Sunlight Clock Free vs ARMAS
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Sunlight Clock Free
Visualize the current sunlight and darkness across the globe with interactive map projections. Track the sun's position or your own location automatically, or manually explore the map.
- Real-time sunlight visualization
- Multiple map projections
- Automatic sun/location tracking
- Manual map scrolling
- Interactive globe view
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Sunlight Clock shows you where the sun is shining in the world right now. You can choose different projections for rendering the map, including Mercator, Mollweide, azimuthal equidistant, and others. The map can automatically follow the sun or your location throughout the day. You can also scroll the map to place it how you like.
ARMAS
Real-time radiation monitoring for aviation and space weather awareness. Pairs with hardware detectors or provides data from global systems for pilots and travelers.
- Real-time radiation monitoring
- Space weather awareness
- Pairs with ARMAS Flight Modules
- Detects various radiation types
- Global airspace coverage
- Data from ground and space systems
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The Automated Radiation Measurements for Aerospace Safety (ARMAS) program has been developed with NASA funding. It provides accurate, real-time radiation monitoring along with radiation and space weather awareness for the global airspace up to 100 km altitude. The ARMAS app is part of this program and does two tasks: - it pairs with and controls the 7th generation ARMAS Flight Module (FM7) and the 12th generation ARMAS Flight Module (FM12) radiation detector (purchased separately) to provide the highest quality, real-time dose and dose rates in aircraft and suborbital vehicles. It is sensitive to radiation from all sources including heavy ions, alphas, protons, neutrons, electrons, and gamma-rays. - it provides radiation awareness by hosting real-time space weather data coming from dozens of ground- and space-based systems that report all the information relevant to radiation processes without requiring a purchase of the FM7 or FM12. ARMAS is the 'gold-standard' in real-time radiation monitoring and awareness used by professional pilots, business travelers, and commercial space tourists. The ARMAS program is developed and operated by Space Environment Technologies, which specializes in space weather as an official NOAA "Weather Ready Nation" Ambassador.
Screenshots
Verdict
The clearest difference is rating: ARMAS at 4.3 against Sunlight Clock Free's 3.7. ARMAS also leads on update cadence (every 2 months vs every 18 months) and review sentiment (100% vs 74%). Sunlight Clock Free's advantage is in-app purchases (none vs 3) and iOS requirement (8.0 vs 14.0). On price, ratings volume, ads and device support 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. ARMAS sells 3 in-app purchases, starting at $2.99 per year. Sunlight Clock Free asks for nothing beyond the download.
ARMAS holds the better App Store score, 4.3 against 3.7. Both are backed by a comparable volume of ratings — 10 and 6 respectively. Written reviews point the same way: 74% of Sunlight Clock Free's written reviews are positive against 100% of ARMAS's.
Sunlight Clock Free ships an update every 18 months, ARMAS every 2 months. The most recent releases landed on October 31, 2026 and November 2, 2026 respectively.
| Parameter | Sunlight Clock Free | ARMAS |
|---|---|---|
| Price | Free | Free |
| Rating | 3.7 (10 ratings) | 4.3 (6 ratings) — better |
| Positive reviews | 74.4% of reviews | 100.0% of reviews — better |
| Number of ratings | 10 — better | 6 |
| Update frequency | Every 18 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Free with in-app purchases |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 14.0 |
| Further details — not scored | ||
| Size | 12 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | Milk LLC | Space Environment Technologies, LLC. |
Customer experience
Sunlight Clock Free
ARMAS
In-app purchases
Sunlight Clock Free
No in-app purchases
ARMAS
- Premier$2.991 Year
- Professional$2.991 Year
- Member$2.99









