# Polygraf vs StudyTrail

The clearest difference is update cadence: StudyTrail at every 3 days against Polygraf's every 6 months. Polygraf's advantage is iOS requirement (9.0 vs 16.4). 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.

Polygraf ships an update every 6 months, StudyTrail every 3 days. The most recent releases landed on October 2, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Polygraf | StudyTrail |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/studytrail-ai-flashcards/id6768227448/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 days** |
| Monetization | — | Free |
| Size | 40 MB | 26 MB |
| Requires iOS | **9.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Masaryk University](https://appshunter.io/developer/443178424) | [itokazu yuu](https://appshunter.io/developer/1896551611) |

## What reviewers say

### Polygraf

[App page](https://appshunter.io/ios/app/polygraf/id443178421)

**Features:** macOS Compatibility

**In-app purchases:** none


### StudyTrail

[App page](https://appshunter.io/ios/app/studytrail-ai-flashcards/id6768227448)

Create AI-powered flashcards from your notes, images, and PDFs using various AI models. This privacy-focused app offers local storage, no account needed, and integrated study logs to track progress. Designed for medical students and clinicians preparing for exams and lifelong learning.

**Highlights:** AI flashcard generation, Supports multiple AI models, Local data storage, No account required, Integrated study logs, Import notes, images, PDFs

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

**In-app purchases:** none


## Frequently asked questions

### Is Polygraf free?

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

### Is StudyTrail free?

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

### Do Polygraf or StudyTrail have ads?

Neither Polygraf nor StudyTrail shows ads.

### Which is updated more often, Polygraf or StudyTrail?

Polygraf ships an update every 6 months, and StudyTrail every 3 days. Most recently, Polygraf was updated on October 2, 2026 and StudyTrail on October 9, 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.*