# Tri vs Cave 09

The clearest difference is ads: Cave 09 at none against Tri's shown. Cave 09 also leads on update cadence (every 2 months vs every 12 months) and iOS requirement (13.0 vs 15.6). On price, 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.

Tri ships an update every 12 months, Cave 09 every 2 months. The most recent releases landed on September 16, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Tri | Cave 09 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/tri-func/id496807268/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 12 months | **Every 2 months** |
| Monetization | Ad-supported | — |
| Size | 4 MB | 20 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thirdware.jp](https://appshunter.io/developer/464228680) | [Muhammad Yusuf](https://appshunter.io/developer/1838585163) |

## What reviewers say

### Tri

[App page](https://appshunter.io/ios/app/tri-func/id496807268)

This utility app provides the formula and value for calculating triangle properties. It's designed for quick access to mathematical formulas related to triangles.

**Highlights:** Triangle formula display, Value calculation, Quick access utility, Mathematical formulas

**Features:** Vision Pro support

**In-app purchases:** none


### Cave 09

[App page](https://appshunter.io/ios/app/cave-09-survey-and-mapping/id6780136082)

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

**In-app purchases:** none


## Frequently asked questions

### Is Tri free?

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

### Is Cave 09 free?

Cave 09 is free to download, with no in-app purchases.

### Do Tri or Cave 09 have ads?

Tri shows ads; Cave 09 does not.

### Which is updated more often, Tri or Cave 09?

Tri ships an update every 12 months, and Cave 09 every 2 months. Most recently, Tri was updated on September 16, 2026 and Cave 09 on September 18, 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.*