# Stackd vs AI Study Sheet

The clearest difference is update cadence: AI Study Sheet at every 3 days against Stackd's fortnightly. AI Study Sheet also leads on iOS requirement (16.0 vs 18). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Stackd sells 1 one-off in-app purchase and AI Study Sheet sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Stackd ships an update fortnightly, AI Study Sheet every 3 days. The most recent releases landed on September 14, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Stackd | AI Study Sheet |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Size | 3 MB | 3 MB |
| Requires iOS | 18 | **16.0** |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Nene Nakagawa](https://appshunter.io/developer/1821103094) | [Masaki Iino](https://appshunter.io/developer/6778272211) |

## What reviewers say

### Stackd

[App page](https://appshunter.io/ios/app/stackd-study-timer-and-tracker/id6761293821)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stackd Pro | $1.99 | one-time |


### AI Study Sheet

[App page](https://appshunter.io/ios/app/ai-study-sheet-active-recall/id6782023263)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Saves | $4.99 | one-time |


## Frequently asked questions

### Is Stackd free?

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

### Is AI Study Sheet free?

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

### Do Stackd or AI Study Sheet have ads?

Neither Stackd nor AI Study Sheet shows ads.

### Which is updated more often, Stackd or AI Study Sheet?

Stackd ships an update fortnightly, and AI Study Sheet every 3 days. Most recently, Stackd was updated on September 14, 2026 and AI Study Sheet on September 10, 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.*