# COSMO Didactic vs PleiSolar

The clearest difference is update cadence: PleiSolar at every 8 months against COSMO Didactic's every 23 months. COSMO Didactic's advantage is iOS requirement (9.0 vs 12.0). On price, ads, in-app purchases and device support there is nothing between them.

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

COSMO Didactic ships an update every 23 months, PleiSolar every 8 months. The most recent releases landed on September 28, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | COSMO Didactic | PleiSolar |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 23 months | **Every 8 months** |
| Size | 59 MB | 46 MB |
| Requires iOS | **9.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Officine Pixel S.n.c. di Romboli Davide e Tedaldi Lamberto](https://appshunter.io/developer/841274689) | [Brahma Spa](https://appshunter.io/developer/1211596852) |

## What reviewers say

### COSMO Didactic

[App page](https://appshunter.io/ios/app/cosmo-didactic/id1412549644)

**Features:** macOS Compatibility

**In-app purchases:** none


### PleiSolar

[App page](https://appshunter.io/ios/app/pleisolar/id6444880416)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is COSMO Didactic free?

COSMO Didactic is free to download, with no in-app purchases.

### Is PleiSolar free?

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

### Do COSMO Didactic or PleiSolar have ads?

Neither COSMO Didactic nor PleiSolar shows ads.

### Which is updated more often, COSMO Didactic or PleiSolar?

COSMO Didactic ships an update every 23 months, and PleiSolar every 8 months. Most recently, COSMO Didactic was updated on September 28, 2026 and PleiSolar on October 2, 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.*