# Stacky vs Einstein Study AI Coach

The clearest difference is ads: Einstein Study AI Coach at none against Stacky's shown. Stacky's advantage is iOS requirement (15.1 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Stacky sells 6 in-app purchases, starting at $3.99 per month and Einstein Study AI Coach sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

Stacky ships an update every 2 days, Einstein Study AI Coach every 3 days. The most recent releases landed on September 29, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Stacky | Einstein Study AI Coach |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (28 ratings)](https://appshunter.io/ios/app/stacky-clever-facts-feed/id6752566923/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 2 days** | Every 3 days |
| Monetization | Free with in-app purchases | — |
| Size | 121 MB | 18 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 4+ |
| Developer | [Oleksii Lypskyi](https://appshunter.io/developer/1839914104) | [Daniel Plata](https://appshunter.io/developer/1467546479) |

## What reviewers say

### Stacky

[App page](https://appshunter.io/ios/app/stacky-clever-facts-feed/id6752566923)

Discover fascinating facts across various topics with a personalized feed. Engage with AI chat to explore topics further and test your knowledge with fun quizzes. Save and share your favorite insights.

**Highlights:** Daily facts across science, history, tech, and more, Personalized fact feed, AI chat for deeper exploration, Fast and fun quizzes, Save and share favorite facts

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stacky Premium | $3.99 | per month |
| Stacky Premium Plus Monthly | $7.99 | per month |
| Stacky Premium Pro Monthly | $14.99 | per month |
| Stacky Premium Yearly | $19.99 | per year |
| Stacky Premium Plus Yearly | $39.99 | per year |
| Stacky Premium Pro Yearly | $79.99 | per year |


### Einstein Study AI Coach

[App page](https://appshunter.io/ios/app/einstein-study-ai-coach/id6754023929)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly | $5.99 | per month |
| Premium annual | $19.99 | per year |


## Frequently asked questions

### Is Stacky free?

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

### Is Einstein Study AI Coach free?

Einstein Study AI Coach is free to download, with in-app purchases available.

### Do Stacky or Einstein Study AI Coach have ads?

Stacky shows ads; Einstein Study AI Coach does not.

### Which is updated more often, Stacky or Einstein Study AI Coach?

Stacky ships an update every 2 days, and Einstein Study AI Coach every 3 days. Most recently, Stacky was updated on September 29, 2026 and Einstein Study AI Coach on September 13, 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.*