# Sci vs STEM FLEX

The clearest difference is update cadence: STEM FLEX at every 5 days against Sci's every 6 weeks. 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.

Sci ships an update every 6 weeks, STEM FLEX every 5 days. The most recent releases landed on September 27, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Sci | STEM FLEX |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 weeks | **Every 5 days** |
| Size | 86 MB | 30 MB |
| Requires iOS | **13.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [山东远大朗威教育科技股份有限公司](https://appshunter.io/developer/1197726190) | [FableVision, INC](https://appshunter.io/developer/330019981) |

## What reviewers say

### Sci

[App page](https://appshunter.io/ios/app/sci-lab-primary/id1387072836)

**In-app purchases:** none


### STEM FLEX

[App page](https://appshunter.io/ios/app/stem-flex/id6744830195)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Sci free?

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

### Is STEM FLEX free?

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

### Do Sci or STEM FLEX have ads?

Neither Sci nor STEM FLEX shows ads.

### Which is updated more often, Sci or STEM FLEX?

Sci ships an update every 6 weeks, and STEM FLEX every 5 days. Most recently, Sci was updated on September 27, 2026 and STEM FLEX 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.*