# Undeafen vs Open When

The clearest difference is in-app purchases: Undeafen at none against Open When's 1. Undeafen also leads on device support (3 vs 1) and iOS requirement (15.1 vs 17.0). Open When's advantage is update cadence (daily vs every 3 weeks). On price and ads there is nothing between them.

Both are free to download. Open When sells 1 in-app purchase, starting at $2.99 per month. Undeafen asks for nothing beyond the download.

Undeafen ships an update every 3 weeks, Open When daily. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Undeafen | Open When |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/open-when-letters-for-later/id6795863189/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Daily** |
| Monetization | — | Freemium |
| Size | 33 MB | 9 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 12+ | 12+ |
| Developer | [Shubham Vashishth](https://appshunter.io/developer/1882020556) | [Moon Radio Candy](https://appshunter.io/developer/6795771875) |

## What reviewers say

### Undeafen

[App page](https://appshunter.io/ios/app/undeafen/id6759970255)

**In-app purchases:** none


### Open When

[App page](https://appshunter.io/ios/app/open-when-letters-for-later/id6795863189)

Write and send thoughtful letters to yourself and others, to be opened at a specific moment or date. Create personalized messages with prompts or your own ideas, and cherish memories by saving letters as keepsakes.

**Highlights:** Write letters for specific moments, Seal letters for future opening, Use meaningful prompts, Create custom moments, Exchange letters with friends, Save letters as keepsake PDFs

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Open When Membership | $2.99 | per month |


## Frequently asked questions

### Is Undeafen free?

Undeafen is free to download, with no in-app purchases.

### Is Open When free?

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

### Do Undeafen or Open When have ads?

Neither Undeafen nor Open When shows ads.

### Which is updated more often, Undeafen or Open When?

Undeafen ships an update every 3 weeks, and Open When daily. Most recently, Undeafen was updated on October 28, 2026 and Open When on October 31, 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.*