Comparison

BiAffect vs Neurokeys

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

Head to head
About

BiAffect

This ResearchKit study explores the link between mood and cognitive function in bipolar disorder using typing patterns and passive sensor data. Both individuals with bipolar disorder and healthy participants are needed to help identify objective biomarkers.

Highlights
  • Keystroke dynamics analysis
  • Passive sensor data collection
  • Mood and neurocognitive study
  • Bipolar disorder research
  • Control group participation
Read full description

Thank you for trying BiAffect. In this ResearchKit study, we would like to understand the relationship between mood and neurocognitive functioning in bipolar disorder using keystroke dynamics (such as typing speed and typing errors) and other passive sensor information (such as the accelerometer). You don't have to be a person with bipolar disorder to help us test this app—we also need healthy participants to use the app and serve as a control group. Currently, diagnosis and treatment of bipolar disorder rely on careful history taking and examination by a clinician, at times aided by self-report or caretaker-informed questionnaires. In general, these reports have to be interpreted by providers in order to extract patterns that could indicate an imminent change in mood. Moreover, they do not necessarily represent objective psycho-physiological markers. On the other hand, the pervasive use of mobile wireless devices has significantly shaped interpersonal communications in modern life. Indeed, as personal smartphone technology advances, people are increasingly interacting with one another via typed (rather than oral) communications. For this reason, we want to investigate if keyboard dynamics and sensor data from iPhone serve as more objective biomarkers or 'virtual mental-health footprints' of bipolar disorder and mood in general.

About

Neurokeys

Read full description

What if your phone could help advance brain health research? With Neurokeys, it can. Every tap on your keyboard tells a story — about focus, coordination, and how your brain is feeling today. Neurokeys gently analyzes how you type (never what you type), and turns that everyday signal into a powerful tool for science. Combined with optional smartphone signals like heart rate, step count, and flights climbed, Neurokeys helps researchers build digital biomarkers for motor function and cognition — insights that may transform our understanding of Multiple Sclerosis, Alzheimer's Disease, ADHD, and other neurological conditions. Why join Neurokeys? - Be part of meaningful research — your data fuels studies that could change millions of lives. - Privacy by design — we only see how you type, never what you write. Your messages stay yours. - You stay in control — decide which permissions to share, and change your mind anytime. - One-minute setup — install, opt in, and you're contributing. - Runs quietly in the background — no daily tasks, no surveys, no interruptions to your day. How it works - Download Neurokeys and complete a quick setup. - Choose which permissions you'd like to enable — including location, notifications, and Apple Health access. You can adjust or revoke them anytime. - Use your phone as you normally would — Neurokeys does the rest. - Every keystroke becomes a small contribution to a bigger mission: better understanding of the human brain. HIPAA & GDPR compliant · FDA registered (US) · Investigational device (EU) · Fully anonymized · Withdraw anytime. Join a growing community helping science move forward — one tap at a time. Download Neurokeys today.

Screenshots

BiAffect3 screens
Neurokeys4 screens

Verdict

The call

The clearest difference is iOS requirement: BiAffect at 16.1 against Neurokeys's 18.2. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

BiAffect ships an update monthly, Neurokeys every 2 weeks. The most recent releases landed on November 2, 2026 and October 29, 2026 respectively.

Scorecard1 real difference · 9 level
BiAffect versus Neurokeys: the parameters behind the verdict, then further details
ParameterBiAffectNeurokeys
PriceFreeFree
Rating4.6 (11 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings11 — better—
Update frequencyMonthlyEvery 2 weeks — better
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPod — betteriPhone
Requires iOS16.1 — better18.2
Further details — not scored
Size36 MB186 MB
Age rating12+4+
DeveloperUniversity of IllinoisNeurocast BV

In-app purchases

None

BiAffect

No in-app purchases

None

Neurokeys

No in-app purchases

Questions

Is BiAffect free?
BiAffect is free to download, with no in-app purchases.
Is Neurokeys free?
Neurokeys is free to download, with no in-app purchases.
Do BiAffect or Neurokeys have ads?
Neither BiAffect nor Neurokeys shows ads.
Which is updated more often, BiAffect or Neurokeys?
BiAffect ships an update monthly, and Neurokeys every 2 weeks. Most recently, BiAffect was updated on November 2, 2026 and Neurokeys on October 29, 2026.

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