# Sci vs BTTF Clock

The clearest difference is rating: BTTF Clock at 4.6 against Sci's 3.9. BTTF Clock also leads on ads (none vs shown) and review sentiment (84% vs 54%). On price, ratings volume and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

BTTF Clock holds the better App Store score, 4.6 against 3.9. Both are backed by a comparable volume of ratings — 14 and 31 respectively. Written reviews point the same way: 54% of Sci's written reviews are positive against 84% of BTTF Clock's.

Sci ships an update every 4 months, BTTF Clock every 5 weeks. The most recent releases landed on October 30, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Sci | BTTF Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.9 (14 ratings)](https://appshunter.io/ios/app/sci-fi-sounds-and-noises/id477955120/reviews) | **[4.6 (31 ratings)](https://appshunter.io/ios/app/bttf-clock/id6740161583/reviews)** |
| Number of ratings | 14 | **31** |
| Positive reviews | 53.6% of reviews | **84.0% of reviews** |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 15 MB | 89 MB |
| Requires iOS | 18 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 9+ | 4+ |
| Developer | [iGreenEarth](https://appshunter.io/developer/351081815) | [Sergei Bazarnik](https://appshunter.io/developer/1722100966) |

## What reviewers say

### Sci

[App page](https://appshunter.io/ios/app/sci-fi-sounds-and-noises/id477955120)

Explore a universe of over 50 unique science fiction sound effects. This app offers a diverse collection of interstellar noises, from alien calls and laser blasts to spaceship engines and robotic chatter.

**Highlights:** Over 50 sci-fi sound effects, Alien sounds, Laser sounds, Spaceship sounds, Robot sounds, Weapon sounds, Mood music

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

**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, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Sci free?

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

### Is BTTF Clock free?

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

### Which has better reviews, Sci or BTTF Clock?

BTTF Clock is rated higher. Sci averages 3.9 out of 5 from 14 ratings, while BTTF Clock averages 4.6 from 31 ratings.

### Do Sci or BTTF Clock have ads?

Sci shows ads; BTTF Clock does not.

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

Sci ships an update every 4 months, and BTTF Clock every 5 weeks. Most recently, Sci was updated on October 30, 2026 and BTTF Clock on October 25, 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.*