# Big binary clock vs CDAY

The clearest difference is price: CDAY at Free against Big binary clock's $0.99. CDAY also leads on review sentiment (88% vs 50%) and update cadence (monthly vs every 13 months). Big binary clock's advantage is in-app purchases (none vs 1) and ratings volume (5 vs 1). On ads and device support there is nothing between them.

CDAY is free to download; Big binary clock costs $0.99 up front. CDAY sells 1 one-off in-app purchase. Big binary clock asks for nothing beyond the download.

CDAY holds the better App Store score, 5.0 against 4.6. That said, the two scores are not equally well evidenced: Big binary clock has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Big binary clock's written reviews are positive against 88% of CDAY's.

Big binary clock ships an update every 13 months, CDAY monthly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Big binary clock | CDAY |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [4.6 (5 ratings)](https://appshunter.io/ios/app/big-binary-clock/id572188132/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/cday-birthday-and-anniversary/id6464173441/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 50.0% of reviews | **88.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 13 months | **Monthly** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 2 MB | 56 MB |
| Requires iOS | **14.4** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Alexander Rutkowskij](https://appshunter.io/developer/518370415) | [仲辉 黄](https://appshunter.io/developer/1687783590) |

## What reviewers say

### Big binary clock

[App page](https://appshunter.io/ios/app/big-binary-clock/id572188132)

This app displays the current time using binary code. Customize the appearance with different LED shapes, colors, and brightness levels. It offers a unique way to view time for tech enthusiasts.

**Highlights:** Binary time display, Round LED option, Square LED option, Geek mode, Customizable colors, Adjustable brightness

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

**In-app purchases:** none


### CDAY

[App page](https://appshunter.io/ios/app/cday-birthday-and-anniversary/id6464173441)

This app helps you remember important dates with a charming cartoon countdown interface. Add widgets to your home screen to see upcoming events like birthdays, anniversaries, and trips at a glance. Make waiting for special days feel more joyful and organized.

**Highlights:** Cartoon-style countdowns, Anniversary Time Machine, Future date countdowns, Flexible recurring reminders, Stylish customizable cards, Home screen widgets, Widget label filters

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full version | $2.99 | one-time |


## Frequently asked questions

### Is Big binary clock free?

Big binary clock costs $0.99, with no in-app purchases.

### Is CDAY free?

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

### Which has better reviews, Big binary clock or CDAY?

CDAY is rated higher. Big binary clock averages 4.6 out of 5 from 5 ratings, while CDAY averages 5.0 from 1 ratings.

### Do Big binary clock or CDAY have ads?

Neither Big binary clock nor CDAY shows ads.

### Which is updated more often, Big binary clock or CDAY?

Big binary clock ships an update every 13 months, and CDAY monthly. Most recently, Big binary clock was updated on November 1, 2026 and CDAY on November 4, 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.*