# Cla vs BTTF Clock

The clearest difference is price: BTTF Clock at Free against Cla's $0.99. Cla's advantage is update cadence (every 4 days vs every 6 weeks) and iOS requirement (13.0 vs 15.6). On ads, in-app purchases and device support there is nothing between them.

BTTF Clock is free to download; Cla costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Cla ships an update every 4 days, BTTF Clock every 6 weeks. The most recent releases landed on October 3, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Cla | BTTF Clock |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | — | **[4.6 (31 ratings)](https://appshunter.io/ios/app/bttf-clock/id6740161583/reviews)** |
| Number of ratings | — | **31** |
| Positive reviews | — | 84.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 6 weeks |
| Monetization | — | Free |
| Size | 150 MB | 75 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHINSUKE ISHIDA](https://appshunter.io/developer/1747849427) | [Sergei Bazarnik](https://appshunter.io/developer/1722100966) |

## What reviewers say

### Cla

[App page](https://appshunter.io/ios/app/cla-gene/id6503036121)

**Features:** macOS Compatibility

**In-app purchases:** none


### BTTF Clock

[App page](https://appshunter.io/ios/app/bttf-clock/id6740161583)

Experience the magic of time travel with a digital recreation of the iconic DeLorean dashboard. This app features customizable date panels, real-time clock updates, and authentic sound effects from the "Back to the Future" trilogy. It's designed to run smoothly on older devices, bringing cinematic nostalgia to your phone or tablet.

**Highlights:** Iconic time display panels, Customizable destination, present, and last departed times, Real-time accurate clock, Interactive interface for date changes, Authentic movie sound effects, Optimized for older devices

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

**In-app purchases:** none


## Frequently asked questions

### Is Cla free?

Cla costs $0.99, with no in-app purchases.

### Is BTTF Clock free?

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

### Do Cla or BTTF Clock have ads?

Neither Cla nor BTTF Clock shows ads.

### Which is updated more often, Cla or BTTF Clock?

Cla ships an update every 4 days, and BTTF Clock every 6 weeks. Most recently, Cla was updated on October 3, 2026 and BTTF Clock on October 17, 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.*