Comparison

SunTanApp vs Fasting Window

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

Head to head
About

SunTanApp

Features
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SunTanApp helps you tan smarter by tracking your sun exposure in real time using UV-based calculations, personalized skin settings, and guided tanning timers. Instead of guessing how long you have been in the sun, SunTanApp helps you manage each tanning session with a clear exposure tracker, rotation reminders, sunscreen timing, and session history. Whether you are lying by the pool, spending time at the beach, or getting sun in the backyard, SunTanApp is designed to help you stay more aware of your UV exposure and build more even tanning habits. Features include: • UV-based exposure tracking - SunTanApp uses current UV conditions to estimate your sun exposure over time. • Personalized tanning guidance - Customize your session based on your skin type, base tan, sunscreen use, and tanning goals. • Rotation timer - Get reminders to switch sides so you can work toward a more even tan. • Sunscreen timer - Track when sunscreen protection may need attention during your session. • Cloud and sun adjustments - Account for changing sky conditions during your tanning session. • Side-by-side session tracking - Track exposure separately for each side of your body. • TDU exposure system - SunTanApp uses Tanning Dosage Units to give you a clearer way to understand cumulative UV exposure during a session. • Session progress display - See your estimated exposure, remaining time, and tanning progress while you are outside. SunTanApp is not a substitute for medical advice, and it does not guarantee prevention of sunburn, skin damage, or UV-related health risks. Always use sunscreen appropriately, follow product directions, and practice responsible sun safety. SunTanApp: tan smarter, rotate evenly, and stay aware of your time in the sun.

About

Fasting Window

Features
Read full description

Record your own fasting times, without an account. YOUR TIMES IN ONE WINDOW - Read your planned time to eat again, with its date - Correct an active start within the past 24 hours - Choose no goal to record elapsed time without a planned time - Keep your selected 16:8, 18:6, 20:4, OMAD or Custom preset (Custom is saved as 16 hours) - Receive a reminder at your chosen goal, when notifications are allowed - End at any time, including before your chosen goal KEEP YOUR RECORDS - See actual lengths and summaries from your last 90 records - Correct the end time of records that ended within the past 24 hours - Existing local records and settings are preserved SAFETY INFORMATION This is a time record, not a medical tool. It does not measure metabolism or provide medical advice. Goals are personal settings, not recommendations to fast longer. Talk with a healthcare professional before considering fasting, especially if you are under 25, pregnant or breastfeeding, take insulin or diabetes medicines, take medicines that require food, have a seizure disorder, work night shifts or operate heavy machinery. If you have or have had an eating disorder, avoid fasting and consult a healthcare professional. If you feel unwell, stop regardless of your goal and seek professional advice. Sources: NIH News in Health, To Fast or Not to Fast, December 2019; https://newsinhealth.nih.gov/2019/12/fast-or-not-fast Johns Hopkins Medicine, Intermittent Fasting: What is it, and how does it work?, updated April 7, 2026; https://www.hopkinsmedicine.org/health/wellness-and-prevention/intermittent-fasting-what-is-it-and-how-does-it-work

Screenshots

SunTanApp3 screens
Fasting Window4 screens

Verdict

The call

The clearest difference is update cadence: SunTanApp at every 5 weeks against Fasting Window's every 2 months. Fasting Window's advantage is iOS requirement (13.0 vs 16.0). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

SunTanApp ships an update every 5 weeks, Fasting Window every 2 months. Both last shipped on October 24, 2026.

Scorecard2 real differences · 6 level
SunTanApp versus Fasting Window: the parameters behind the verdict, then further details
ParameterSunTanAppFasting Window
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 5 weeks — betterEvery 2 months
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.013.0 — better
Further details — not scored
Size8 MB21 MB
Age rating4+4+
DeveloperUnistellar Industries, LLCHeungYeol Kim

In-app purchases

None

SunTanApp

No in-app purchases

None

Fasting Window

No in-app purchases

Questions

Is SunTanApp free?
SunTanApp is free to download, with no in-app purchases.
Is Fasting Window free?
Fasting Window is free to download, with no in-app purchases.
Do SunTanApp or Fasting Window have ads?
Neither SunTanApp nor Fasting Window shows ads.
Which is updated more often, SunTanApp or Fasting Window?
SunTanApp ships an update every 5 weeks, and Fasting Window every 2 months. Most recently, SunTanApp was updated on October 24, 2026 and Fasting Window on October 24, 2026.

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