# Natural Selection Sim vs Lexia PowerUp

The clearest difference is rating: Natural Selection Sim at 3.4 against Lexia PowerUp's 2.0. Natural Selection Sim also leads on review sentiment (50% vs 15%) and iOS requirement (10.0 vs 16.0). Lexia PowerUp's advantage is ratings volume (874 vs 22) and update cadence (monthly vs every 3 months). On price, ads, in-app purchases and monetization model 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 holds the better App Store score, 3.4 against 2.0. That said, the two scores are not equally well evidenced: Lexia PowerUp has 874 ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 50% of Natural Selection Sim's written reviews are positive against 15% of Lexia PowerUp's.

Natural Selection Sim ships an update every 3 months, Lexia PowerUp monthly. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Natural Selection Sim | Lexia PowerUp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.4 (22 ratings)](https://appshunter.io/ios/app/natural-selection-sim/id910261072/reviews)** | [2.0 (874 ratings)](https://appshunter.io/ios/app/lexia-powerup/id1396174569/reviews) |
| Number of ratings | 22 | **874** |
| Positive reviews | **50.0% of reviews** | 15.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 128 MB | 1.6 GB |
| Requires iOS | **10.0** | 16.0 |
| Devices | iPad | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Amplify Education, Inc.](https://appshunter.io/developer/433704168) | [Lexia Learning Systems, LLC](https://appshunter.io/developer/412471949) |

## 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


### Lexia PowerUp

[App page](https://appshunter.io/ios/app/lexia-powerup/id1396174569)

This app accelerates literacy for struggling adolescent readers in grades 6-12. It provides personalized, adaptive learning paths focusing on word study, grammar, and comprehension, grounded in the science of reading. Teachers receive data and tools to deliver targeted instruction.

**Highlights:** Adaptive learning paths, Word study instruction, Grammar skills, Reading comprehension, Progress monitoring, Personalized instruction

**Features:** Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🚀 Personalized learning experience
- 👍 Engaging and interactive content
- 💡 Comprehensive skill development
- 🚀 Data-driven insights for educators
- 👍 Accessibility and inclusivity

**What reviewers complain about**

- 🐛 Glitches and bugs
- 👎 Slow and boring voice
- 👎 Repetitive and childish content
- 👎 Frustrating when getting questions wrong
- 👎 Laggy and crashes frequently

**Reported bugs**

- Incorrect answers marked as wrong
- Progress not saving properly
- Freezing and crashing issues
- Inconsistent time tracking
- Compatibility problems on certain devices

**Requested features**

- Skip button for long instructions
- Adjustable speech speed
- More advanced content for higher grades
- Better reporting and progress tracking
- Improved stability and performance


## Frequently asked questions

### Is Natural Selection Sim free?

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

### Is Lexia PowerUp free?

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

### Which has better reviews, Natural Selection Sim or Lexia PowerUp?

Natural Selection Sim is rated higher. Natural Selection Sim averages 3.4 out of 5 from 22 ratings, while Lexia PowerUp averages 2.0 from 874 ratings.

### Do Natural Selection Sim or Lexia PowerUp have ads?

Neither Natural Selection Sim nor Lexia PowerUp shows ads.

### Which is updated more often, Natural Selection Sim or Lexia PowerUp?

Natural Selection Sim ships an update every 3 months, and Lexia PowerUp monthly. Most recently, Natural Selection Sim was updated on October 24, 2026 and Lexia PowerUp on October 27, 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.*