharing them.

Distinguish three chess tactics, check the defender’s replies and turn a missed puzzle into a useful practice note.

Use a repeatable calculation checklist: inspect the position, compare candidate moves and test the opponent’s best defence.

Separate puzzle difficulty, your solving rating and experience points, then use results to choose a useful next practice session.

Use a missed puzzle to reconstruct the threat and defence, then distinguish recall from a fresh calculation.

Choose a session aim, separate calculation from speed, and finish with a review limited to the positions you studied.

Build an answer around an idea, a reason and an example, then check what your listener can take away.

Find an observable change between two answers and choose one specific next action.

Choose birth details carefully, understand their limits and turn a symbolic reading into a personal question.

Distinguish sources, missing days and completed actions without turning measurements into a diagnosis.

Choose observable commitments, record a session and return after a missed day without erasing your history.

Build a useful connection between a dated action and a longer intention without filling every horizon.

Distinguish a completable action, a tracked quantity and a life direction without a score.