# Natural Selection Sim vs Teach iLit 9

The clearest difference is iOS requirement: Natural Selection Sim at 10.0 against Teach iLit 9's 15.0. On price, update cadence, 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.

Natural Selection Sim ships an update every 3 months, Teach iLit 9 every 4 months. The most recent releases landed on October 26, 2026 and October 29, 2026 respectively.

## The numbers

| Metric | Natural Selection Sim | Teach iLit 9 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (22 ratings)](https://appshunter.io/ios/app/natural-selection-sim/id910261072/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | — |
| Size | 128 MB | 10 MB |
| Requires iOS | **10.0** | 15.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Amplify Education, Inc.](https://appshunter.io/developer/433704168) | [Savvas Learning Company LLC](https://appshunter.io/developer/1521350472) |

## What reviewers say

### Natural Selection Sim

[App page](https://appshunter.io/ios/app/natural-selection-sim/id910261072)

This educational simulation models natural selection processes. It is designed for use with a specific science curriculum and requires a school-provided login and license to function.

**Highlights:** Natural selection simulation, Educational curriculum integration, Requires school login and license, iPad compatible

**In-app purchases:** none


### Teach iLit 9

[App page](https://appshunter.io/ios/app/teach-ilit-9/id1470117673)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Natural Selection Sim free?

Natural Selection Sim is free to download, with no in-app purchases.

### Is Teach iLit 9 free?

Teach iLit 9 is free to download, with no in-app purchases.

### Do Natural Selection Sim or Teach iLit 9 have ads?

Neither Natural Selection Sim nor Teach iLit 9 shows ads.

### Which is updated more often, Natural Selection Sim or Teach iLit 9?

Natural Selection Sim ships an update every 3 months, and Teach iLit 9 every 4 months. Most recently, Natural Selection Sim was updated on October 26, 2026 and Teach iLit 9 on October 29, 2026.

---

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