Binary Clock vs Sundown
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Binary Clock
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A simple, flexible, customizable binary clock app that let's you see time in binary coded decimals.
Sundown
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.
- 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
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Sundown helps you plan your day in harmony with the sun. Whether you’re timing a sunset walk or organizing daily routines around natural light, Sundown makes scheduling effortless by linking your events to the sun’s daily cycle at your location. No more guesswork or mental arithmetic – just simple, intuitive planning aligned with the rhythm of the sun! • Set up an alarm clock linked to the local sunrise time. • Plan your runs, hikes, or walks to finish just before sunset. • Capture the perfect photo during the “golden hour” before sunset. • Set reminders for evening routines, like closing the garage door after dark. • Sync work tasks or outdoor projects with daylight hours. • Plan your mealtimes or sleep cycles around the sun. • Schedule stargazing activities based on astronomical twilight hours. • Never forget to walk the dog before dark – Sundown keeps you on track! Key features: • Get accurate times for sunrise, sunset, dawn, dusk, solar noon, and solar midnight, as well as nautical and astronomical variants. • Set recurring events tied to solar movements with just a few taps. • Customize your timeline to show only the events that matter to you. • Plan ahead by viewing your scheduled event times for future dates. • Data available for 57,000 locations around the world. • Or get precise timings for your exact location. • View summary charts and statistics for the entire year. • Track the sun’s path across the horizon in a beautifully crafted app. • Works anywhere – no internet connection required. • No ads. No tracking. Your data stays completely private. Sundown Gold (one-time purchase): • Get timely alerts for your scheduled events, so you’ll never miss a moment. • Add the widget to your home/lock screen to track upcoming events without even opening the app. • Personalize the app and widget by changing the theme color to suit your mood or style. • Keep track of events with countdown timers visible on your lock screen and Apple Watch. • Set up multiple favorite locations. ---------------- By downloading Sundown, you agree to: • Apple’s standard end user license agreement (EULA), available at: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ • Sundown’s privacy policy, available at: https://sundown.recursive.ink/privacy
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Binary Clock | Sundown |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.6 (8 ratings) — better |
| Number of ratings | — | 8 — better |
| Update frequency | Every 12 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 17.2 — better | 18.0 |
| Further details — not scored | ||
| Size | 0 MB | 32 MB |
| Age rating | 4+ | 4+ |
| Developer | Sayan Goswami | Recursive Ink Ltd |
In-app purchases
Binary Clock
No in-app purchases
Sundown
- Sundown Gold$5.99









