# WriteBack vs postin

The clearest difference is in-app purchases: WriteBack at none against postin's 3. WriteBack also leads on iOS requirement (13.0 vs 26.0). postin's advantage is update cadence (every 2 days vs every 5 days). On price, ads and device support there is nothing between them.

Both are free to download. postin sells 3 in-app purchases, starting at $1.99 per month. WriteBack asks for nothing beyond the download.

WriteBack ships an update every 5 days, postin every 2 days. The most recent releases landed on September 25, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | WriteBack | postin |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 days | **Every 2 days** |
| Size | 18 MB | 47 MB |
| Requires iOS | **13.0** | 26.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Markovate](https://appshunter.io/developer/1605748573) | [keishi yokoi](https://appshunter.io/developer/1861661371) |

## What reviewers say

### WriteBack

[App page](https://appshunter.io/ios/app/writeback/id1605748571)

**Features:** macOS Compatibility

**In-app purchases:** none


### postin

[App page](https://appshunter.io/ios/app/postin-postcard-sns/id6794994524)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Subscription Plan (Monthly) | $1.99 | per month |
| Annual Subscription | $19.99 | per year |
| 5 Stamps | $0.29 | one-time |


## Frequently asked questions

### Is WriteBack free?

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

### Is postin free?

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

### Do WriteBack or postin have ads?

Neither WriteBack nor postin shows ads.

### Which is updated more often, WriteBack or postin?

WriteBack ships an update every 5 days, and postin every 2 days. Most recently, WriteBack was updated on September 25, 2026 and postin on September 29, 2026.

---

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