# Circle Tracker vs Project SPECTRA!

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.

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.

## The numbers

| Metric | Circle Tracker | Project SPECTRA! |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 33 months |
| Size | 48 MB | 13 MB |
| Requires iOS | **8.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Beijing IQI Technology Co.,Ltd.](https://appshunter.io/developer/1166057913) | [University of Colorado Boulder](https://appshunter.io/developer/972210292) |

## What reviewers say

### Circle Tracker

[App page](https://appshunter.io/ios/app/circle-tracker/id1460564982)

**Features:** macOS Compatibility

**In-app purchases:** none


### Project SPECTRA!

[App page](https://appshunter.io/ios/app/project-spectra/id1561634722)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Circle Tracker free?

Circle Tracker is free to download, with no in-app purchases.

### Is Project SPECTRA! free?

Project SPECTRA! is free to download, with no in-app purchases.

### Do Circle Tracker or Project SPECTRA! have ads?

Neither Circle Tracker nor Project SPECTRA! shows ads.

### Which is updated more often, Circle Tracker or Project SPECTRA!?

Circle Tracker ships an update every 6 weeks, and Project SPECTRA! every 33 months. Most recently, Circle Tracker was updated on September 23, 2026 and Project SPECTRA! on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*