# Primal Fast vs Winter Arc

The clearest difference is ads: Primal Fast at none against Winter Arc's shown. Primal Fast also leads on iOS requirement (15.1 vs 17.0). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Primal Fast sells 2 in-app purchases, starting at $6.99 per month and Winter Arc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Both ship on a similar rhythm, roughly every 8 days. The most recent releases landed on October 28, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Primal Fast | Winter Arc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.5 (6 ratings)](https://appshunter.io/ios/app/winter-arc-90-days-challenge/id6801043027/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 60.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 8 days | Every 8 days |
| Monetization | — | Free with in-app purchases |
| Size | 43 MB | 14 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [SERGEI JELUASVILI](https://appshunter.io/developer/1896539644) | [Ikuhei Kure](https://appshunter.io/developer/1837581334) |

## What reviewers say

### Primal Fast

[App page](https://appshunter.io/ios/app/primal-fast-carnivore-timer/id6780590381)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Primal Fast Pro — Monthly | $6.99 | per month |
| Primal Fast Pro — Annual | $34.99 | per year |


### Winter Arc

[App page](https://appshunter.io/ios/app/winter-arc-90-days-challenge/id6801043027)

This app helps you build habits over 90 days by setting daily rules and tracking your progress. It offers flexibility with grace days and rescue options, and visualizes your journey with a heatmap and journal. Share your achievements and stay motivated with widgets and reminders.

**Highlights:** Set daily rules and sign a contract, Flexible streak tracking with grace days, 90-square heatmap progress visualization, Private journal with photo entries, Shareable progress cards, Home and lock screen widgets, Unlimited arcs with one-time upgrade

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Winter Arc - Premium | $9.99 | one-time |


## Frequently asked questions

### Is Primal Fast free?

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

### Is Winter Arc free?

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

### Do Primal Fast or Winter Arc have ads?

Winter Arc shows ads; Primal Fast does not.

### Which is updated more often, Primal Fast or Winter Arc?

Primal Fast ships an update every 8 days, and Winter Arc every 8 days. Most recently, Primal Fast was updated on October 28, 2026 and Winter Arc on October 31, 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.*