# RowingSTEM vs AstroAlert

The clearest difference is in-app purchases: RowingSTEM at none against AstroAlert's 1. RowingSTEM also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (12.0 vs 14.0.0). On price, ads and device support there is nothing between them.

Both are free to download. AstroAlert sells 1 in-app purchase, starting at $2.99 per month. RowingSTEM asks for nothing beyond the download.

RowingSTEM ships an update every 5 weeks, AstroAlert every 5 months. The most recent releases landed on October 3, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | RowingSTEM | AstroAlert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (8 ratings)](https://appshunter.io/ios/app/rowingstem/id1475009298/reviews)** | — |
| Number of ratings | **8** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | Free | — |
| Size | 73 MB | 54 MB |
| Requires iOS | **12.0** | 14.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Power Ten Development LLC](https://appshunter.io/developer/1413480504) | [THEO BERNARD ROBERT PARAMELLE](https://appshunter.io/developer/1786620053) |

## What reviewers say

### RowingSTEM

[App page](https://appshunter.io/ios/app/rowingstem/id1475009298)

This app supports a rowing curriculum by collecting and analyzing real-time data from Concept2 rowing machines. It helps students understand science and math concepts through rowing metrics and provides exportable data for further analysis.

**Highlights:** Real-time rowing metric collection, Data analysis with graphing, Exportable CSV data, Power output calculation for device comparison, Access to PDF curriculum materials

**In-app purchases:** none


### AstroAlert

[App page](https://appshunter.io/ios/app/astroalert/id6754640471)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| AstroAlert+ Mensuel | $2.99 | per month |


## Frequently asked questions

### Is RowingSTEM free?

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

### Is AstroAlert free?

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

### Do RowingSTEM or AstroAlert have ads?

Neither RowingSTEM nor AstroAlert shows ads.

### Which is updated more often, RowingSTEM or AstroAlert?

RowingSTEM ships an update every 5 weeks, and AstroAlert every 5 months. Most recently, RowingSTEM was updated on October 3, 2026 and AstroAlert on September 25, 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.*