# Biotronix vs Big Clock

The clearest difference is in-app purchases: Biotronix at none against Big Clock's 7. Biotronix also leads on iOS requirement (13.0 vs 16.0). Big Clock's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. Big Clock sells 7 one-off in-app purchases. Biotronix asks for nothing beyond the download.

Biotronix ships an update monthly, Big Clock weekly. The most recent releases landed on October 18, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Biotronix | Big Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.7 (6 ratings)](https://appshunter.io/ios/app/big-clock-always-on-display/id6760553772/reviews)** |
| Number of ratings | — | **6** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | — | Free with in-app purchases |
| Size | 30 MB | 74 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Litespeed AG](https://appshunter.io/developer/1751562990) | [Nataliia Zarudna](https://appshunter.io/developer/1871489027) |

## What reviewers say

### Biotronix

[App page](https://appshunter.io/ios/app/biotronix/id6504259124)

**Features:** macOS Compatibility

**In-app purchases:** none


### Big Clock

[App page](https://appshunter.io/ios/app/big-clock-always-on-display/id6760553772)

Transform your device into a large, clear digital clock. Ideal for bedside tables, desks, or workouts, it offers an always-on display with customizable themes and brightness for easy readability in any environment.

**Highlights:** Fullscreen digital clock, Always-on display mode, Light and dark themes, Brightness control, Portrait and landscape support, Minimal design

**Features:** Vision Pro support

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Coffee Support | $1.99 | one-time |
| Premium | $2.99 | one-time |
| Premium + Coffee | $4.99 | one-time |
| Coffee & Croissant Support | $5.99 | one-time |
| Premium + Coffee + Croissant | $8.99 | one-time |
| Big Support | $12.99 | one-time |
| Premium + Big Support | $14.99 | one-time |


## Frequently asked questions

### Is Biotronix free?

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

### Is Big Clock free?

Big Clock is free to download, with in-app purchases available.

### Do Biotronix or Big Clock have ads?

Neither Biotronix nor Big Clock shows ads.

### Which is updated more often, Biotronix or Big Clock?

Biotronix ships an update monthly, and Big Clock weekly. Most recently, Biotronix was updated on October 18, 2026 and Big Clock on October 24, 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.*