Comparison

Project Planet Space vs Solar System Clock

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

Head to head
About

Project Planet Space

Features
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Project Planet - an interactive map of our solar system How much would you weigh on Jupiter? Why does a day on Mercury last longer than its year? Project Planet turns space facts into a fingertip-sized journey. Scroll through all nine planets (Pluto included), feel each world's pull on your own body, and explore the numbers astronomers have spent decades collecting. Highlights - Sticky scroll across the system: from Mercury to Pluto, each planet stays centred long enough for you to take it in. - You, on every world: enter your weight and age once and watch them recalculated by each planet's gravity and orbital period. - Five rich widgets per planet: surface temperature with reference markers (Antarctica, freezing, boiling), atmospheric pressure with composition chart, travel times from Earth from walking up to the speed of light, gravitational force with everyday objects (phone, backpack, car), and an interactive pressure simulator with phase changes for water, oxygen, CO2, hydrogen, nitrogen and mercury (Antoine equation under the hood). - Six languages: Czech, English, German, Slovak, Spanish and French, auto-detected from your device. - Metric or imperial: switch instantly; weights, temperatures and distances follow your preference. - Crafted to feel like a small cosmic museum: dark cosmic theme, hand-tuned typography, subtle scroll choreography, and a right rail that lets you jump to any planet. - Built on real data: gravitational accelerations, orbital periods, NASA mean temperatures, atmospheric compositions and substance phase transitions. Requires an internet connection. The app runs as a continuously updated webview and uses native iOS capabilities such as haptic feedback to add a tactile dimension to your interstellar journey.

About

Solar System Clock

Features
Read full description

See the positions of all planets in our Solar System based on the current date. Or, you can set your own custom date to see the alignment of our planets from a future date or a past date. You can use this app to find out the best time to watch a planet in the sky by finding out when it will be closest to Earth.

Screenshots

Project Planet Space4 screens
Solar System Clock3 screens

Verdict

The call

The clearest difference is update cadence: Solar System Clock at every 2 days against Project Planet Space's every 25 months. On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Project Planet Space ships an update every 25 months, Solar System Clock every 2 days. The most recent releases landed on September 30, 2026 and October 9, 2026 respectively.

Scorecard1 real difference ยท 5 level
Project Planet Space versus Solar System Clock: the parameters behind the verdict, then further details
ParameterProject Planet SpaceSolar System Clock
PriceFreeFree
Update frequencyEvery 25 monthsEvery 2 days โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS15.0 โ€” better16.6
Further details โ€” not scored
Size2 MB5 MB
Age rating4+4+
DeveloperMiroslav HanzelkaMateusz Andrzejczuk

In-app purchases

None

Project Planet Space

No in-app purchases

None

Solar System Clock

No in-app purchases

Questions

Is Project Planet Space free?
Project Planet Space is free to download, with no in-app purchases.
Is Solar System Clock free?
Solar System Clock is free to download, with no in-app purchases.
Do Project Planet Space or Solar System Clock have ads?
Neither Project Planet Space nor Solar System Clock shows ads.
Which is updated more often, Project Planet Space or Solar System Clock?
Project Planet Space ships an update every 25 months, and Solar System Clock every 2 days. Most recently, Project Planet Space was updated on September 30, 2026 and Solar System Clock on October 9, 2026.

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