# BiAffect vs Neurokeys

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.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

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

## The numbers

| Metric | BiAffect | Neurokeys |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (11 ratings)](https://appshunter.io/ios/app/biaffect/id1355144276/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 36 MB | 186 MB |
| Requires iOS | **16.1** | 18.2 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [University of Illinois](https://appshunter.io/developer/422670617) | [Neurocast BV](https://appshunter.io/developer/1252625745) |

## What reviewers say

### BiAffect

[App page](https://appshunter.io/ios/app/biaffect/id1355144276)

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

**In-app purchases:** none


### Neurokeys

[App page](https://appshunter.io/ios/app/neurokeys/id1436297061)

**In-app purchases:** none


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*