FREEWAT vs PFLOTRAN

FREEWAT8.7Visit PFLOTRAN8.0Visit

Higher score FREEWAT #2 in Groundwater Modeling Software 8.7/10 Free plan Free plan✓ 3 of 3 features Visit FREEWAT

vs

PFLOTRAN #5 in Groundwater Modeling Software 8.0/10 Open source ✓ 1 of 3 features Visit PFLOTRAN

• FREEWAT fits best

  GIS-centered modeling and water-management workflows

• PFLOTRAN fits best

  Large-scale reactive transport and fractured media

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Side by side

Feature	FREEWAT 8.7/10 Visit ↗	PFLOTRAN 8.0/10 Visit ↗
At a glance
Editor score	8.7	8.0
Ranking	#2 in Groundwater Modeling Software	#5 in Groundwater Modeling Software
Best for	GIS-centered modeling and water-management workflows	Large-scale reactive transport and fractured media
Pricing model	Free	Free
Starting price	Free plan	Open source
Free plan	✓ (best)	Not checked yet
Free trial	—	—
Deployment	Desktop	Self-hosted
Platforms	Windows, Linux	Linux
Support	Community, Docs	Docs
Built for	Small business, Mid-market, Enterprise	Small business, Mid-market, Enterprise
Features FREEWAT 3/3 · PFLOTRAN 1/3
Transport modeling	✓	✓
Surface-water coupling	✓ (best)	Not checked yet
GIS data exchange	✓ (best)	Not checked yet
Specs
Flow modeling method	Not checked yet	Other
Model dimensions	Not checked yet	3d
Supported platforms	Windows, Linux (macOS via Windows/Linux virtual machine)	Linux
Our review
Pros	Combines MODFLOW-family flow modeling with solute and density-dependent transport. Connects groundwater and surface-water interaction modeling with QGIS. Includes calibration, sensitivity analysis and water-management planning tools.	Combines groundwater flow with reactive transport and geochemical reactions Parallel execution supports large-scale scientific simulations Models both porous and fractured subsurface media
Cons	The current plugin is installable on Windows and Linux only. Its workflow is delivered through the QGIS desktop GIS plugin. Support channels are community and documentation.	Linux is the only listed platform Self-hosted deployment requires managing the computing environment Documentation is the listed support channel
Our verdict	FREEWAT is a free, open-source modeling environment delivered as a plugin for the QGIS desktop GIS. It is intended for engineering and geoenvironmental companies, water and river-basin authorities, environmental agencies, universities, and… Read the review →	PFLOTRAN is an open-source simulation code for subsurface groundwater flow and reactive transport. It is aimed at researchers and technical teams constructing numerical models of groundwater movement, dissolved chemical species, and… Read the review →

Strengths and trade-offs

• FREEWAT — where it wins

  • Combines MODFLOW-family flow modeling with solute and density-dependent transport.
  • Connects groundwater and surface-water interaction modeling with QGIS.
  • Includes calibration, sensitivity analysis and water-management planning tools.

  Where it doesn't

  • The current plugin is installable on Windows and Linux only.
  • Its workflow is delivered through the QGIS desktop GIS plugin.
  • Support channels are community and documentation.

• PFLOTRAN — where it wins

  • Combines groundwater flow with reactive transport and geochemical reactions
  • Parallel execution supports large-scale scientific simulations
  • Models both porous and fractured subsurface media

  Where it doesn't

  • Linux is the only listed platform
  • Self-hosted deployment requires managing the computing environment
  • Documentation is the listed support channel

• FREEWAT8.7/10 · Free plan

  A free, GIS-centered modeling environment spanning groundwater simulation, analysis and planning.

  Visit FREEWATFull verdict →
• PFLOTRAN8.0/10 · Open source

  A parallel, open-source engine for large 3D groundwater and geochemical simulations.

  Visit PFLOTRANFull verdict →