# BiAffect vs suntime.

The clearest difference is rating: suntime. at 5.0 against BiAffect's 4.3. suntime. also leads on update cadence (every 2 weeks vs monthly). BiAffect's advantage is in-app purchases (none vs 2) and ratings volume (12 vs 1). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. suntime. sells 2 in-app purchases, starting at $1.99 per month. BiAffect asks for nothing beyond the download.

suntime. holds the better App Store score, 5.0 against 4.3. That said, the two scores are not equally well evidenced: BiAffect has 12 ratings behind it against 1, so its average is the more settled of the two.

BiAffect ships an update monthly, suntime. every 2 weeks. The most recent releases landed on October 9, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | BiAffect | suntime. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.3 (12 ratings)](https://appshunter.io/ios/app/biaffect/id1355144276/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/suntime/id6760936532/reviews)** |
| Number of ratings | **12** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free** | Freemium |
| Size | 36 MB | 67 MB |
| Requires iOS | 16.1 | **15.1** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 17+ |
| Developer | [University of Illinois](https://appshunter.io/developer/422670617) | [Chris Dziuba](https://appshunter.io/developer/1886925954) |

## 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


### suntime.

[App page](https://appshunter.io/ios/app/suntime/id6760936532)

This app offers real-time UV tracking, personalized sun safety timers, and gamified insights to help users enjoy the outdoors without sunburn. It provides features like smart UV timers, sunscreen effectiveness tracking, and UV forecasts for safe outdoor planning.

**Highlights:** Real-time UV tracking, Personalized sun safety timers, Sunscreen effectiveness tracking, Protective gear logging, UV forecasts, Gamified SunScore, Family mode for multi-member tracking

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| suntime. Premium Monthly | $1.99 | per month |
| suntime. Premium Yearly | $9.99 | per year |


## Frequently asked questions

### Is BiAffect free?

BiAffect is free to download, with no in-app purchases.

### Is suntime. free?

suntime. is free to download, with in-app purchases available.

### Which has better reviews, BiAffect or suntime.?

suntime. is rated higher. BiAffect averages 4.3 out of 5 from 12 ratings, while suntime. averages 5.0 from 1 ratings.

### Do BiAffect or suntime. have ads?

Neither BiAffect nor suntime. shows ads.

### Which is updated more often, BiAffect or suntime.?

BiAffect ships an update monthly, and suntime. every 2 weeks. Most recently, BiAffect was updated on October 9, 2026 and suntime. on October 3, 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.*