# big O'Clock vs Sleep Vibrations

The clearest difference is in-app purchases: Sleep Vibrations at none against big O'Clock's 3. Sleep Vibrations also leads on rating (5.0 vs 4.5) and update cadence (every 2 months vs every 12 months). big O'Clock's advantage is ratings volume (11 vs 1). On price, ads, monetization model and device support there is nothing between them.

big O'Clock costs $0.99 and Sleep Vibrations $0.99 up front. big O'Clock sells 3 one-off in-app purchases. Sleep Vibrations asks for nothing beyond the download.

Sleep Vibrations holds the better App Store score, 5.0 against 4.5. That said, the two scores are not equally well evidenced: big O'Clock has 11 ratings behind it against 1, so its average is the more settled of the two.

big O'Clock ships an update every 12 months, Sleep Vibrations every 2 months. The most recent releases landed on November 3, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | big O'Clock | Sleep Vibrations |
| --- | --- | --- |
| Price | $0.99 | $0.99 |
| Rating | [4.5 (11 ratings)](https://appshunter.io/ios/app/big-oclock/id1524090504/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/sleep-vibrations/id6754226600/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Best chart rank | — | **#61** |
| Size | 31 MB | 4 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [john bogaert](https://appshunter.io/developer/1524090506) | [Ian Akio Melo Shimabukuro](https://appshunter.io/developer/1817883998) |

## What reviewers say

### big O'Clock

[App page](https://appshunter.io/ios/app/big-oclock/id1524090504)

A full-screen clock, timer, and stopwatch app featuring large, clear digits. It offers high-quality visuals, sounds, and vibrations, serving as a stylish nightstand or work clock.

**Highlights:** Full-screen display, Large, clear digits, Customizable sounds and vibrations, Timer functionality, Stopwatch functionality, Nightstand mode

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| I Love Big O'Clock | $1.99 | one-time |
| I Deeply Love Big O'Clock | $3.99 | one-time |
| I Adore Big O'Clock | $6.99 | one-time |


### Sleep Vibrations

[App page](https://appshunter.io/ios/app/sleep-vibrations/id6754226600)

**Currently charting:** #61 Top Paid · Lifestyle (US App Store)

This Apple Watch app uses gentle, rhythmic vibrations to help you relax and fall asleep faster. It provides a silent, tactile anchor for your attention, guiding you away from racing thoughts without disturbing others or requiring headphones.

**Highlights:** Adjustable vibration timer, Customizable vibration speed and style, Pitch black, minimalist interface, Completely silent, haptic-only operation, Standalone Apple Watch functionality, Battery efficient design

**Features:** Apple Watch app

**In-app purchases:** none


## Frequently asked questions

### Is big O'Clock free?

big O'Clock costs $0.99, and also offers in-app purchases.

### Is Sleep Vibrations free?

Sleep Vibrations costs $0.99, with no in-app purchases.

### Which has better reviews, big O'Clock or Sleep Vibrations?

Sleep Vibrations is rated higher. big O'Clock averages 4.5 out of 5 from 11 ratings, while Sleep Vibrations averages 5.0 from 1 ratings.

### Do big O'Clock or Sleep Vibrations have ads?

Neither big O'Clock nor Sleep Vibrations shows ads.

### Which is updated more often, big O'Clock or Sleep Vibrations?

big O'Clock ships an update every 12 months, and Sleep Vibrations every 2 months. Most recently, big O'Clock was updated on November 3, 2026 and Sleep Vibrations on November 5, 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.*