Kepler's Laws vs Project SPECTRA!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Kepler's Laws
Explore animated visualizations and interactive tasks designed to help you grasp Kepler's laws of planetary motion. This educational tool offers a clear way to understand complex astronomical concepts through visual aids and practical exercises.
- Animated visualizations
- Interactive tasks
- Understanding planetary motion
- Educational tool
- Astronomy concepts
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Animations and tasks that facilitate the understanding of Kepler's laws.
Project SPECTRA!
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Learn about the Solar System using real data! The Project SPECTRA! app is a set of interactive lessons to help students learn science topics, particularly how light is used to explore the Solar System. It is meant to be an in-classroom activity, accompanying lessons found here: https://lasp.colorado.edu/home/education/k-12/project-spectra/ The app features interactive activities for 11 different lessons. Some of the activities serve as alternatives to purchasing scientific equipment to use in the classroom. For an accessible version of the app, see the above link.
Verdict
The clearest difference is update cadence: Kepler's Laws at every 7 months against Project SPECTRA!'s every 33 months. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Kepler's Laws ships an update every 7 months, Project SPECTRA! every 33 months. The most recent releases landed on July 4, 2026 and June 5, 2026 respectively.
| Parameter | Kepler's Laws | Project SPECTRA! |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 7 months — better | Every 33 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPad | iPad |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 16 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Vladimir Vascak | University of Colorado Boulder |
In-app purchases
Kepler's Laws
No in-app purchases
Project SPECTRA!
No in-app purchases
Questions
Is Kepler's Laws free?
Is Project SPECTRA! free?
Do Kepler's Laws or Project SPECTRA! have ads?
Which is updated more often, Kepler's Laws or Project SPECTRA!?
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