Comparison

DecaMaps vs Mountain Log Japan

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

DecaMaps

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
Read full description

Create a large detailed map at once! +++++ features +++++ - DecaMaps is an iPhone and iPad app to create a large detailed map. You can create an original map only by 2 steps. Step1. Decide an area on the map. Step2. Tap the scissor button. The area you choose is quickly drawn a large detailed map. - Easy preview You do not need to zoom in or out to the map. Your iPhone or iPad shows you a large map and a detailed map on the same screen. - Print a large map! You can print out a large poster up to 16 sheets of paper. *Supported paper size: A4/Letter/B4/B5 *Purchase a “large poster print add-on” to print a more than 4 sheets of paper (2 sheets x 2 sheets). (Ad will be removed if you purchase the add-on.) *To print posters, you need a printer that is compatible with AirPrint on the same Wi-Fi network connected with iOS device. - You can also save the map to Camera Roll. Up to 26,000,000 pixel map can be saved as an image file. *On specification of Camera Roll, saved image cannot zoom in enough, but the original image does not become depleted. Save the image to your PC and see it or view with an iPhone app that supports with high resolution image. +++++ "DecaMaps" is useful for +++++ If you print out a large map by yourself, it is very useful for below situations. - Confirm the place where you have never been before. - For pre-confirmation of travel destination or use as a travel guidebook - Print out the places where you have been to or have grown up and enjoy the sight of them - For an evacuation map, an assistant return home map - For a driving map - For check a school route for your child/children - For an event, a lecture presentation

About

Mountain Log Japan

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
Read full description

Scan your photo library and your past hikes come back to life as hiking records. Track your progress on Japan's 100 Famous Mountains at a glance. One-time purchase - no subscription. ■ WHAT'S NEW [Pick a Mountain, Pick a Course] (New!) - Open a mountain's course list from "Search by name" or from "Climb this mountain" on a mountain or hiking record. Round-trip courses from each trailhead are created automatically - Sort by course constant, course time, distance or elevation gain to find one that fits you - Check the departure time and estimated finish, then tap "Plan with this course". The route is set and the offline map around the summit is saved in one step - "Change Descent" lets you come down to a different trailhead. Opened from a hiking record, your previous route is one of the choices - The walk from the trailhead to the start of the trail counts toward course time - Start and finish points show nearby place names such as trailheads and parking lots - No course that fits? Tap trails on the map with "Create on map", or import a GPX file [Other Mountains, Closer to Home] (Updated!) - 400+ mountains beyond the famous lists, from local hills to popular peaks - New "Others" filter on the Home and 100 Peaks screens, with the mountains shown on the map - Open the mountain's page from a hiking record, with a Wikipedia link - "Mountains climbed" counts every mountain you have climbed, famous or not ■ KEY FEATURES - Trailheads: 1,500+ on the map (600+ checked against official sources), with nearby parking and bus stops as start or finish points, and directions in Apple Maps or Google Maps - Course time planning: checkpoint times, rest and departure time, expected arrival at each point, actual vs. planned, recalculated even without a signal - GPS tracking in the background, with automatic backup and recovery - Safety alerts: route deviation (voice and vibration) and sunset alerts with spoken warnings - Lock Screen and Dynamic Island: live stats and summit/descent buttons - Offline topo maps from the Geospatial Information Authority of Japan (GSI), downloadable by mountain name (zoom 12-18) - Photo Scan: detects past hikes from photo locations and dates - Checklists for 12 lists and 900+ peaks, matched against your hiking records - Statistics: monthly and yearly charts, personal bests, prefectures climbed - Highlight Card with post text by Apple Intelligence, and timelapse videos of your track - Voice memos with transcription, traverses with multiple summits - Trail search (OpenStreetMap), mountain weather, elevation profile - GPX/CSV import and export, backup and restore, iCloud Sync (Pro) - Power Saving GPS mode, Dynamic Type, metric or feet/miles ■ SUPPORTED LISTS Japan's 100, 200 and 300 Famous Mountains, plus the regional 100-mountain lists for Hokkaido, Tohoku, Kanto, Koshinetsu, Tokai, Kansai, Chugoku, Shikoku and Kyushu. ■ GREAT FOR - Choosing an autumn foliage hike that fits your fitness - Recording local hills as well as famous peaks - Planning from the parking lot or bus stop to the summit - Getting down safely before sunset and staying on route ■ FREE AND PRO The free version saves up to 3 hiking records and 3 offline map areas (limits may be raised during events). Pro is a one-time purchase that removes these limits and adds iCloud Sync. No subscription. ■ PRIVACY Your hiking records stay on your device and are never sent to the developer's servers. No account needed. Photo location data is removed when saved. With iCloud Sync on, records and photos are also stored in your own iCloud.

Screenshots

DecaMaps3 screens
Mountain Log Japan4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

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.

Scorecard3 real differences · 7 level
DecaMaps versus Mountain Log Japan: the parameters behind the verdict, then further details
ParameterDecaMapsMountain Log Japan
PriceFreeFree
Rating3.3 (3 ratings) — better—
Positive reviews62.5% of reviews—
Number of ratings3 — better—
Update frequencyEvery 2 monthsWeekly — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS8.0 — better17.0
Further details — not scored
Size11 MB133 MB
Age rating4+4+
DeveloperMEDIANAVI,Inc.Masashi Fujimoto

In-app purchases

3 purchases

DecaMaps

One-time3
  • Remove Ads$0.99
  • Large poster print(more than 4 sheets)$2.99
  • Large poster print(more than 4 sheets) and Remove Ads$3.99
None

Mountain Log Japan

No in-app purchases

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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