# DecaMaps vs Mountain Log Japan

The clearest difference is in-app purchases: Mountain Log Japan at none against DecaMaps's 3. Mountain Log Japan also leads on update cadence (weekly vs every 2 months). DecaMaps's advantage is iOS requirement (8.0 vs 17.0). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. DecaMaps sells 3 one-off in-app purchases. Mountain Log Japan asks for nothing beyond the download.

DecaMaps ships an update every 2 months, Mountain Log Japan weekly. The most recent releases landed on October 23, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | DecaMaps | Mountain Log Japan |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.3 (3 ratings)](https://appshunter.io/ios/app/decamaps/id637384550/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 62.5% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 11 MB | 133 MB |
| Requires iOS | **8.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MEDIANAVI,Inc.](https://appshunter.io/developer/637384553) | [Masashi Fujimoto](https://appshunter.io/developer/1894813603) |

## What reviewers say

### DecaMaps

[App page](https://appshunter.io/ios/app/decamaps/id637384550)

Easily create large, detailed maps from a selected area. Preview maps on a single screen and print them up to poster size. Save maps as high-resolution images to your device.

**Highlights:** Create large detailed maps, Select area and tap button, Easy preview on one screen, Print maps up to poster size, Save maps to Camera Roll, Supports A4/Letter/B4/B5 paper sizes

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |
| Large poster print(more than 4 sheets) | $2.99 | one-time |
| Large poster print(more than 4 sheets)  and Remove Ads | $3.99 | one-time |


### Mountain Log Japan

[App page](https://appshunter.io/ios/app/mountain-log-japan/id6762605490)

Record your mountain climbs with GPS tracking, offline maps, weather forecasts, and detailed statistics. Share your adventures on social media with AI-generated posts and capture moments with voice memos. Safely track your progress and receive alerts for sunset and route deviations.

**Highlights:** GPS tracking and offline maps, Hundred Famous Mountains checklist, Mountain weather forecasts, AI-powered social media sharing, Voice memo recording and transcription, Backup and restore functionality, Sunset and descent time alerts

**In-app purchases:** none


## Frequently asked questions

### Is DecaMaps free?

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

### Is Mountain Log Japan free?

Mountain Log Japan is free to download, with no in-app purchases.

### Do DecaMaps or Mountain Log Japan have ads?

Neither DecaMaps nor Mountain Log Japan shows ads.

### Which is updated more often, DecaMaps or Mountain Log Japan?

DecaMaps ships an update every 2 months, and Mountain Log Japan weekly. Most recently, DecaMaps was updated on October 23, 2026 and Mountain Log Japan on October 15, 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.*