# Rachii Trig — Unit circle & trig graphs

> Unit circle & trig graphs (iPhone/iPad app by Noppon Sukpirom.)

- Source: https://appshunter.io/ios/app/rachii-trig/id6828886700 (this page in markdown: same URL + `.md`)
- Developer: [Noppon Sukpirom](https://appshunter.io/developer/6820386217)
- Category: Education
- Price: $2.99
- Age rating: 4+
- Requires: iOS 17.0 · 11 MB
- Languages: American English, Japanese, Korean, Chinese (Simplified, China), Thai
- Released: 2026-10-31
- Data updated: 2026-11-05

## What is Rachii Trig?

See how angles, the unit circle and trigonometric graphs connect on iPad and iPhone. Rachii Trig is a visual tool for classroom demonstrations and hands-on exploration.

EXPLORE THE UNIT CIRCLE
• Drag point P and watch the angle and values change together.
• See all four quadrants with x = cos θ and y = sin θ.
• Switch between degrees and radians, including inputs such as π/3.
• Read fractions, radicals and approximate values, plus reference and coterminal angles.

ALL SIX FUNCTION GRAPHS
• View sin, cos, tan, sec, cosec and cot together.
• Focus on one graph or compare several functions on shared axes.
• Explore reciprocal pairs and graph periods.
• Identify undefined values and breaks at vertical asymptotes.

TOOLS FOR DEMONSTRATION
• Write with pencil, pen and Apple Pencil on compatible iPads.
• Point with a temporary laser, erase and undo strokes.
• Circle and graph handwriting are saved separately on your device.
• Use the key-angle table and presentation mode in portrait or landscape.

Choose Thai, English, Simplified Chinese, Korean or Japanese inside the app. Core functions work offline. No account, advertising, subscription or in-app purchases.

Designed for visual exploration, without lesson courses or exercise sets. Graphs use a limited vertical range; function cards show the numerical values.

## Is Rachii Trig safe?

Not enough ratings yet to assess Rachii Trig.

## Is Rachii Trig legit?

Rachii Trig appears legitimate, with a few gaps. The AppsHunter Legitimacy Score for Rachii Trig is 65 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 1 release)

### 1.0 — 2026-11-01

No release notes.

## More apps by Noppon Sukpirom

- [Rachii Geometry](https://appshunter.io/ios/app/rachii-geometry/id6820892720)
- [Rachii Conic](https://appshunter.io/ios/app/rachii-conic/id6822310449)
- [Rachii CUBI](https://appshunter.io/ios/app/rachii-cubi/id6827056303)
- [Rachii Cycle](https://appshunter.io/ios/app/rachii-cycle/id6829464401)

All apps by Noppon Sukpirom: https://appshunter.io/developer/6820386217

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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 2026-11-05.*