# RETHLock vs SeamSmart

The clearest difference is update cadence: SeamSmart at every 4 days against RETHLock's fortnightly. RETHLock's advantage is iOS requirement (13.0 vs 17.0). 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.

RETHLock ships an update fortnightly, SeamSmart every 4 days. The most recent releases landed on September 22, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | RETHLock | SeamSmart |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 4 days** |
| Size | 59 MB | 2 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [UEIHAUR ENTERPRISE CO.,LTD](https://appshunter.io/developer/1692135449) | [RWTH Aachen University](https://appshunter.io/developer/371466796) |

## What reviewers say

### RETHLock

[App page](https://appshunter.io/ios/app/rethlock/id6450167757)

**In-app purchases:** none


### SeamSmart

[App page](https://appshunter.io/ios/app/seamsmart/id6499210520)

**In-app purchases:** none


## Frequently asked questions

### Is RETHLock free?

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

### Is SeamSmart free?

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

### Do RETHLock or SeamSmart have ads?

Neither RETHLock nor SeamSmart shows ads.

### Which is updated more often, RETHLock or SeamSmart?

RETHLock ships an update fortnightly, and SeamSmart every 4 days. Most recently, RETHLock was updated on September 22, 2026 and SeamSmart on September 9, 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.*