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Maps · head to head

GRASS GIS vs OpenRouteService

GRASS GIS logo

GRASS GIS

Maps

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

From
Free
Rated
-
Full reviewWebsite
OpenRouteService logo

OpenRouteService

Maps

Open-source routing, geocoding, and isochrone APIs based on OpenStreetMap data for developers and enterprises

From
Free
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: 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.; OpenRouteService free tier limited to 500 Isochrones requests per day
  • They diverge on capability: GRASS GIS covers Raster analysis, OpenRouteService covers Core Functionality.
  • Prices and features above were last checked on 1 September 2026.

Where they differ

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

Attributes where GRASS GIS and OpenRouteService differ
AttributeGRASS GISOpenRouteService
Pricing modelOpen source, no licence feefreemium
PlatformsLinux, Windows, macOSWeb

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 GRASS GIS

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

Only in OpenRouteService

  • Core Functionality
  • User Interface

What people use each for

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

GRASS GIS

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

OpenRouteService

  • Directions routing for cars, trucks, bikes, walking, hiking, wheelchairnot GRASS GIS
  • Reachability analysis with isochrones for time and distance calculationsnot GRASS GIS
  • Many-to-many distance matrix calculationsnot GRASS GIS
  • Location geocoding and conversion to coordinatesnot GRASS GIS
  • Points of interest discovery and mappingnot GRASS GIS
  • Elevation data enrichment using SRTM satellite datanot GRASS GIS
  • Vehicle routing problem optimizationnot GRASS GIS

Where each one falls short

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

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.

OpenRouteService

  • Free tier limited to 500 Isochrones requests per day
  • API restrictions exist but details not fully documented on main page
  • Specific pricing tiers and costs not published on primary website

Pricing, plan by plan

GRASS GIS

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

OpenRouteService

Free

No published plan breakdown. See the OpenRouteService review.

Which should you pick?

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

Choose OpenRouteService if

  • You need core functionality.
  • You want to start without paying.
  • You also want user interface.
OpenRouteService review

Questions people ask

Is GRASS GIS or OpenRouteService better?
Neither clearly leads. GRASS GIS starts at Free and OpenRouteService at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, GRASS GIS or OpenRouteService?
GRASS GIS starts at Free and OpenRouteService at Free.
Does GRASS GIS or OpenRouteService run on more platforms?
GRASS GIS runs on Linux, Windows, macOS. OpenRouteService runs on Web.
Can I use GRASS GIS for free?
Both have a free tier, so you can try either at no cost before committing.
What is GRASS GIS best used for?
GRASS GIS is most often used for a hydrologist delineating watersheds and modelling flow accumulation over a large digital elevation model, a research group building a reproducible time series analysis of satellite imagery that must be rerunnable years later, an environmental agency running viewshed and solar radiation analysis for planning assessments without buying commercial gis seats, a qgis user who needs a specific processing algorithm that only exists in the grass toolbox. Of those, a hydrologist delineating watersheds and modelling flow accumulation over a large digital elevation model and a research group building a reproducible time series analysis of satellite imagery that must be rerunnable years later are not what OpenRouteService is typically brought in for.
What can GRASS GIS do that OpenRouteService cannot?
GRASS GIS covers Raster analysis, Hydrological modelling, Terrain analysis, Vector topology. OpenRouteService covers Core Functionality, User Interface.

Answered from the vendors’ own pages

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.

OpenRouteService: How much does OpenRouteService cost?

OpenRouteService is free to use and open source. The free tier includes up to 500 Isochrones requests per day. Specific pricing for higher usage tiers is not published on the main pricing page.

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.

OpenRouteService: Is there a free version of OpenRouteService?

Yes, OpenRouteService is completely free to use and built on open source technology. All services are presented as free to use and based on user-generated and collaboratively collected geographic data from OpenStreetMap.

Source
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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