# SOH CAH TOA — Drill Right Triangle Trig!

> Drill Right Triangle Trig! (iPhone/iPad app by Laurence Stone.)

- Source: https://appshunter.io/ios/app/soh-cah-toa/id6742157017 (this page in markdown: same URL + `.md`)
- Developer: [Laurence Stone](https://appshunter.io/developer/1702094763)
- Category: Education
- Price: $0.99
- Age rating: 4+
- Requires: iOS 18.2 · 8 MB
- Languages: American English
- Released: 2025-02-25
- Data updated: 2026-08-03
- User reviews in markdown: https://appshunter.io/ios/app/soh-cah-toa/id6742157017/reviews.md

## What is SOH CAH TOA?

Two practice drills backed by three info screens help you learn and apply SOH CAH TOA fast!  Proof: My students used this app, and the scores on the test were never higher!  As a bonus, they also learned it a lot faster!

One drill is solving for an angle, the other is solving for a side.  Each question is answered in two stages: identify the trig ratio to use, then identify the correct equation.

As you continue to practice, the app keeps track of how many correct and incorrect responses you've made, your "streak," i.e., how many in a row you've had correct, and your all-time highest streak, so you can see your improvement over time!  (These can be reset to zero at any time.)

Also includes info screens detailing how I explain sine, cosine, and tangent to my students, which has evolved over 20+ years.  Even if you know the basics, these are worth a read to see if you can pick up any new insights.  Any new connections you can build around the same core information makes you stronger and faster!

As everyone knows, practice makes perfect... especially the right kind of practice!  By giving you instant feedback, the drills in this app not only help you learn faster but prevent you from "learning" bad information -- which is always a bear to unlearn.  Get the app and use it, and you'll master soh-cah-toa in no time!

## Chart rankings

- #200 in Top Paid · Education (US App Store)


## Version history (last 2 releases)

### 1.1 — 2025-05-16

Bug fix for very narrow screens: bounds error on sliders in AboutSineView, AboutCosineView, AboutTangentView.

### 1.0 — 2025-02-25

No release notes.

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## More apps by Laurence Stone

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- [Learn Poisson Binomial Normal](https://appshunter.io/ios/app/learn-poisson-binomial-normal/id6746050112)

All apps by Laurence Stone: https://appshunter.io/developer/1702094763

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-03.*