# DecaMaps vs OSM sketch

The clearest difference is rating: OSM sketch at 4.5 against DecaMaps's 3.3. OSM sketch also leads on review sentiment (100% vs 63%) and in-app purchases (none vs 3). DecaMaps's advantage is ads (none vs shown) and update cadence (every 2 months vs every 4 months). On price, ratings volume and device support there is nothing between them.

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

OSM sketch holds the better App Store score, 4.5 against 3.3. Both are backed by a comparable volume of ratings — 3 and 2 respectively. Written reviews point the same way: 63% of DecaMaps's written reviews are positive against 100% of OSM sketch's.

DecaMaps ships an update every 2 months, OSM sketch every 4 months. The most recent releases landed on October 5, 2026 and September 19, 2026 respectively.

## The numbers

| Metric | DecaMaps | OSM sketch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.3 (3 ratings)](https://appshunter.io/ios/app/decamaps/id637384550/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/osm-sketch/id777144672/reviews)** |
| Number of ratings | **3** | 2 |
| Positive reviews | 62.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | **Every 2 months** | Every 4 months |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 11 MB | 8 MB |
| Requires iOS | **8.0** | 16.6 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [MEDIANAVI,Inc.](https://appshunter.io/developer/637384553) | [Masaki Fujimoto](https://appshunter.io/developer/777144675) |

## 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 |


### OSM sketch

[App page](https://appshunter.io/ios/app/osm-sketch/id777144672)

Draw directly on OpenStreetMap maps to create annotations and memos. Save your drawings as GPX files to upload and edit on desktop OSM editors. Ideal for planning routes or marking points of interest on the go.

**Highlights:** Draw on OSM maps, Save drawings as GPX, Upload to OSM account, Multi-touch gestures, Display current location, Zoom and scroll map

**In-app purchases:** none


## Frequently asked questions

### Is DecaMaps free?

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

### Is OSM sketch free?

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

### Which has better reviews, DecaMaps or OSM sketch?

OSM sketch is rated higher. DecaMaps averages 3.3 out of 5 from 3 ratings, while OSM sketch averages 4.5 from 2 ratings.

### Do DecaMaps or OSM sketch have ads?

OSM sketch shows ads; DecaMaps does not.

### Which is updated more often, DecaMaps or OSM sketch?

DecaMaps ships an update every 2 months, and OSM sketch every 4 months. Most recently, DecaMaps was updated on October 5, 2026 and OSM sketch on September 19, 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.*