Circle Tracker vs Project SPECTRA!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Circle Tracker
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Easy to use, full of fun to control, but also make a variety of imaginative play possible. Programming can make the robot according to your instructions to complete a series of actions, ONEBOT robot unique graphical programming mode, the original professional, complex command code graphics, modular, with the fun of the game tutorial, easy to learn, full of endless fun to explore.
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.
Screenshots
Verdict
The clearest difference is update cadence: Circle Tracker at every 6 weeks against Project SPECTRA!'s every 33 months. Circle Tracker also leads on device support (3 vs 1) and iOS requirement (8.0 vs 12.0). On price, ads and in-app purchases 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.
Circle Tracker ships an update every 6 weeks, Project SPECTRA! every 33 months. The most recent releases landed on September 23, 2026 and October 6, 2026 respectively.
| Parameter | Circle Tracker | Project SPECTRA! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks — better | Every 33 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 8.0 — better | 12.0 |
| Further details — not scored | ||
| Size | 48 MB | 13 MB |
| Age rating | 4+ | 4+ |
| Developer | Beijing IQI Technology Co.,Ltd. | University of Colorado Boulder |
In-app purchases
Circle Tracker
No in-app purchases
Project SPECTRA!
No in-app purchases
Questions
Is Circle Tracker free?
Is Project SPECTRA! free?
Do Circle Tracker or Project SPECTRA! have ads?
Which is updated more often, Circle Tracker or Project SPECTRA!?
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