Maps · head to head
GRASS GIS vs SW Maps
GRASS GIS
Maps
Long-running open source geospatial analysis engine for raster, vector and terrain processing
- From
- Free
- Rated
- -
SW Maps
Maps
Free Android GIS data collector that pairs with external RTK GNSS receivers
- From
- Free
- Rated
- -
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.; SW Maps android only. There is no iOS version and no sign of one, which rules it out for organisations that issue iPhones and iPads to field staff.
- They diverge on capability: GRASS GIS covers Raster analysis, SW Maps covers Custom feature layers.
- Prices and features above were last checked on 1 September 2026.
Where they differ
Only the attributes on which GRASS GIS and SW Maps actually diverge.
Identical on both: starting price (Free), pricing model (Open source, no licence fee), 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 SW Maps
- Custom feature layers
- External GNSS support
- Offline basemaps
- Geospatial PDF layers
- Vector import
- Photo and media capture
- Export formats
- NTRIP client
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 SW Maps
- A research group building a reproducible time series analysis of satellite imagery that must be rerunnable years laternot SW Maps
- An environmental agency running viewshed and solar radiation analysis for planning assessments without buying commercial GIS seatsnot SW Maps
- A QGIS user who needs a specific processing algorithm that only exists in the GRASS toolboxnot SW Maps
SW Maps
- An NGO or municipal utility mapping water points, pipe networks or road assets on a budget that cannot absorb per-user GIS subscriptionsnot GRASS GIS
- A survey team pairing a low-cost RTK receiver with Android tablets to collect centimetre-accurate attributed features without buying field software seatsnot GRASS GIS
- A university field course teaching GNSS data collection where every student needs the tool on their own devicenot GRASS GIS
- A consultant doing a one-off asset inventory who needs shapefile or GeoPackage output and does not want to start an annual subscription for a three-week jobnot 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.
SW Maps
- Android only. There is no iOS version and no sign of one, which rules it out for organisations that issue iPhones and iPads to field staff.
- There is no back end: no user management, no central project sync, no audit trail. Data lives on the device until someone exports it, and a lost tablet is lost data.
- No commercial support contract exists, so an organisation with a compliance requirement for vendor support cannot use it for regulated work regardless of technical fit.
- It is maintained by a small consultancy as a side product of its own project work, so the roadmap follows Softwel’s needs and a feature you depend on may never be prioritised.
- Form logic is basic compared with dedicated survey platforms: no meaningful skip logic, validation or multi-user assignment, so complex questionnaires quickly outgrow it.
Pricing, plan by plan
GRASS GIS
Free- GRASS GISFree
- GNU GPL licence
- All modules included
- No user or seat limits
SW Maps
Free- SW MapsFree
- All features included
- External RTK GNSS support
- Unlimited layers and exports
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.
Choose SW Maps if
- You need custom feature layers.
- You want to start without paying.
- You work on Android.
- You also want external gnss support.
Questions people ask
- Is GRASS GIS or SW Maps better?
- Neither clearly leads. GRASS GIS starts at Free and SW Maps at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
- Which is cheaper, GRASS GIS or SW Maps?
- GRASS GIS starts at Free and SW Maps at Free.
- Does GRASS GIS or SW Maps run on more platforms?
- GRASS GIS runs on Linux, Windows, macOS. SW Maps runs on Android.
- 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 SW Maps is typically brought in for.
- What can GRASS GIS do that SW Maps cannot?
- GRASS GIS covers Raster analysis, Hydrological modelling, Terrain analysis, Vector topology. SW Maps covers Custom feature layers, External GNSS support, Offline basemaps, Geospatial PDF layers.
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.
SW Maps: Is SW Maps really free?
Yes. It is free with no advertising and no paid tier. There is no subscription and no feature paywall.
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.
SW Maps: Does it support RTK receivers?
Yes, over Bluetooth or USB serial, with NTRIP correction support, antenna height and per-point fix quality recording.
GRASS GIS: Do I need to use its interface?
No. Most people run GRASS algorithms through the QGIS processing toolbox or from Python.
SW Maps: Is there an iOS version?
No. Android only.
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.
SW Maps: Who maintains it?
Softwel, an engineering consultancy in Kathmandu, Nepal, which built it for its own infrastructure projects.
SW Maps: Can we get support?
Not contractually. There is no commercial support agreement, which is the main reason organisations with compliance obligations choose a paid alternative.
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