GRASS vs Propeller (2026): Pricing, Features & Verdict
Propeller is our pick, scoring 6.8/10 against 6.5/10 for GRASS on our Industrial & Infrastructure Software criteria. Its biggest advantage: higher Ease of Use score (8/10 vs 3/10). Only GRASS has a free plan.
Last updated: November 2026
GRASS
6.5/10
Free, open-source geospatial processing engine for raster, vector, imagery, lidar and time-series analysis, used by researchers, governments and engineering teams.
Propeller
6.8/10
Propeller is a cloud 3D mapping and survey analytics platform. It turns drone and GNSS data into measurable site models for earthworks, construction, mining and aggregates teams.
Feature-by-Feature Comparison
| Feature | | |
|---|---|---|
| Scores | ||
| Overall Rating | 6.5/10 | 6.8/10 |
| Integration | 7/10 | 7/10 |
| Security | 4/10 | 7/10 |
| Support | 4/10 | 7/10 |
| Cost | 10/10 | 4/10 |
| Analytics | 9/10 | 8/10 |
| Ease of Use | 3/10 | 8/10 |
| Customization | 9/10 | 5/10 |
| Scalability | 7/10 | 7/10 |
| Pricing | ||
| Free plan | Yes | No |
| Cheapest paid plan | Contact for pricing | Contact for pricing |
| Estimated cost for 10 users | Free Open source | Contact for pricing |
| Features | ||
| Drone Inspection | ||
| GIS and Mapping | ||
| LiDAR Processing | ||
| Digital Twin | Not listed | |
| Document Control | Not listed | |
| Engineering Design | Not listed | |
| Inspection Automation | Not listed | |
| Spare Parts Inventory | Not listed | |
| Work Orders | Not listed | |
GRASS vs Propeller cost by team size
| Team size | GRASS | Propeller |
|---|---|---|
| 1 user | FreeOpen source | Contact for pricing |
| 5 users | FreeOpen source | Contact for pricing |
| 10 users | FreeOpen source | Contact for pricing |
| 25 users | FreeOpen source | Contact for pricing |
| 50 users | FreeOpen source | Contact for pricing |
The plan that fits each team size, billed monthly, before add-ons and usage charges. Each cost opens that tool's pricing calculator for the team size.
Who GRASS and Propeller suit
| Audience | GRASS | Propeller |
|---|---|---|
| Engineering Firms | 6/10It offers strong hydrology, terrain, and lidar analysis, but has no design or asset features, and staff must learn command-line workflows. | 6/10It has survey and engineering industry pages and offers preliminary CAD design on terrain. |
| Construction | Not rated | 9/10Propeller is built around earthworks progress, cut and fill, and design-versus-reality comparison for civil contractors. |
| Consultancies | 7/10Environmental and geospatial consultancies can run reproducible analyses without paying licence fees. | Not rated |
| Developers | 8/10Python, C, and R APIs, JSON output, and the new grass.tools package make it easy to embed in pipelines. | Not rated |
| Drone Service Providers | Not rated | 7/10It processes drone imagery and LiDAR, and its AeroPoints make ground control easier for survey pilots. |
| Education | 9/10Universities such as NC State help develop it, and it is free with extensive tutorials and Jupyter support. | Not rated |
| Field Teams | Not rated | 7/10Foremen and field crews get mobile access, and DirtMate supports grade checks and stakeout. |
| Government | 8/10It came from US Army land management work and is used for environmental and terrain modeling, at no licence cost. | Not rated |
| Operations Teams | Not rated | 6/10Quarry and mine managers use it to track stockpile inventory over time. |
| Utilities | 4/10It is useful for terrain and network analysis, but has no utility asset registry, field apps, or maintenance workflows. | Not rated |
Which One Should You Choose?
Why choose GRASS
- Has a free plan (Propeller does not)
- Higher Cost score (10/10 vs 4/10)
- Higher Customization score (9/10 vs 5/10)
Why choose Propeller
- Higher Ease of Use score (8/10 vs 3/10)
- Higher Security score (7/10 vs 4/10)
Pros & Cons
GRASS
Pros
- Free under the GPL with no user or seat limits, so it can be installed across a whole organisation at no cost.
- Very deep analysis toolset, with more than 500 core tools for hydrology, terrain, 3D voxel, imagery classification, and spatio-temporal analysis.
- Highly scriptable through Python (including the new grass.tools API in 8.5), Jupyter, R via rgrass, and JSON output, which suits automated pipelines.
- Runs inside QGIS through the Processing toolbox, so QGIS users can call GRASS tools without switching applications.
- Version 8.5 parallelized r.mapcalc and added OpenMP to more tools, which speeds up large raster jobs on multi-core machines.
- Over four decades of continuous development, with an active release schedule and NumFOCUS fiscal sponsorship.
Cons
- Reviewers on Capterra and GISGeography report a steep learning curve and a clunky interface with awkward toolbar placement.
- Cartographic layout is weak. GISGeography calls it unsuitable for producing finished maps.
- Its project and location structure ties each project to a single coordinate system, unlike the on-the-fly reprojection in QGIS or ArcGIS.
- No vendor service-level agreement. Support comes from community forums or from third-party firms whose prices are not published.
- It has no asset registry, work orders, mobile field app, or maintenance features for infrastructure operations.
Propeller
Pros
- Combines drone, LiDAR, GNSS rover and total station data on a single map, regardless of which hardware captured it.
- AeroPoints give survey-grade ground control without the manual surveying normally needed to set control points.
- Strong stockpile, cut and fill, and progress tooling, with a long track record in earthworks and aggregates.
- Integrates with common construction systems such as Procore, Trimble Connect, Autodesk Build and HCSS.
- The trust center shows a SOC 2 Type 2 attestation.
Cons
- No published software pricing, so buyers have to request a quote.
- Hardware such as AeroPoints and DirtMate adds separate costs on top of the software.
- Reviewers find less depth for vertical construction and interior fitout work.
- Some reviewers say the price may seem high to smaller clients.
Not sold on either?
Air Inspection Automation (AiA)Our product
Plans DJI drone inspection missions for power line towers from LiDAR scans: it finds the towers, places photo stops, checks clearance, and splits the route into battery flights.
Made by the team behind b stack radar. Shown here because it fits this topic. It is not part of our rankings. How we rank tools
Frequently Asked Questions
Propeller scores higher on our Industrial & Infrastructure Software criteria: 6.8/10 against 6.5/10 for GRASS. The largest gap is in Cost: 10/10 for GRASS and 4/10 for Propeller.
GRASS has a free plan; Propeller does not list one.
