Comparison

True Solar Time vs Sunsync

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

Head to head
About

True Solar Time

This application displays the actual solar time based on your location and the Earth's rotation. It shows sunrise, sunset, and midday times, helping you understand your position relative to the sun. Features include location and date selection, a list of muhurtas, and easy-to-read fonts.

Highlights
  • True Solar Time display
  • Sunrise and sunset times
  • Midday time calculation
  • Location selection
  • Date selection
  • List of muhurtas
  • Easy-to-read fonts and colors
Features
Read full description

TRUE SOLAR TIME Is an app that allows you to see True Solar Time in your area. While our planet is rotating, seasons change & daylight savings vary from place to place, it is quite difficult to figure where are you at in the Universe! True Solar Time will allow you to see sunrise, sunset & midday times according to your actual position in respect to the Sun! New in v2.x: - Location selection - Date selection - List of muhurtas - Easy to read fonts and colors

About

Sunsync

Features
Read full description

View and be notified of solar times--dawn, sunrise, sunset, and more! Have the accuracy of NOAA in your pocket--the times are as accurate as NOAA's online calculator with some modest improvements for solar noon and match timeanddate.com to within 1-2s. Keep your day in sync with the sun! - See times from all over the world and on any date! - Schedule a notification just once or be notified on a recurring schedule - Display a clock to visually see how near a solar time is - No or spotty internet connection? No problem. The app still functions. Offline Mode Features and Caveats With no internet connection, the app will still work, but it will need to be connected to the internet again every few days for recurring notifications to continue working automatically. If that is not possible, the user can manually make them continue to work by flicking the switch to turn them off and then on again every few days. If a user wants to create a new location while lacking an internet connection, the user can create a location using latitude and longitude coordinates, using the convention that negative values are South of the equator and West of the Prime Meridian. The location created while offline will lack timezone information to display the times to the user in the local time of that location, but otherwise, everything works as expected. When the user comes back online, the app will automatically attempt to update the location with a name (if a match can be found) and timezone. If multiple locations match to the same place, the app automatically deletes all but one of them--no duplicate locations are permitted. Clock View The user can turn on the clock view from time settings. The clock view will display the time of the event that is selected and the user's current time on the hands of a clock and will update as the user taps more events. Tap and hold one of the time events to make the clock view display that event's time without popping up the notification creation form. The color of the event's clock hand changes depending on whether the event time is AM or PM. Limitations The algorithm used comes from Jean Meeus' Astronomical Algorithms and will be accurate to within a minute for most latitudes (+/- 72 degrees, i.e., up to around the Polar Circles) and within 10 minutes otherwise. Due to atmospheric refraction and other conditions, the calculated times may be different from what is observed. The algorithm is very good from the years 1800-2100 with still reasonable but decreasing accuracy from the years -1000 to 3000. The algorithm has a higher risk of error outside that range.

Screenshots

True Solar Time4 screens
Sunsync4 screens

Verdict

The call

The clearest difference is in-app purchases: Sunsync at none against True Solar Time's 1. True Solar Time's advantage is update cadence (every 5 weeks vs every 4 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. True Solar Time sells 1 one-off in-app purchase. Sunsync asks for nothing beyond the download.

UpkeepUpdate frequency

True Solar Time ships an update every 5 weeks, Sunsync every 4 months. Both last shipped on October 25, 2026.

Scorecard2 real differences · 8 level
True Solar Time versus Sunsync: the parameters behind the verdict, then further details
ParameterTrue Solar TimeSunsync
PriceFreeFree
Rating3.9 (15 ratings) — better—
Positive reviews53.8% of reviews—
Number of ratings15 — better—
Update frequencyEvery 5 weeks — betterEvery 4 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size3 MB43 MB
Age rating4+4+
DeveloperKazansky AppsClusia LLC

In-app purchases

1 purchases

True Solar Time

One-time1
  • Full Version$2.99
None

Sunsync

No in-app purchases

Questions

Is True Solar Time free?
True Solar Time is free to download, with in-app purchases available.
Is Sunsync free?
Sunsync is free to download, with no in-app purchases.
Do True Solar Time or Sunsync have ads?
Neither True Solar Time nor Sunsync shows ads.
Which is updated more often, True Solar Time or Sunsync?
True Solar Time ships an update every 5 weeks, and Sunsync every 4 months. Most recently, True Solar Time was updated on October 25, 2026 and Sunsync on October 25, 2026.

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