# Blue Light Filter vs Odd Lock

The clearest difference is price: Blue Light Filter at Free against Odd Lock's $4.99. Blue Light Filter also leads on ratings volume (137 vs 3) and iOS requirement (17.0 vs 26.5). Odd Lock's advantage is rating (5.0 vs 3.3) and in-app purchases (none vs 5). On update cadence, ads and device support there is nothing between them.

Blue Light Filter is free to download; Odd Lock costs $4.99 up front. Blue Light Filter sells 5 in-app purchases, starting at $4.99 per 7 days. Odd Lock asks for nothing beyond the download.

Odd Lock holds the better App Store score, 5.0 against 3.3. That said, the two scores are not equally well evidenced: Blue Light Filter has 137 ratings behind it against 3, so its average is the more settled of the two.

Blue Light Filter ships an update weekly, Odd Lock every 2 weeks. The most recent releases landed on October 17, 2026 and October 4, 2026 respectively.

## The numbers

| Metric | Blue Light Filter | Odd Lock |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | [3.3 (137 ratings)](https://appshunter.io/ios/app/blue-light-filter/id6463748819/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/odd-lock-app-blocker/id6762550956/reviews)** |
| Number of ratings | **137** | 3 |
| Positive reviews | 2.6% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 19 MB | 7 MB |
| Requires iOS | **17.0** | 26.5 |
| Devices | **iPhone, iPad, Mac** | iPhone, iPad |
| Age rating | 17+ | 4+ |
| Developer | [Rivia Corp s.r.o.](https://appshunter.io/developer/1698333588) | [Abstract Syntax LLC](https://appshunter.io/developer/1879479511) |

## What reviewers say

### Blue Light Filter

[App page](https://appshunter.io/ios/app/blue-light-filter/id6463748819)

Reduce eye strain and improve sleep with an adjustable blue light filter. Organize your files, photos, and videos with an integrated file manager. Enjoy a seamless web browsing experience with built-in filtering and bookmarking.

**Highlights:** Adjustable blue light filter, Eye strain relief, Improved sleep quality, Intuitive file manager, Zip/unzip support, Integrated web browser

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $4.99 | per 7 days |
| 1 month | $6.99 | per month |
| Blue Light Filter - Monthly | $7.99 | per month |
| 1 year | $24.99 | per year |
| Annually | $29.99 | per year |

**What reviewers complain about**

- 💸 Expensive subscription model
- 🚫 Blue light filter limited to app
- ⚠️ Difficult subscription cancellation
- 😠 App not free as expected
- ❌ Poor user interface

**Reported bugs**

- App doesn't open
- App keeps crashing
- App doesn't work on Mac
- Blank 'Trial Page' window
- Free cancellation not working

**Requested features**

- Automatically turn on at login
- Toggle on/off with shortcut key
- Apply blue light filter to entire phone
- More customization options


### Odd Lock

[App page](https://appshunter.io/ios/app/odd-lock-app-blocker/id6762550956)

This utility app helps you regain control over your device usage by restricting access to chosen applications. It requires completing a simple task, like speaking a phrase or walking, before apps become available for a set duration.

**Highlights:** App access restriction, Task-based unlocking, User-defined access periods, On-device processing, No account required, No personal data collection

**In-app purchases:** none


## Frequently asked questions

### Is Blue Light Filter free?

Blue Light Filter is free to download, with in-app purchases available.

### Is Odd Lock free?

Odd Lock costs $4.99, with no in-app purchases.

### Which has better reviews, Blue Light Filter or Odd Lock?

Odd Lock is rated higher. Blue Light Filter averages 3.3 out of 5 from 137 ratings, while Odd Lock averages 5.0 from 3 ratings.

### Do Blue Light Filter or Odd Lock have ads?

Neither Blue Light Filter nor Odd Lock shows ads.

### Which is updated more often, Blue Light Filter or Odd Lock?

Blue Light Filter ships an update weekly, and Odd Lock every 2 weeks. Most recently, Blue Light Filter was updated on October 17, 2026 and Odd Lock on October 4, 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.*