Cla vs BTTF Clock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Cla
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This app encourages anyone to easily enjoy composing and experimenting with minimal music played by two people clapping their hands. Abbreviating "Clapping Music Generator", that's "Cla-Gene!". You can of course try changing the tempo and number of times the basic rhythm is used, but even using simple rhythms that you're familiar with may lead to wonderful encounters. A free version (with limited functionality), "Cla-Gene! Trial Edition" is also available in the store.
BTTF Clock
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.
- 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
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Relive the magic of time travel with the BTTF Clock! Inspired by the iconic clock from the "Back to the Future" trilogy, this app brings the excitement of the DeLorean's dashboard right to your device. Whether you're using a phone or tablet you can enjoy the nostalgia of the iconic time machine. Best of all, it's optimized to run smoothly even on outdated devices, so no one gets left behind in the past. Key Features: • Iconic Time Display: Experience the legendary "Destination Time," "Present Time," and "Last Time Departed" panels, faithfully recreated with stunning detail. • Customizable Dates: Set your own dates for each panel and watch as the app mimics the flux capacitor's data changes. • Real-time Clock: Always stay on schedule with the accurate present time display. • Interactive Interface: Tap on the clock panels to change dates and relive the thrill of setting your time travel destination. • Sound Effects: Enjoy authentic sound effects from the movie to enhance your time travel experience. • Car Mode: Combine the Time Circuits, flux capacitor, and GPS speedometer in an immersive dashboard. • Manual Speed Simulation: Press and hold the speedometer to accelerate and feel speed-responsive haptic feedback as you approach the selected time-travel speed. • Cinematic Time Travel: Reach the configured speed to trigger a full-screen time-travel sequence with visual transitions and sound effects. • Home Screen and CarPlay Widget: Keep the Time Circuits visible at a glance with a configurable widget for your Home Screen and CarPlay. • Optimized for Outdated Devices: Designed to run efficiently on older devices, ensuring smooth performance without compromising on features. Target Audience: • Fans of the "Back to the Future" trilogy. • Retro and classic movie enthusiasts. • Anyone who enjoys unique and themed timekeeping apps. • Users with older devices seeking fun and functional apps.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Cla | BTTF Clock |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | — | 4.6 (31 ratings) — better |
| Positive reviews | — | 84.0% of reviews |
| Number of ratings | — | 31 — better |
| Update frequency | Every 4 days — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 13.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 150 MB | 75 MB |
| Age rating | 4+ | 4+ |
| Developer | SHINSUKE ISHIDA | Sergei Bazarnik |
In-app purchases
Cla
No in-app purchases
BTTF Clock
No in-app purchases









