# Triangular Lake vs Boulder Twist

The clearest difference is price: Triangular Lake at Free against Boulder Twist's $9.99. Triangular Lake also leads on in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Triangular Lake is free to download; Boulder Twist costs $9.99 up front. Boulder Twist sells 3 in-app purchases, starting at $0.99 per 7 days. Triangular Lake asks for nothing beyond the download.

Triangular Lake ships an update every 7 months, Boulder Twist every 48 months. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Triangular Lake | Boulder Twist |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 7 months** | Every 48 months |
| Monetization | Free | — |
| Size | 74 MB | 34 MB |
| Requires iOS | **15.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Barinov](https://appshunter.io/developer/910228495) | [Miguel Correia](https://appshunter.io/developer/615904704) |

## What reviewers say

### Triangular Lake

[App page](https://appshunter.io/ios/app/triangular-lake/id910228492)

This mobile guidebook helps bouldering enthusiasts find and understand climbing problems at Lietlahti and Triangular Lake. It features detailed information on sectors, problem lines with photos, grades, danger levels, and spotting tips. An offline map and search filters enhance navigation and problem selection.

**Highlights:** Bouldering problem search, Detailed problem descriptions, Photos of climbing lines, Offline map for navigation, Search filters, Spotting tips

**Features:** macOS Compatibility

**In-app purchases:** none


### Boulder Twist

[App page](https://appshunter.io/ios/app/boulder-twist/id1241766532)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $0.99 | per 7 days |
| Yearly | $6.99 | per year |
| Lifetime | $24.99 | one-time |


## Frequently asked questions

### Is Triangular Lake free?

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

### Is Boulder Twist free?

Boulder Twist costs $9.99, and also offers in-app purchases.

### Do Triangular Lake or Boulder Twist have ads?

Boulder Twist shows ads; Triangular Lake does not.

### Which is updated more often, Triangular Lake or Boulder Twist?

Triangular Lake ships an update every 7 months, and Boulder Twist every 48 months. Most recently, Triangular Lake was updated on September 19, 2026 and Boulder Twist on September 17, 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.*