# AST UPAS vs StudySync

The clearest difference is update cadence: StudySync at fortnightly against AST UPAS's every 3 months. AST UPAS's advantage is iOS requirement (12.0 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

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

AST UPAS ships an update every 3 months, StudySync fortnightly. The most recent releases landed on May 16, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | AST UPAS | StudySync |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/studysync-snyder-lab/id6756796122/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | — | Free |
| Size | 11 MB | 43 MB |
| Requires iOS | **12.0** | 18.5 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Access Sensor Technologies](https://appshunter.io/developer/1437331333) | [Stanford University](https://appshunter.io/developer/292922032) |

## What reviewers say

### AST UPAS

[App page](https://appshunter.io/ios/app/ast-upas/id1543735564)

**Features:** macOS Compatibility

**In-app purchases:** none


### StudySync

[App page](https://appshunter.io/ios/app/studysync-snyder-lab/id6756796122)

This mobile application serves as the companion for a specific research study. Participants must be pre-enrolled to use its features. It is developed by the Snyder Lab at Stanford University.

**Highlights:** Research study participation, Onboarding required, Stanford University developed, Mobile companion app

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is AST UPAS free?

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

### Is StudySync free?

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

### Do AST UPAS or StudySync have ads?

Neither AST UPAS nor StudySync shows ads.

### Which is updated more often, AST UPAS or StudySync?

AST UPAS ships an update every 3 months, and StudySync fortnightly. Most recently, AST UPAS was updated on May 16, 2026 and StudySync on September 16, 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.*