# Red Sheet vs retention+

The clearest difference is ads: retention+ at none against Red Sheet's shown. On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Red Sheet sells 1 in-app purchase, starting at $2.99 per year and retention+ sells 10 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 4 days. The most recent releases landed on October 5, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | Red Sheet | retention+ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 days | Every 4 days |
| Size | 180 MB | 23 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [N-Verse LLC](https://appshunter.io/developer/1868412567) | [WONYEONG NA](https://appshunter.io/developer/6783655961) |

## What reviewers say

### Red Sheet

[App page](https://appshunter.io/ios/app/red-sheet-kun-ai-study-sheets/id6775183078)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Red Sheet-kun Premium Annual | $2.99 | per year |


### retention+

[App page](https://appshunter.io/ios/app/retention-plus/id6783655959)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| retention+ 월간 구독 | $0.99 | per month |
| retention+ 연간 구독 | $9.99 | per year |
| Developer Support I | $0.49 | one-time |
| Developer Support II | $1.99 | one-time |
| Developer Support III | $2.99 | one-time |
| Developer Support IV | $5.99 | one-time |
| Developer Support V | $9.99 | one-time |
| Developer Support VI | $17.99 | one-time |
| Developer Support VII | $34.99 | one-time |
| Developer Support VIII | $69.99 | one-time |


## Frequently asked questions

### Is Red Sheet free?

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

### Is retention+ free?

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

### Do Red Sheet or retention+ have ads?

Red Sheet shows ads; retention+ does not.

### Which is updated more often, Red Sheet or retention+?

Red Sheet ships an update every 4 days, and retention+ every 4 days. Most recently, Red Sheet was updated on October 5, 2026 and retention+ on October 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.*