# FlashStacks vs H1 Owl

The clearest difference is update cadence: FlashStacks at weekly against H1 Owl's monthly. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. FlashStacks sells 3 in-app purchases, starting at $4.99 per month and H1 Owl sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

FlashStacks ships an update weekly, H1 Owl monthly. The most recent releases landed on October 12, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | FlashStacks | H1 Owl |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/flashstacks-flashcard-study/id6762071988/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Monthly |
| Monetization | Freemium | — |
| Size | 10 MB | 65 MB |
| Requires iOS | 17.6 | **16.4** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Bailey Skewes](https://appshunter.io/developer/1892771018) | [Elvis Barisic](https://appshunter.io/developer/6786441554) |

## What reviewers say

### FlashStacks

[App page](https://appshunter.io/ios/app/flashstacks-flashcard-study/id6762071988)

Transform study materials into interactive Home Screen widgets. AI generates flashcards from PDFs, and spaced repetition optimizes learning. Visualize concepts with image occlusion and track progress with detailed stats.

**Highlights:** Home and Lock Screen widgets, AI-powered PDF to flashcard generation, Spaced repetition learning, Image occlusion cards, Progress tracking and stats, Customizable widget themes

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| FlashStacks Premium — Monthly | $4.99 | per month |
| Premium Special Offer | $24.99 | per year |
| FlashStacks Premium — Annual | $39.99 | per year |


### H1 Owl

[App page](https://appshunter.io/ios/app/h1-owl/id6793202406)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $5.99 | per month |
| Pro Yearly | $39.99 | per year |


## Frequently asked questions

### Is FlashStacks free?

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

### Is H1 Owl free?

H1 Owl is free to download, with in-app purchases available.

### Do FlashStacks or H1 Owl have ads?

Neither FlashStacks nor H1 Owl shows ads.

### Which is updated more often, FlashStacks or H1 Owl?

FlashStacks ships an update weekly, and H1 Owl monthly. Most recently, FlashStacks was updated on October 12, 2026 and H1 Owl on October 21, 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.*