# OTROTango vs STEM Prep Tutoring

The clearest difference is update cadence: OTROTango at monthly against STEM Prep Tutoring's every 10 months. 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.

OTROTango ships an update monthly, STEM Prep Tutoring every 10 months. The most recent releases landed on September 15, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | OTROTango | STEM Prep Tutoring |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 10 months |
| Size | 32 MB | 226 MB |
| Requires iOS | **12.4** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ALGO TECH LIMITED](https://appshunter.io/developer/1220310133) | [STEM Consulting Inc](https://appshunter.io/developer/1815470791) |

## What reviewers say

### OTROTango

[App page](https://appshunter.io/ios/app/otrotango/id1223066628)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### STEM Prep Tutoring

[App page](https://appshunter.io/ios/app/stem-prep-tutoring/id6746155613)

**In-app purchases:** none


## Frequently asked questions

### Is OTROTango free?

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

### Is STEM Prep Tutoring free?

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

### Do OTROTango or STEM Prep Tutoring have ads?

Neither OTROTango nor STEM Prep Tutoring shows ads.

### Which is updated more often, OTROTango or STEM Prep Tutoring?

OTROTango ships an update monthly, and STEM Prep Tutoring every 10 months. Most recently, OTROTango was updated on September 15, 2026 and STEM Prep Tutoring 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.*