# ROT13 Decoder vs StampWorth

The clearest difference is update cadence: StampWorth at every 2 days against ROT13 Decoder's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

ROT13 Decoder ships an update every 8 months, StampWorth every 2 days. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | ROT13 Decoder | StampWorth |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[2.0 (1 ratings)](https://appshunter.io/ios/app/stampworth-stamp-value/id6795797141/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 days** |
| Monetization | — | Freemium |
| Size | 16 MB | 32 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [佳伟 蔡](https://appshunter.io/developer/1801859662) | [Tung Tran Thanh](https://appshunter.io/developer/6795797143) |

## What reviewers say

### ROT13 Decoder

[App page](https://appshunter.io/ios/app/rot13-decoder/id6743629613)

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

**In-app purchases:** none


### StampWorth

[App page](https://appshunter.io/ios/app/stampworth-stamp-value/id6795797141)

Instantly appraise the value of your stamps using AI. Snap a photo to identify stamps, estimate market value, and check live eBay prices. Track your collection's worth over time.

**Highlights:** AI-powered stamp identification, Estimated market value, Live eBay price checks, Condition and rarity grading, Scan full album pages (Pro), Track collection worth, Manual stamp logging

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

**In-app purchases:** none


## Frequently asked questions

### Is ROT13 Decoder free?

ROT13 Decoder is free to download, with no in-app purchases.

### Is StampWorth free?

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

### Do ROT13 Decoder or StampWorth have ads?

Neither ROT13 Decoder nor StampWorth shows ads.

### Which is updated more often, ROT13 Decoder or StampWorth?

ROT13 Decoder ships an update every 8 months, and StampWorth every 2 days. Most recently, ROT13 Decoder was updated on October 13, 2026 and StampWorth on October 14, 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.*