# Arc vs Winterlock

The clearest difference is in-app purchases: Winterlock at none against Arc's 1. Winterlock also leads on update cadence (every 3 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. Winterlock asks for nothing beyond the download.

Arc ships an update every 9 days, Winterlock every 3 days. Both last shipped on September 20, 2026.

## The numbers

| Metric | Arc | Winterlock |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 9 days | **Every 3 days** |
| Size | 18 MB | 35 MB |
| Requires iOS | 17.0 | **16.4** |
| Devices | **iPhone, Apple Watch** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [岚烜 吴](https://appshunter.io/developer/6788589687) | [GCL Tech](https://appshunter.io/developer/1784049183) |

## 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 |


### Winterlock

[App page](https://appshunter.io/ios/app/winterlock-winter-arc-tracker/id6807602638)

**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 Winterlock free?

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

### Do Arc or Winterlock have ads?

Winterlock shows ads; Arc does not.

### Which is updated more often, Arc or Winterlock?

Arc ships an update every 9 days, and Winterlock every 3 days. Most recently, Arc was updated on September 20, 2026 and Winterlock on September 20, 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.*