# Binary Clock vs Sundown

The clearest difference is in-app purchases: Binary Clock at none against Sundown's 1. Sundown's advantage is update cadence (every 4 weeks vs every 12 months). On price, ads, device support and iOS requirement there is nothing between them.

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

Binary Clock ships an update every 12 months, Sundown every 4 weeks. The most recent releases landed on September 30, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Binary Clock | Sundown |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (8 ratings)](https://appshunter.io/ios/app/sundown-sunrisesunset-alerts/id6711351809/reviews)** |
| Number of ratings | — | **8** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 0 MB | 32 MB |
| Requires iOS | **17.2** | 18.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Sayan Goswami](https://appshunter.io/developer/1724985919) | [Recursive Ink Ltd](https://appshunter.io/developer/1770059606) |

## What reviewers say

### Binary Clock

[App page](https://appshunter.io/ios/app/binary-clock-view-time-in-bcd/id6475730187)

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

**In-app purchases:** none


### Sundown

[App page](https://appshunter.io/ios/app/sundown-sunrisesunset-alerts/id6711351809)

Plan your daily activities and events around natural daylight cycles. Set alarms and reminders linked to sunrise and sunset times, perfect for outdoor activities, photography, or daily routines. Get accurate solar timings for thousands of locations worldwide.

**Highlights:** Sunrise/sunset time alerts, Event scheduling linked to solar cycles, Customizable timeline, Future date planning, Data for 57,000+ locations, Offline functionality, Yearly summary charts

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Sundown Gold | $5.99 | one-time |


## Frequently asked questions

### Is Binary Clock free?

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

### Is Sundown free?

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

### Do Binary Clock or Sundown have ads?

Neither Binary Clock nor Sundown shows ads.

### Which is updated more often, Binary Clock or Sundown?

Binary Clock ships an update every 12 months, and Sundown every 4 weeks. Most recently, Binary Clock was updated on September 30, 2026 and Sundown on September 21, 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.*