Comparison

Solar System Clock vs SpaSync

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

Head to head
About

Solar System Clock

Explore the time and positions of celestial bodies across our solar system. View analog and digital clocks for planets, dwarf planets, and moons, with interactive maps and customizable widgets. Understand planetary seasons and translate times between objects.

Highlights
  • Planet and moon time displays
  • Analog and digital clock formats
  • Interactive solar system map
  • Customizable widgets
  • Planetary season information
  • Time translation between celestial bodies
Features
Read full description

No AI was used in the making of this app, including code and visual assets. The app comes with the Earth and Mars clocks free of charge (including associated moons), and additional planet clocks can be purchased through the app or the App Store. The purchase also includes the new customisable widgets and the current and past positions of supported objects. Did you ever want to know the time on Saturn? The simple Solar System Clock can tell the time on any planet or dwarf planet, and the Sun in relation to Earth time. Calculated from the starting date of the Gregorian calendar, the app displays seconds, minutes, hours, days and years for each object based on orbit and rotation data. The time is given in both analog and digital formats and can be stopped and restarted for easy viewing, while keeping to the accurate localised time. A single analog clock face for all planets and dwarf planets is also included, and can be split into two clocks for main planets and dwarf planets.Β Times can be freely translated between planets, the Sun and moons. The app also provides the current and past positions of the planets, moons and dwarf planets to scale in the form of an interactive map, and the seasons on every planet and dwarf planet. A widget form of the Earth and Mars clocks is provided for circular widget slots on Apple Watch, and widgets on other supported devices can be customised within the app. An iMessage extension is also included to enable easy communication using the time systems. The main clock can also be projected as functional wall art.

About

SpaSync

Features
Read full description

Experience the ultimate in smart spa management. SpaSync transforms your hot tub into a fully automated, data-driven wellness center. Whether you're in bed or on the couch, your perfect soak is just a tap away. Designed for owners who demand more than a simple on/off switch, SpaSync provides the reliability and advanced features that factory apps often miss. -- WHY UPGRADE TO SPASYNC PREMIUM? SpaSync is free to download and use for basic remote control. Our Premium tier unlocks the advanced automation and insights needed to truly optimize your spa experience: * SMART SCHEDULING Don't wait for your spa to heat up. Set custom temperature and filtration cycles to match your daily routine. Wake up to 37Β°C/100Β°F every morning or have it ready the second you get home from work. * USAGE ANALYTICS Knowledge is power - and savings. View detailed heat history and energy patterns to identify exactly how much it costs to run your tub. Optimise your settings to reduce energy waste and lower your utility bills. * NATIVE APPLE WATCH APP Control your jets, monitor the current temperature, and adjust the heat directly from your wrist. Perfect for when you're already in the water and don't want to reach for your phone. * ADVANCED HOME AUTOMATIONS Seamlessly integrate your spa into your connected home ecosystem with Webhooks. Sync your spa with your "Morning" or "Goodnight" routines for a truly frictionless lifestyle. * IPHONE WIDGETS Check your spa’s status and current temperature at a glance from your Home Screen or Lock Screen without even opening the app. --COMPATIBILITY & REQUIREMENTS SpaSync is a specialised tool engineered for specific hardware. To ensure the best experience, please verify your setup: * OPTIMIZED FOR: Balboa-enabled Wi-Fi modules (BP and GS series). * HARDWARE: Requires a compatible Wi-Fi bridge installed on your spa's control pack. * NOTE: This app is NOT currently compatible with Gecko Alliance systems. -- START YOUR FREE TRIAL Join thousands of spa owners who have upgraded their relaxation. Every new user is eligible for a free trial of SpaSync Premium. Explore every feature, track your data, and experience the convenience risk-free. If it’s not for you, cancel anytime before the trial ends. Elevate your soak. Sync your life. Download SpaSync today. Privacy Policy: https://spasync.app/privacy Terms of Use (EULA): https://spasync.app/terms

Screenshots

Solar System Clock4 screens
SpaSync4 screens

Verdict

The call

The clearest difference is ads: Solar System Clock at none against SpaSync's shown. SpaSync's advantage is update cadence (every 2 weeks vs every 6 weeks). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Solar System Clock sells 1 one-off in-app purchase and SpaSync sells 2 in-app purchases, starting at $1.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Solar System Clock ships an update every 6 weeks, SpaSync every 2 weeks. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.

Scorecard2 real differences Β· 6 level
Solar System Clock versus SpaSync: the parameters behind the verdict, then further details
ParameterSolar System ClockSpaSync
PriceFreeFree
Positive reviews100.0% of reviewsβ€”
Update frequencyEvery 6 weeksEvery 2 weeks β€” better
AdsNo β€” betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesβ€”
DevicesiPhone, iPad, Apple Watch β€” betteriPhone, Apple Watch
Requires iOS18.017.0 β€” better
Further details β€” not scored
Size26 MB38 MB
Age rating4+4+
DeveloperSunita GeorgeLachlan Ross

In-app purchases

1 purchases

Solar System Clock

One-time1
  • All Planets and Dwarf Planets$2.99
2 purchases

SpaSync

Subscriptions2
  • SpaSync Premium (Monthly)7 Days trial$1.991 Month
  • SpaSync Premium (Yearly)7 Days trial$19.991 Year

Questions

Is Solar System Clock free?
Solar System Clock is free to download, with in-app purchases available.
Is SpaSync free?
SpaSync is free to download, with in-app purchases available.
Do Solar System Clock or SpaSync have ads?
SpaSync shows ads; Solar System Clock does not.
Which is updated more often, Solar System Clock or SpaSync?
Solar System Clock ships an update every 6 weeks, and SpaSync every 2 weeks. Most recently, Solar System Clock was updated on October 15, 2026 and SpaSync on October 5, 2026.

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