# Trigonometry Help Lite vs Tri

The clearest difference is ads: Trigonometry Help Lite at none against Tri's shown. Trigonometry Help Lite also leads on review sentiment (88% vs 67%) and ratings volume (768 vs 17). On price, update cadence, in-app purchases and monetization model there is nothing between them.

Both are free to download. Trigonometry Help Lite sells 3 one-off in-app purchases and Tri sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Trigonometry Help Lite holds the better App Store score, 4.7 against 4.5. That said, the two scores are not equally well evidenced: Trigonometry Help Lite has 768 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 88% of Trigonometry Help Lite's written reviews are positive against 67% of Tri's.

Trigonometry Help Lite ships an update every 6 weeks, Tri every 2 months. The most recent releases landed on September 26, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | Trigonometry Help Lite | Tri |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (768 ratings)](https://appshunter.io/ios/app/trigonometry-help-lite/id1465685523/reviews)** | [4.5 (17 ratings)](https://appshunter.io/ios/app/tri-go-math-your-math-helper/id1525513476/reviews) |
| Number of ratings | **768** | 17 |
| Positive reviews | **87.5% of reviews** | 66.7% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 17 MB | 48 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Armchair Engineering](https://appshunter.io/developer/398901339) | [Alejandro Apodaca](https://appshunter.io/developer/1524127326) |

## What reviewers say

### Trigonometry Help Lite

[App page](https://appshunter.io/ios/app/trigonometry-help-lite/id1465685523)

This app quickly calculates unknown angles and sides of right-angled triangles. It offers a workings view for detailed solutions, scale drawings, and a formula reference. Input angles in various formats and customize decimal precision.

**Highlights:** Solve right-angled triangles, View detailed math workings, Scale drawing of solved triangle, Basic trig formulae reference, Multiple angle input formats, Customizable decimal places

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Trig Help Premium | $2.99 | one-time |
| Trig Help Premium | $3.99 | one-time |
| Trig Help Premium | $5.99 | one-time |

**What reviewers like**

- 👍 Simple and intuitive user interface
- 🚀 Quick and fast calculations
- 💼 Practical for professional use (construction, surveying)
- ✅ Reliable and doesn't crash
- 📚 Helpful for learning trigonometry

**What reviewers complain about**

- 💰 Unclear upgrade value proposition
- 📊 Limited decimal place precision in free version
- 🔍 Insufficient feature differentiation between tiers
- ⚠️ Calculation accuracy issues reported

**Reported bugs**

- Incorrect calculation results in some cases

**Requested features**

- Better visual representation of triangles
- Clearer explanation of premium features
- Higher default decimal place precision
- More detailed feature descriptions for paid tiers


### Tri

[App page](https://appshunter.io/ios/app/tri-go-math-your-math-helper/id1525513476)

This app simplifies math homework with a suite of tools including area, basic, and trigonometry calculators. It offers offline access and equation solvers for first and second-degree equations, with more features planned.

**Highlights:** Offline Access, Area Calculator, Basic Calculator, Trigonometry Calculator, Unit Converter, Equation Solvers

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Quitar anuncios | $1.99 | one-time |


## Frequently asked questions

### Is Trigonometry Help Lite free?

Trigonometry Help Lite is free to download, with in-app purchases available.

### Is Tri free?

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

### Which has better reviews, Trigonometry Help Lite or Tri?

Trigonometry Help Lite is rated higher. Trigonometry Help Lite averages 4.7 out of 5 from 768 ratings, while Tri averages 4.5 from 17 ratings.

### Do Trigonometry Help Lite or Tri have ads?

Tri shows ads; Trigonometry Help Lite does not.

### Which is updated more often, Trigonometry Help Lite or Tri?

Trigonometry Help Lite ships an update every 6 weeks, and Tri every 2 months. Most recently, Trigonometry Help Lite was updated on September 26, 2026 and Tri on June 4, 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.*