# Open Book vs Clear Days

The clearest difference is in-app purchases: Clear Days at none against Open Book's 2. Clear Days also leads on iOS requirement (15.0 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Open Book sells 2 in-app purchases, starting at $9.99 per month. Clear Days asks for nothing beyond the download.

Open Book ships an update every 3 days, Clear Days every 4 days. Both last shipped on October 29, 2026.

## The numbers

| Metric | Open Book | Clear Days |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (10 ratings)](https://appshunter.io/ios/app/clear-days-quit-tracker/id6816768631/reviews)** |
| Number of ratings | — | **10** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 4 days |
| Monetization | — | Free |
| Size | 10 MB | 2 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Reno Labs, LLC](https://appshunter.io/developer/1860024715) | [Elise Swopes](https://appshunter.io/developer/6816768634) |

## What reviewers say

### Open Book

[App page](https://appshunter.io/ios/app/open-book-content-blocker/id6792210520)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Open Book Monthly | $9.99 | per month |
| Open Book Annual | $59.99 | per year |


### Clear Days

[App page](https://appshunter.io/ios/app/clear-days-quit-tracker/id6816768631)

Track your progress in quitting habits with customizable cards. See your days, months, and years free, with milestone alerts and a progress line. Works offline and is designed for privacy with no ads or tracking.

**Highlights:** Customizable habit cards, Clear day counts, Milestone alerts, Progress line visualization, Light and dark mode, Offline functionality, Private by design

**In-app purchases:** none


## Frequently asked questions

### Is Open Book free?

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

### Is Clear Days free?

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

### Do Open Book or Clear Days have ads?

Neither Open Book nor Clear Days shows ads.

### Which is updated more often, Open Book or Clear Days?

Open Book ships an update every 3 days, and Clear Days every 4 days. Most recently, Open Book was updated on October 29, 2026 and Clear Days on October 29, 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.*