Comparison

Sunlight Clock Free vs ARMAS

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Real-time sunlight visualization
  • Multiple map projections
  • Automatic sun/location tracking
  • Manual map scrolling
  • Interactive globe view
Features
Read full description

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.

About

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.

Highlights
  • 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
Features
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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

Sunlight Clock Free3 screens
ARMAS4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard6 real differences · 4 level
Sunlight Clock Free versus ARMAS: the parameters behind the verdict, then further details
ParameterSunlight Clock FreeARMAS
PriceFreeFree
Rating3.7 (10 ratings)4.3 (6 ratings) — better
Positive reviews74.4% of reviews100.0% of reviews — better
Number of ratings10 — better6
Update frequencyEvery 18 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size12 MB38 MB
Age rating4+4+
DeveloperMilk LLCSpace Environment Technologies, LLC.

Customer experience

Sunlight Clock Free

All ratings10 ratings
Positive50.0%
Neutral30.0%
Negative20.0%
Written reviews43 reviews
Positive74.4%
Neutral7.0%
Negative18.6%

ARMAS

All ratings6 ratings
Positive83.3%
Neutral0.0%
Negative16.7%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Sunlight Clock Free

No in-app purchases

3 purchases

ARMAS

Subscriptions2
  • Premier$2.991 Year
  • Professional$2.991 Year
One-time1
  • Member$2.99

Questions

Is Sunlight Clock Free free?
Sunlight Clock Free is free to download, with no in-app purchases.
Is ARMAS free?
ARMAS is free to download, with in-app purchases available.
Which has better reviews, Sunlight Clock Free or ARMAS?
ARMAS is rated higher. Sunlight Clock Free averages 3.7 out of 5 from 10 ratings, while ARMAS averages 4.3 from 6 ratings.
Do Sunlight Clock Free or ARMAS have ads?
Neither Sunlight Clock Free nor ARMAS shows ads.
Which is updated more often, Sunlight Clock Free or ARMAS?
Sunlight Clock Free ships an update every 18 months, and ARMAS every 2 months. Most recently, Sunlight Clock Free was updated on October 31, 2026 and ARMAS on November 2, 2026.

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