# SkyPost vs OnceChat

The clearest difference is in-app purchases: OnceChat at none against SkyPost's 2. OnceChat also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. SkyPost sells 2 in-app purchases, starting at $1.99 per month. OnceChat asks for nothing beyond the download.

SkyPost ships an update every 8 days, OnceChat every 2 weeks. The most recent releases landed on October 10, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | SkyPost | OnceChat |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 2 weeks |
| Size | 21 MB | 37 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [Jong Min Deng](https://appshunter.io/developer/601390889) | [Kosei Takanashi](https://appshunter.io/developer/6777430042) |

## What reviewers say

### SkyPost

[App page](https://appshunter.io/ios/app/skypost-message-in-a-bottle/id6761697699)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $1.99 | per month |
| Annual | $4.99 | per year |


### OnceChat

[App page](https://appshunter.io/ios/app/oncechat/id6777430040)

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

**In-app purchases:** none


## Frequently asked questions

### Is SkyPost free?

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

### Is OnceChat free?

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

### Do SkyPost or OnceChat have ads?

Neither SkyPost nor OnceChat shows ads.

### Which is updated more often, SkyPost or OnceChat?

SkyPost ships an update every 8 days, and OnceChat every 2 weeks. Most recently, SkyPost was updated on October 10, 2026 and OnceChat on October 6, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*