# Space Letters vs XenoSignal

The clearest difference is in-app purchases: Space Letters at none against XenoSignal's 4. Space Letters also leads on update cadence (daily vs every 3 months) and iOS requirement (13.0 vs 18.6). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. XenoSignal sells 4 one-off in-app purchases. Space Letters asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Space Letters against 5.0 for XenoSignal. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Space Letters ships an update daily, XenoSignal every 3 months. The most recent releases landed on November 4, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Space Letters | XenoSignal |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/space-letters/id6479270951/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/xenosignal-alien-comm-and-wiki/id6749178646/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | **Daily** | Every 3 months |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 27 MB | 73 MB |
| Requires iOS | **13.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Paul Brecht](https://appshunter.io/developer/1620703287) | [ADAVII (PVT) LTD](https://appshunter.io/developer/1711708818) |

## What reviewers say

### Space Letters

[App page](https://appshunter.io/ios/app/space-letters/id6479270951)

Connect with people across the galaxy through unique intergalactic letters. Ask profound questions, share jokes, or send love. Spend hours reading messages from fellow space travelers for a fun and engaging experience.

**Highlights:** Intergalactic letter writing, Connect with global users, Read messages from pen pals, Unique communication experience, Hours of engaging content

**Features:** macOS Compatibility

**In-app purchases:** none


### XenoSignal

[App page](https://appshunter.io/ios/app/xenosignal-alien-comm-and-wiki/id6749178646)

Explore a comprehensive encyclopedia of extraterrestrial life and knowledge. This sci-fi inspired app offers detailed alien profiles, field notes, and an immersive interface, all accessible offline.

**Highlights:** Detailed alien profiles, Classified research log format, Offline access, Immersive futuristic interface, Interactive mission control elements

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Recharge Battery | $0.99 | one-time |
| Gain Signal | $0.99 | one-time |
| Donate to the Developer | $0.99 | one-time |
| Remove Ads | $7.99 | one-time |


## Frequently asked questions

### Is Space Letters free?

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

### Is XenoSignal free?

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

### Which has better reviews, Space Letters or XenoSignal?

Space Letters and XenoSignal are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do Space Letters or XenoSignal have ads?

Both Space Letters and XenoSignal show ads.

### Which is updated more often, Space Letters or XenoSignal?

Space Letters ships an update daily, and XenoSignal every 3 months. Most recently, Space Letters was updated on November 4, 2026 and XenoSignal on October 30, 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.*