Comparison

sleep vs Open Bridge

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

sleep

This tool helps you understand your body's natural sleep needs and circadian rhythm. Measure alertness variations with simple tests to optimize your daily schedule for peak performance and wellbeing. Export your data for personal use or research.

Highlights
  • Measure alertness variations
  • Identify unique circadian rhythm
  • Optimize sleep and activity schedules
  • Scientifically validated reaction time test
  • Track texting speed variations
  • Exportable user data
Features
Read full description

Sleep-2-Peak is a highly sensitive scientific tool developed by sleep specialists that will show you your best sleep and work/activity schedule by measuring your alertness variations. No other device or wearable required. Figure out your unique circadian rhythm and how to be most alert during the day. Use sleep-2-Peak to demonstrate to others your sleep need and ideal work/activity schedule contributing to your wellbeing. Your alertness variations are measured with a scientifically validated, short and simple reaction time test and/or through Text-Speed able to track your texting speed variations (patent pending). Your results are linked to your previous night bedtime/out of bed time to see what sleep schedule allows YOU to be at your BEST the next day. Your reaction time variations throughout the day are also demonstrated on a second graph to see what time of day is associated to your best performances. Ideal for high performance athletes, executives, and anyone else who wants to know the best time to sleep, workout, and even engage in analytical and creative activities. Researchers can also use sleep-2-Peak in their studies of fatigue and alertness as its reaction time test is proven to be as sensitive as the widely used PVT or even more sensitive for some aspects (sleep-2-Peak compared to the gold standard PVT-192). It is also more practical as every subject can have their own measuring device and transfer their data if desired to the researcher. Developed by a neurologist specialized in sleep medicine, cognitive psychologists with expertise in sleep and alertness and experts in digital health. Our fatigue measurement reaction time task is scientifically validated in a peer reviewed publication: Brunet, J. F., Dagenais, D., Therrien, M., Gartenberg, D., & Forest, G. (2017). Validation of sleep-2-Peak: A smartphone application that can detect fatigue-related changes in reaction times during sleep deprivation. Behavior Research Methods, 49, 2, 1460-1469. >10 poster publications that validate the use of the app for measuring physical and cognitive states. Your data is YOURS. You can export your data to your computer and select data you would like to export to others. Your data could also contribute to a global database to allow a better understanding of circadian rhythms and what can be done to improve schedules and wellbeing. In this event, your permission will be required to have your data entered in the database. The application was developed to be sensitive to detect: - Sleep need - The circadian rhythm (alertness variation with time of day and body rhythms) - Mental and physical performance variation (correlation with reaction time test) - Influence of substances By using sleep-2-Peak, you will become aware of alertness variations beyond what you can feel. You will discover how powerful your schedule choices can be to boost your performances naturally. FREE * Measure your alertness level and circadian variations * Link your bedtime schedule and substance use (coffee, alcohol…) to your results * See graphics of your best bedtimes and best alertness times * Get averages and other stats related to your reaction time tests and texting speed * Store and export up to 7 days of data PREMIUM ($2.99 USD/month or $19.99 USD/year subscription with auto-renew) * More precise best bedtimes and work/activity schedule with increased use * Long term alertness level trends and effect of habit changes * Measure your alertness level and circadian variations * Link your bedtime schedule and substance use (coffee, alcohol…) to your results * See graphics of your best bedtimes and best alertness times * Get averages and other stats related to your reaction time tests and texting speed * Store and export all your data * This subscription will auto-renew Privacy and terms of use: http://www.neurosummum.com/sleep2/Neuro-Summum-sleep-2-Peak-End-User-License-Agreement-EULA.pdf

About

Open Bridge

Contribute your data to scientific research studies focused on cognition. Complete scheduled activities, similar to puzzles or memory tests, directly on your phone. Your identity is protected as the app collects data solely for research purposes.

Highlights
  • Contribute data for research studies
  • Complete scheduled cognitive activities
  • Activities resemble puzzles and memory tests
  • Data used solely for research
  • Protects user identity
  • Developed by non-profit research organizations
Read full description

Open Bridge is for adults ages 18+ to collect data for research studies. The Open Bridge app lets you contribute data for research. It is used by many research organizations who study cognition. If you choose to join a Open Bridge study, you will use the free app to complete activities on your phone on a pre-set schedule. The activities may resemble puzzles, or they may test your memory. The data collected from the activities help researchers learn more about cognition. Your data will only be used for research. We will not collect your name through the app. This helps protect your identity. Every research study is different, but most studies will take about 30-40 minutes each week and will last for different lengths of time. If you are already part of a Mobile Toolbox study, you can contact your Study Coordinator if you have questions about the study you have joined. Sage Bionetworks, a non-profit research organization in the USA, developed the Open Bridge app. Washington University and Sage Bionetworks developed the activities on the app. Open Bridge supports research studies. It does not provide medical advice, diagnosis, or treatment.

Screenshots

sleep4 screens
Open Bridge1 screens

Verdict

The call

The clearest difference is review sentiment: sleep at 73% against Open Bridge's 0%. sleep also leads on device support (3 vs 1) and iOS requirement (9.0 vs 16.4). Open Bridge's advantage is in-app purchases (none vs 3) and update cadence (every 5 weeks vs every 8 months). On price and ads there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. sleep sells 3 in-app purchases, starting at $2.99 per month. Open Bridge asks for nothing beyond the download.

UpkeepUpdate frequency

sleep ships an update every 8 months, Open Bridge every 5 weeks. The most recent releases landed on October 23, 2026 and October 6, 2026 respectively.

Scorecard6 real differences · 4 level
sleep versus Open Bridge: the parameters behind the verdict, then further details
ParametersleepOpen Bridge
PriceFreeFree
Rating—5.0 (5 ratings) — better
Positive reviews72.7% of reviews — better0.0% of reviews
Number of ratings—5 — better
Update frequencyEvery 8 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS9.0 — better16.4
Further details — not scored
Size27 MB41 MB
Age rating4+4+
DeveloperNeuro Summum Inc.Sage Bionetworks, a Not-For-Profit Research Organization

Customer experience

sleep

Written reviews11 reviews
Positive72.7%
Neutral0.0%
Negative27.3%

Open Bridge

All ratings5 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

3 purchases

sleep

Subscriptions3
  • sleep-2-Peak Premium7 Days trial$2.991 Month
  • sleep-2-Peak Premium Monthly$2.991 Month
  • sleep-2-Peak Premium Yearly$19.991 Year
None

Open Bridge

No in-app purchases

Questions

Is sleep free?
sleep is free to download, with in-app purchases available.
Is Open Bridge free?
Open Bridge is free to download, with no in-app purchases.
Do sleep or Open Bridge have ads?
Neither sleep nor Open Bridge shows ads.
Which is updated more often, sleep or Open Bridge?
sleep ships an update every 8 months, and Open Bridge every 5 weeks. Most recently, sleep was updated on October 23, 2026 and Open Bridge on October 6, 2026.

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