# 履約 vs DotTrail

The clearest difference is ads: 履約 at none against DotTrail's shown. DotTrail's advantage is update cadence (daily vs every 3 days). On price, in-app purchases, device support and iOS requirement there is nothing between them.

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

履約 ships an update every 3 days, DotTrail daily. Both last shipped on October 16, 2026.

## The numbers

| Metric | 履約 | DotTrail |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 days | **Daily** |
| Size | 7 MB | 7 MB |
| Requires iOS | 18.2 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [CHEN YU CHEN](https://appshunter.io/developer/1857924378) | [SHU-CHIH LIN](https://appshunter.io/developer/6809671847) |

## What reviewers say

### 履約

[App page](https://appshunter.io/ios/app/cooperation/id6756006577)

**In-app purchases:** none


### DotTrail

[App page](https://appshunter.io/ios/app/dottrail/id6809820649)

**In-app purchases:** none


## Frequently asked questions

### Is 履約 free?

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

### Is DotTrail free?

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

### Do 履約 or DotTrail have ads?

DotTrail shows ads; 履約 does not.

### Which is updated more often, 履約 or DotTrail?

履約 ships an update every 3 days, and DotTrail daily. Most recently, 履約 was updated on October 16, 2026 and DotTrail on October 16, 2026.

---

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