# COSMOS vs Solve It! Pre

The clearest difference is update cadence: Solve It! Pre at every 6 days against COSMOS's every 2 weeks. Solve It! Pre also leads on monetization model (free with in-app purchases vs paid). COSMOS's advantage is ratings volume (4 vs 1) and iOS requirement (15.0 vs 17.0). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. COSMOS sells 3 one-off in-app purchases and Solve It! Pre sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for COSMOS against 5.0 for Solve It! Pre. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

COSMOS ships an update every 2 weeks, Solve It! Pre every 6 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | COSMOS | Solve It! Pre |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/cosmos-3d-solar-system/id6792780408/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/solve-it-pre-algebra/id6817402311/reviews) |
| Number of ratings | **4** | 1 |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 6 days** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 8 MB | 10 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [yuudai tasaki](https://appshunter.io/developer/1861229093) | [Zubin Khavarian](https://appshunter.io/developer/6815880720) |

## What reviewers say

### COSMOS

[App page](https://appshunter.io/ios/app/cosmos-3d-solar-system/id6792780408)

Explore a real-time 3D model of the solar system, accurately depicting planet positions based on orbital mechanics. Zoom in on celestial bodies, control time to view past or future sky events, and learn details about each planet. This app offers an ad-free, offline experience with a one-time purchase.

**Highlights:** Real-time planet and moon positions, Scrub through time for past/future views, Photo-realistic textures, Adjustable time scale, Free exploration with pinch and swipe, Detailed information on celestial bodies

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Support the Developer | $1.99 | one-time |
| Support the Developer | $4.99 | one-time |
| Support the Developer | $9.99 | one-time |


### Solve It! Pre

[App page](https://appshunter.io/ios/app/solve-it-pre-algebra/id6817402311)

This app teaches pre-algebra concepts through animated visuals and interactive games. It breaks down complex ideas into short lessons, offering practice and quizzes with immediate feedback. Users can track their progress and play engaging games to reinforce learned skills.

**Highlights:** Animated visual explanations for math rules, 66 short lessons across 14 tracks, Learn, practice, and quiz format, Interactive games for skill reinforcement, Progress tracking and results tab, No timers or lives in learning mode

**Features:** macOS Compatibility, Family Sharing, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Version | $4.99 | one-time |


## Frequently asked questions

### Is COSMOS free?

COSMOS is free to download, with in-app purchases available.

### Is Solve It! Pre free?

Solve It! Pre is free to download, with in-app purchases available.

### Which has better reviews, COSMOS or Solve It! Pre?

COSMOS and Solve It! Pre are both rated 5.0 out of 5 on the App Store, from 4 and 1 ratings respectively.

### Do COSMOS or Solve It! Pre have ads?

Neither COSMOS nor Solve It! Pre shows ads.

### Which is updated more often, COSMOS or Solve It! Pre?

COSMOS ships an update every 2 weeks, and Solve It! Pre every 6 days. Most recently, COSMOS was updated on November 6, 2026 and Solve It! Pre on October 31, 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.*