# ADClock Blackboard vs Amaze Clock

The clearest difference is in-app purchases: ADClock Blackboard at none against Amaze Clock's 1. ADClock Blackboard also leads on iOS requirement (6.0 vs 16.0). Amaze Clock's advantage is update cadence (every 2 weeks vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Amaze Clock sells 1 one-off in-app purchase. ADClock Blackboard asks for nothing beyond the download.

ADClock Blackboard ships an update every 10 months, Amaze Clock every 2 weeks. The most recent releases landed on October 6, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ADClock Blackboard | Amaze Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/adclock-blackboard/id574832850/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 28 MB | 52 MB |
| Requires iOS | **6.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hiroyuki Otsuka](https://appshunter.io/developer/554117199) | [文长 侯](https://appshunter.io/developer/1197107833) |

## What reviewers say

### ADClock Blackboard

[App page](https://appshunter.io/ios/app/adclock-blackboard/id574832850)

This utility app displays analog and digital clocks with a unique "Blackboard" design theme. It offers customizable display formats, date indications, and orientation mirroring. Users can also control time signal voice sounds and auto-lock settings.

**Highlights:** Analog and digital clock display, Blackboard design theme, 12/24-hour format switch, Date indication (EN, JP, KR), Auto lock ON/OFF, Horizontal/vertical inversion, Time signal voice sound

**Features:** macOS Compatibility

**In-app purchases:** none


### Amaze Clock

[App page](https://appshunter.io/ios/app/amaze-clock/id6476312577)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身解锁全部时钟 | $0.99 | one-time |


## Frequently asked questions

### Is ADClock Blackboard free?

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

### Is Amaze Clock free?

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

### Do ADClock Blackboard or Amaze Clock have ads?

Neither ADClock Blackboard nor Amaze Clock shows ads.

### Which is updated more often, ADClock Blackboard or Amaze Clock?

ADClock Blackboard ships an update every 10 months, and Amaze Clock every 2 weeks. Most recently, ADClock Blackboard was updated on October 6, 2026 and Amaze Clock on October 12, 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.*