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Maps · head to head

AllTrails vs GRASS GIS

AllTrails logo

AllTrails

Maps

Discover the best hiking and biking trails

From
Free
Rated
-
Full reviewWebsite
GRASS GIS logo

GRASS GIS

Maps

Long-running open source geospatial analysis engine for raster, vector and terrain processing

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: AllTrails the App Store listing shows AllTrails is a free download with an in-app Pro subscription; the visible listing text does not state the Pro price, so the reader must check in-app purchases for the current rate.; GRASS GIS the location and mapset data model requires importing data into a structured database with a fixed coordinate system before analysis, which is a real barrier for anyone used to opening files directly.
  • They diverge on capability: AllTrails covers Trail discovery, GRASS GIS covers Raster analysis.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

Only the attributes on which AllTrails and GRASS GIS actually diverge.

Attributes where AllTrails and GRASS GIS differ
AttributeAllTrailsGRASS GIS
Pricing modelfreemiumOpen source, no licence fee
PlatformsIos, Android, WebLinux, Windows, macOS
Founded2010Unknown

Identical on both: starting price (Free), free tier (Yes), user rating (Not yet rated), category (Maps).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in AllTrails

  • Trail discovery
  • Offline maps
  • GPS navigation
  • Activity recording
  • Trail reviews
  • Apple Health
  • Garmin
  • Apple Watch

Only in GRASS GIS

  • Raster analysis
  • Hydrological modelling
  • Terrain analysis
  • Vector topology
  • Temporal framework
  • Image processing
  • Python API
  • QGIS integration

What people use each for

The jobs each tool is most often brought in to do.

AllTrails

  • Trail discoverynot GRASS GIS
  • Hiking navigationnot GRASS GIS
  • Outdoor fitness trackingnot GRASS GIS

GRASS GIS

  • A hydrologist delineating watersheds and modelling flow accumulation over a large digital elevation modelnot AllTrails
  • A research group building a reproducible time series analysis of satellite imagery that must be rerunnable years laternot AllTrails
  • An environmental agency running viewshed and solar radiation analysis for planning assessments without buying commercial GIS seatsnot AllTrails
  • A QGIS user who needs a specific processing algorithm that only exists in the GRASS toolboxnot AllTrails

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

AllTrails

  • The App Store listing shows AllTrails is a free download with an in-app Pro subscription; the visible listing text does not state the Pro price, so the reader must check in-app purchases for the current rate.

GRASS GIS

  • The location and mapset data model requires importing data into a structured database with a fixed coordinate system before analysis, which is a real barrier for anyone used to opening files directly.
  • The native graphical interface is dated and inconsistent compared with QGIS or ArcGIS, so most users end up running GRASS through QGIS and never learn the tool they are actually depending on.
  • There is no vendor, so contractual support, service levels and liability do not exist by default and must be arranged with an independent consultancy that may not cover your jurisdiction.
  • Cartographic output and map layout are weak relative to the analysis capability, meaning a second tool is always needed to produce a publishable map.
  • Module naming and argument conventions are idiosyncratic and long-standing, so scripts are durable but the learning curve is steep and transferable skills from other GIS packages help less than expected.

Pricing, plan by plan

AllTrails

Free
  • FreeFree
    • Trail search
    • Community reviews
    • Basic maps
  • AllTrails+$35.99/year
    • Offline maps
    • Real-time navigation
    • Trail conditions

GRASS GIS

Free
  • GRASS GISFree
    • GNU GPL licence
    • All modules included
    • No user or seat limits

Which should you pick?

Choose AllTrails if

  • You need trail discovery.
  • You want to start without paying.
  • You work on Ios, Android, Web.
  • You also want offline maps.
AllTrails review

Choose GRASS GIS if

  • You need raster analysis.
  • You want to start without paying.
  • You work on Linux, Windows, macOS.
  • You also want hydrological modelling.
GRASS GIS review

Questions people ask

Is AllTrails or GRASS GIS better?
Neither clearly leads. AllTrails starts at Free and GRASS GIS at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, AllTrails or GRASS GIS?
AllTrails starts at Free and GRASS GIS at Free.
Does AllTrails or GRASS GIS run on more platforms?
AllTrails runs on Ios, Android, Web. GRASS GIS runs on Linux, Windows, macOS.
Can I use AllTrails for free?
Both have a free tier, so you can try either at no cost before committing.
What is AllTrails best used for?
AllTrails is most often used for trail discovery, hiking navigation, outdoor fitness tracking. Of those, trail discovery and hiking navigation are not what GRASS GIS is typically brought in for.
What can AllTrails do that GRASS GIS cannot?
AllTrails covers Trail discovery, Offline maps, GPS navigation, Activity recording. GRASS GIS covers Raster analysis, Hydrological modelling, Terrain analysis, Vector topology.

Answered from the vendors’ own pages

AllTrails: Is AllTrails free to use?

AllTrails offers both free and paid membership options. The basic free tier allows users to explore trails, see maps, and access core features for discovering hiking and outdoor activities.

Source
GRASS GIS: Who maintains GRASS GIS?

An international volunteer and academic developer community under the Open Source Geospatial Foundation. It originated at the US Army Construction Engineering Research Laboratory in 1982.

AllTrails: Can I create custom routes on AllTrails?

Yes, AllTrails allows users to build and edit custom trails. The platform provides route converter tools and options to print custom maps for your own trail designs.

Source
GRASS GIS: Can I buy commercial support?

Not from a vendor. Independent consultancies in the OSGeo ecosystem offer paid support and development, and availability varies by region.

GRASS GIS: Do I need to use its interface?

No. Most people run GRASS algorithms through the QGIS processing toolbox or from Python.

GRASS GIS: Is it suitable for production use?

Yes for analysis pipelines, and it is used by agencies and research institutions. Plan for community support rather than a service level agreement.

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