# Arc vs Three Things Gratitude

The clearest difference is in-app purchases: Three Things Gratitude at none against Arc's 1. Three Things Gratitude also leads on update cadence (every 4 days vs every 9 days). Arc's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Arc sells 1 one-off in-app purchase. Three Things Gratitude asks for nothing beyond the download.

Arc ships an update every 9 days, Three Things Gratitude every 4 days. The most recent releases landed on October 7, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | Arc | Three Things Gratitude |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | **Every 4 days** |
| Size | 18 MB | 19 MB |
| Requires iOS | 17.0 | 17.0 |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [岚烜 吴](https://appshunter.io/developer/6788589687) | [DAVID VILCHEZ SANCHEZ](https://appshunter.io/developer/6807029565) |

## What reviewers say

### Arc

[App page](https://appshunter.io/ios/app/arc-75-day-challenge-tracker/id6796747380)

**Features:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Arc Pro | $6.99 | one-time |


### Three Things Gratitude

[App page](https://appshunter.io/ios/app/three-things-gratitude/id6809416345)

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

**In-app purchases:** none


## Frequently asked questions

### Is Arc free?

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

### Is Three Things Gratitude free?

Three Things Gratitude is free to download, with no in-app purchases.

### Do Arc or Three Things Gratitude have ads?

Three Things Gratitude shows ads; Arc does not.

### Which is updated more often, Arc or Three Things Gratitude?

Arc ships an update every 9 days, and Three Things Gratitude every 4 days. Most recently, Arc was updated on October 7, 2026 and Three Things Gratitude on September 30, 2026.

---

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