# MemPie AI vs PenFill

The clearest difference is update cadence: PenFill at daily against MemPie AI's every 5 days. MemPie AI's advantage is device support (3 vs 1) and iOS requirement (12.0 vs 16.6). On price, ads and in-app purchases there is nothing between them.

Both are free to download. MemPie AI sells 2 in-app purchases, starting at $1.99 per month and PenFill sells 10 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

MemPie AI ships an update every 5 days, PenFill daily. The most recent releases landed on October 17, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | MemPie AI | PenFill |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 days | **Daily** |
| Size | 106 MB | 41 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ichi Hosotsuji](https://appshunter.io/developer/1808829369) | [Sho Handa](https://appshunter.io/developer/1895400851) |

## What reviewers say

### MemPie AI

[App page](https://appshunter.io/ios/app/mempie-ai/id6744670157)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 暗記Pai月間プレミアムプラン | $1.99 | per month |
| 暗記Pai年間プレミアムプラン | $19.99 | per year |


### PenFill

[App page](https://appshunter.io/ios/app/penfill/id6763618010)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 数学モード(月額) | $4.99 | per month |
| ライフ +20 | $0.99 | one-time |
| セーブ数 +3 | $2.99 | one-time |
| ライフ +50 | $2.99 | one-time |
| セーブ数 +7 | $5.99 | one-time |
| ライフ +100 | $5.99 | one-time |
| 広告削除 | $6.99 | one-time |
| ライフ +250 | $11.99 | one-time |
| プレミアムパック | $59.99 | one-time |
| コンプリートパック | $99.99 | one-time |


## Frequently asked questions

### Is MemPie AI free?

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

### Is PenFill free?

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

### Do MemPie AI or PenFill have ads?

Both MemPie AI and PenFill show ads.

### Which is updated more often, MemPie AI or PenFill?

MemPie AI ships an update every 5 days, and PenFill daily. Most recently, MemPie AI was updated on October 17, 2026 and PenFill on October 24, 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.*