Comparison

CalTopo vs Offline Map Data Generator

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

Head to head
About

CalTopo

Plan and navigate off-grid adventures with detailed offline maps and real-time weather forecasts. Trusted by professionals, this app offers seamless syncing and collaborative planning for backcountry pursuits.

Highlights
  • Offline map downloads
  • Satellite imagery
  • Route planning
  • GPS tracking
  • Weather forecasting
  • Collaborative map sharing
  • Slope angle shading
Features
Currently charting
Read full description

New on CalTopo: the CalTopo app is now satellite ready, allowing you to use many features of the app offline with satellite data! Take the best mapping app with you wherever you go with the CalTopo app for iOS. Trusted by professional mountain guides, avalanche educators, and search and rescue teams, CalTopo has all the features you need to plan your next off-grid pursuit. Seamless integration between CalTopo online and your mobile device allows you to access and update your maps no matter where you are. Any changes you make will automatically sync across all devices, making exporting and importing your latest map a thing of the past. The CalTopo app allows you to easily take your planning and navigation to the next level. Real time decision making in backcountry terrain is made easy with the ability to download maps and layers like slope angle shading to your device for offline use. Plan for conditions on your route with sun exposure, wind, precipitation and avalanche forecasts. View and track your location on the map using GPS, even if you are offline. Share maps with your teams or travel partners to plan collaboratively, and to ensure everyone has the necessary data. Monitor real time updates from the field, like your friends progress on a long outing with live tracking on shared maps. Plan and navigate your next adventure with the CalTopo App today! Map layers include: • MapBuilder Topo, Hybrid and Overlay • Forest Service Maps • Scanned Topos • Global Imagery • Shaded Relief • Slope Angle Shading (including high resolution elevation data where available) • Parcel data • Public Lands • Weekly Satellite Imagery • NAIP Satellite Imagery • Sun Exposure • Marine Charts • Weather Forecasting (including wind, precipitation, and temperatures) • Snow and Water Gauge Data • Fire History/Activity • And many more Support and Feature Requests: Email us at help@caltopo.com.

About

Offline Map Data Generator

Features
Read full description

Discover the Ultimate Mapping Experience with Tech Maven Geospatial Unleash the power of geospatial data with Tech Maven Geospatial, your all-in-one mapping solution available now on iOS! Whether you're a seasoned explorer, a professional in the field, or an enthusiast, our app provides unparalleled features to elevate your mapping endeavors. Key Features: 1. Seamless Data Access: Download online mapping URLs, including dynamic and cached mapping services and tile layers. Access ESRI MapServer, FeatureServer, ImageServer, VectorTileServer, PBF/MVT XYZ Vector Tile URLs, OGC API Tiles/XYZ/TMS, and more. Future versions will include downloading capabilities from other providers (OGC WFS/OGC API Features, OGC WMS/OGC API Maps, OGC WMTS). 2. Pre-configured Tile Layers and Conversion Tools: Support for pre-configured tile layers and the ability for ATAK/WINTAK users to import tile.xml configurations. In-app Vector Data Converter: Convert GIS Vector Data to optimized formats like MBTILES Vector Tiles, GPKG Vector Features, GeoJSON, or KML. Compatible with various file formats including ESRI FileGDB, Shapefile, MapInfo, GPX, CSV, and more. 3. Live Event Driven Data Feeds: Stay updated with live data feeds from ESRI FeatureServer, Network Link KML, and GeoRSS Feeds. Download data at specified frequencies and convert to GeoJSON (convertible to KML in-app for ATAK or iTAK). 4. Data Visualization and Sharing: Visualize downloaded data and user-loaded data in the Map Viewer. Supports GeoJSON, raster tiles from MBTILES and GPKG, and vector tiles from MBTILES. 5. Access Tech Maven Geospatial’s Data APIs: Explore our optional purchases to access Tech Maven Geospatial’s data APIs, offering pre-staged data, AOI (Area of Interest/Operation) APIs, Digital Elevation Model Downloaders, and more. Please note: Users are responsible for the terms of use/service and access to the data they download from the provided URLs. For detailed terms and conditions, please refer to our End User License Agreement (EULA): https://offlinedatadownloader.techmaven.net/eula/ Download Tech Maven Geospatial today and embark on your mapping journey with confidence and precision!

Screenshots

CalTopo4 screens
Offline Map Data Generator4 screens

Verdict

The call

The clearest difference is in-app purchases: CalTopo at none against Offline Map Data Generator's 6. CalTopo also leads on update cadence (every 2 weeks vs every 7 months) and chart position (#150 vs unranked). Offline Map Data Generator's advantage is iOS requirement (14.0 vs 16.0). On price, ads 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. Offline Map Data Generator sells 6 in-app purchases, starting at $19.99 per year. CalTopo asks for nothing beyond the download.

UpkeepUpdate frequency

CalTopo ships an update every 2 weeks, Offline Map Data Generator every 7 months. The most recent releases landed on October 18, 2026 and September 22, 2026 respectively.

Scorecard4 real differences · 7 level
CalTopo versus Offline Map Data Generator: the parameters behind the verdict, then further details
ParameterCalTopoOffline Map Data Generator
PriceFreeFree
Rating4.8 (7.5K ratings) — better—
Positive reviews56.5% of reviews—
Number of ratings7.5K — better—
Update frequencyEvery 2 weeks — betterEvery 7 months
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
Best chart rank#150 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.014.0 — better
Further details — not scored
Size165 MB187 MB
Age rating4+17+
DeveloperCalTopo LLCTech Maven GeoSpatial LLC

Bugs and requests

CalTopo

Reported bugs

4 issues
  • Trails and tracks disappearing
  • Coordinate display issues
  • Frequent app crashes and freezes
  • Incompatibility with older devices

Requested features

5 requests
  • Add 3D map view
  • Implement route snapping to trails
  • Improve offline map download capabilities
  • Add photo geotagging functionality
  • Implement course-up map orientation

Offline Map Data Generator

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

CalTopo

No in-app purchases

6 purchases

Offline Map Data Generator

Subscriptions6
  • App Subscription7 Days trial$19.991 Year
  • OMDG Elevate API7 Days trial$24.991 Year
  • OMDG Vector Conversion API7 Days trial$24.991 Year
Show 3 more
  • OMDG DEM Downloader$24.997 Days
  • Geo Request AOI$49.997 Days
  • Offline Map Data Generator7 Days trial$999.991 Year

Questions

Is CalTopo free?
CalTopo is free to download, with no in-app purchases.
Is Offline Map Data Generator free?
Offline Map Data Generator is free to download, with in-app purchases available.
Do CalTopo or Offline Map Data Generator have ads?
Neither CalTopo nor Offline Map Data Generator shows ads.
Which is updated more often, CalTopo or Offline Map Data Generator?
CalTopo ships an update every 2 weeks, and Offline Map Data Generator every 7 months. Most recently, CalTopo was updated on October 18, 2026 and Offline Map Data Generator on September 22, 2026.

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