# Do [Not] Forget vs Lattern

The clearest difference is in-app purchases: Do [Not] Forget at none against Lattern's 4. Do [Not] Forget also leads on ads (none vs shown) and iOS requirement (15.0 vs 17.0). On price, update cadence and device support there is nothing between them.

Both are free to download. Lattern sells 4 in-app purchases, starting at $2.99 per 7 days. Do [Not] Forget asks for nothing beyond the download.

Do [Not] Forget ships an update every 3 days, Lattern every 4 days. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | Do [Not] Forget | Lattern |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Every 4 days |
| Size | 2 MB | 22 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Ilias Rafailidis](https://appshunter.io/developer/1874647979) | [J&B Creations LLC](https://appshunter.io/developer/1895160810) |

## What reviewers say

### Do [Not] Forget

[App page](https://appshunter.io/ios/app/do-not-forget/id6759411664)

**Features:** macOS Compatibility

**In-app purchases:** none


### Lattern

[App page](https://appshunter.io/ios/app/lattern-memory-grid-puzzle/id6775867842)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lattern+ Weekly | $2.99 | per 7 days |
| Lattern+ Monthly | $4.99 | per month |
| Lattern+ Yearly | $19.99 | per year |
| Lattern+ Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is Do [Not] Forget free?

Do [Not] Forget is free to download, with no in-app purchases.

### Is Lattern free?

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

### Do Do [Not] Forget or Lattern have ads?

Lattern shows ads; Do [Not] Forget does not.

### Which is updated more often, Do [Not] Forget or Lattern?

Do [Not] Forget ships an update every 3 days, and Lattern every 4 days. Most recently, Do [Not] Forget was updated on October 17, 2026 and Lattern on October 7, 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.*