# SkyLetter vs Space Particles

The clearest difference is in-app purchases: SkyLetter at none against Space Particles's 1. SkyLetter also leads on iOS requirement (12.0 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Space Particles sells 1 one-off in-app purchase. SkyLetter asks for nothing beyond the download.

SkyLetter ships an update fortnightly, Space Particles every 8 days. The most recent releases landed on October 23, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | SkyLetter | Space Particles |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[1.0 (1 ratings)](https://appshunter.io/ios/app/skyletter/id1469768088/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 25.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 8 days** |
| Monetization | Free | — |
| Size | 45 MB | 7 MB |
| Requires iOS | **12.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kiyotaka Watanabe](https://appshunter.io/developer/1408976233) | [Brandon Schabel](https://appshunter.io/developer/1862025955) |

## What reviewers say

### SkyLetter

[App page](https://appshunter.io/ios/app/skyletter/id1469768088)

Create personalized messages drawn in the sky with airplane contrails. Share your creations as videos or photos on social media, perfect for sending unique greetings or declarations.

**Highlights:** Draw messages in the sky with contrails, Share creations as video or photo, Personalize messages for friends, Unique social media content

**Features:** macOS Compatibility

**In-app purchases:** none


### Space Particles

[App page](https://appshunter.io/ios/app/space-particles/id6775682716)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Space Particles Pro | $2.99 | one-time |


## Frequently asked questions

### Is SkyLetter free?

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

### Is Space Particles free?

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

### Do SkyLetter or Space Particles have ads?

Neither SkyLetter nor Space Particles shows ads.

### Which is updated more often, SkyLetter or Space Particles?

SkyLetter ships an update fortnightly, and Space Particles every 8 days. Most recently, SkyLetter was updated on October 23, 2026 and Space Particles on October 17, 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.*