# Black Clock vs Math Alarm Clock by Mathy

The clearest difference is price: Math Alarm Clock by Mathy at Free against Black Clock's $4.99. Math Alarm Clock by Mathy also leads on update cadence (every 8 days vs every 9 months) and review sentiment (74% vs 57%). Black Clock's advantage is in-app purchases (none vs 12) and iOS requirement (13.0 vs 15.6). On ads and device support there is nothing between them.

Math Alarm Clock by Mathy is free to download; Black Clock costs $4.99 up front. Math Alarm Clock by Mathy sells 12 in-app purchases, starting at $0.99 per month. Black Clock asks for nothing beyond the download.

Black Clock ships an update every 9 months, Math Alarm Clock by Mathy every 8 days. The most recent releases landed on October 12, 2026 and October 22, 2026 respectively.

## The numbers

| Metric | Black Clock | Math Alarm Clock by Mathy |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[4.4 (111 ratings)](https://appshunter.io/ios/app/math-alarm-clock-by-mathy/id1419685308/reviews)** |
| Number of ratings | — | **111** |
| Positive reviews | 57.1% of reviews | **73.7% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 8 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 0 MB | 67 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [MacMedia](https://appshunter.io/developer/322441361) | [Infinite Wave Media, LLC](https://appshunter.io/developer/495187294) |

## What reviewers say

### Black Clock

[App page](https://appshunter.io/ios/app/black-clock/id335519165)

A straightforward analog clock application offering a clean and simple design. It displays time with classic hands on a dial, providing an uncluttered visual experience for users who prefer traditional timekeeping.

**Highlights:** Simple design, Clean interface, Analog display, Classic clock hands

**Features:** Vision Pro support

**In-app purchases:** none


### Math Alarm Clock by Mathy

[App page](https://appshunter.io/ios/app/math-alarm-clock-by-mathy/id1419685308)

This app requires users to solve math problems to turn off their alarms, ensuring a more effective wake-up experience. It offers customizable alarm settings, including difficulty levels, music choices, and snooze intervals. The app also features a nightstand clock display and adjustable screen brightness.

**Highlights:** Solve math problems to stop alarms, Adjustable math difficulty levels, Customizable alarm sounds and music, Repeating alarm options, Nightstand clock display, Customizable snooze intervals

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

**In-app purchases (12)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Math Alarm Clock Pro by Mathy | $0.99 | per month |
| Mathy Pro Annual | $9.99 | per year |
| Car Alarm Xtrm | $0.99 | one-time |
| Progressive | $0.99 | one-time |
| Rain On Metal | $0.99 | one-time |
| Retro | $0.99 | one-time |
| Rooster Call | $0.99 | one-time |
| Scream | $0.99 | one-time |
| Sound Grenade | $0.99 | one-time |
| White Noise | $0.99 | one-time |
| All Sounds | $3.99 | one-time |
| Lifetime | $29.99 | one-time |

**What reviewers like**

- 👍 Effective at waking users up
- 💡 Math problems to disable alarm
- 👍 Simple and easy to use
- 👍 Helpful for getting ready
- 👍 Reliable for not being late

**What reviewers complain about**

- 🐛 Alarms turn themselves off
- 🔒 Features locked behind subscription
- 🐛 Does not work in Do Not Disturb mode
- 🔋 Requires phone to be on all night
- 🔊 Alarm sound is too loud

**Reported bugs**

- Alarms turn themselves off
- Alarms do not stay on
- Alarms do not go off
- App doesn't load
- Math difficulty setting is ignored

**Requested features**

- More variety in math equations
- Allow alarms to work in Do Not Disturb mode
- Allow alarms to work without the app being constantly on
- Adjust alarm volume


## Frequently asked questions

### Is Black Clock free?

Black Clock costs $4.99, with no in-app purchases.

### Is Math Alarm Clock by Mathy free?

Math Alarm Clock by Mathy is free to download, with in-app purchases available.

### Do Black Clock or Math Alarm Clock by Mathy have ads?

Neither Black Clock nor Math Alarm Clock by Mathy shows ads.

### Which is updated more often, Black Clock or Math Alarm Clock by Mathy?

Black Clock ships an update every 9 months, and Math Alarm Clock by Mathy every 8 days. Most recently, Black Clock was updated on October 12, 2026 and Math Alarm Clock by Mathy on October 22, 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.*