# Triangular Lake vs Boulder Logbook

The clearest difference is device support: Triangular Lake at 3 against Boulder Logbook's 1. Triangular Lake also leads on iOS requirement (15.0 vs 18.6). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Both ship on a similar rhythm, roughly every 7 months. The most recent releases landed on September 19, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Triangular Lake | Boulder Logbook |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | Every 7 months |
| Monetization | Free | — |
| Size | 74 MB | 25 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Mikhail Barinov](https://appshunter.io/developer/910228495) | [Martin List](https://appshunter.io/developer/1160761022) |

## 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 Logbook

[App page](https://appshunter.io/ios/app/boulder-logbook/id6444243441)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Triangular Lake free?

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

### Is Boulder Logbook free?

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

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

Neither Triangular Lake nor Boulder Logbook shows ads.

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

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