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PVSio-Web

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What PVSio-Web is

PVSio-Web is a free, open-source web toolkit for creating and analyzing interactive human-machine interface prototypes. It builds prototypes from formal models and uses the PVS theorem proving system for analysis together with PVSio for simulation. Its Prototype Builder lets developers define a device interface image and place interactive input and output areas over it. The Simulator View converts actions into PVS expressions, evaluates them, and displays returned expressions in the prototype. EmuCharts supports drawing model states and transitions and generating formal models such as PVS and VDM-SL. A Model Editor provides syntax highlighting, autocomplete, search, file browsing, and PVS editing and type-checking tools. Supported verification tools include PVS, IVY, NuSMV, NuXMV, VDM/Overture, and MathWorks Simulink. The project reports medical-device analysis for design anomalies that could lead to use errors. The live web version cannot save changes, and some prototypes require PVS v7.1.

Who it suits

PVSio-Web suits developers and analysts building model-based interface prototypes on the web. It is relevant to teams working with formal verification, simulation, or medical-device interface analysis.

What it does well

  • Free and open source
  • Creates interactive prototypes from formal models
  • Includes simulation and formal analysis tools
  • Supports several verification toolchains
  • Provides model and widget editors

What to know first

  • Live version cannot save changes
  • Some prototypes require PVS v7.1
  • Library use requires PVS scripts on PATH

Limits

The live web version uses a read-only file system, so changes made there cannot be saved. Some prototypes require PVS v7.1, and library use depends on the PVS distribution scripts being available on PATH.

Getting started

  1. Open the PVSio-Web website
  2. Use the live web toolkit for browser-based work
  3. Install VSCode-PVS from the Visual Studio Code Marketplace
  4. Install PVS and place pvs, pvsio, and proveit on PATH when using it as a library
  5. Use PVS v7.1 when executing prototypes that require it

Verdict

PVSio-Web combines interface prototyping with formal modeling, simulation, and verification workflows. Its read-only live version and PVS requirements matter when choosing how to use it.

Questions

Is PVSio-Web free?

Yes. It is free and open source, and the project website states that it uses the GPLv3 license.

Which platforms does it support?

PVSio-Web is available as a web toolkit. Its latest version is integrated into VSCode-PVS through the Visual Studio Code Marketplace.

What verification tools can it work with?

The project lists PVS, IVY, NuSMV, NuXMV, VDM/Overture, and MathWorks Simulink.

Can it create formal models?

Yes. EmuCharts can draw states and transitions and generate models such as PVS and VDM-SL.

Can the live version save files?

No. The live toolkit has a read-only file system, so changes cannot be saved there.

What is required for library use?

The PVS distribution's pvs, pvsio, and proveit scripts must be on PATH.

Facts from PVSio-Web's own pages

Analysis and simulation
The toolkit uses the PVS theorem proving system for analysis and PVS-io for simulation. · github.com, 11 Oct 2026
Conditional logic
Yes · pvsioweb.org, 20 Sept 2026
Current distribution
The project README says the latest version is integrated in VSCode-PVS and available from the Visual Studio Code Marketplace. · github.com, 11 Oct 2026
Dependency
The README says PVS v7.1 is needed to execute some PVSio-Web prototypes. · github.com, 11 Oct 2026
Formal analysis and simulation
The toolkit uses the PVS theorem proving system for analysis and PVSio for simulation. · github.com, 11 Oct 2026
Integration
The latest version is integrated in VSCode-PVS, available from the Visual Studio Code Marketplace. · github.com, 11 Oct 2026
Integrations
The project lists PVS, IVY, NuSMV, NuXMV, VDM/Overture, and MathWorks Simulink among verification tools supported by PVSio-Web. · pvsioweb.org, 11 Oct 2026
Interaction simulation
The Simulator View translates user actions into PVS expressions, evaluates them in PVSio, and renders returned expressions in the prototype. · pvs.csl.sri.com, 11 Oct 2026
Interactive prototypes
Yes · pvsioweb.org, 20 Sept 2026
Library setup
Using PVSio-Web as a library requires the PVS distribution's pvs, pvsio, and proveit scripts on PATH. · github.com, 11 Oct 2026
License
The project website states that PVSio-Web is licensed under GPLv3. · pvsio-web-581c51192c6e.herokuapp.com, 11 Oct 2026
Live version limit
The live web version has a read-only file system, so changes cannot be saved. · github.com, 11 Oct 2026
Live version limitation
The project README says its live toolkit has a read-only file system, so changes cannot be saved there. · github.com, 11 Oct 2026
Medical-device use
The project says PVSio-Web has been used to analyze medical devices for latent design anomalies that could lead to use errors. · github.com, 11 Oct 2026
Model-based prototypes
It generates and evaluates interactive prototypes based on formal models. · pvsio-web-581c51192c6e.herokuapp.com, 11 Oct 2026
Model editing
The Model Editor includes syntax highlighting, autocomplete, search, a file browser, and tools to edit and type-check PVS files. · pvs.csl.sri.com, 11 Oct 2026
Platform support
web · pvsioweb.org, 20 Sept 2026
Prototype creation
Its Prototype Builder lets developers define a device interface picture and add interactive overlay areas for input and output widgets. · pvs.csl.sri.com, 11 Oct 2026
Purpose
PVSio-Web is a graphical toolkit for rapidly prototyping and analyzing human-machine interfaces using Web technologies. · github.com, 11 Oct 2026
Supported tools
The project lists PVS, IVY, NuSMV, NuXMV, VDM/Overture, and MathWorks Simulink as verification tools supported by PVSio-Web. · pvsio-web-581c51192c6e.herokuapp.com, 11 Oct 2026
Technical assistance
The project site directs users seeking technical assistance to contact Paolo Masci or Patrick Oladimeji. · pvsio-web-581c51192c6e.herokuapp.com, 11 Oct 2026
Use cases
The project says PVSio-Web has been used to analyze medical devices and identify design anomalies that could lead to use errors. · github.com, 11 Oct 2026
Version requirement
PVS v7.1 is needed to execute some PVSio-Web prototypes. · github.com, 11 Oct 2026
Visual modeling
The EmuCharts Editor supports drawing model states and transitions and generating formal models such as PVS and VDM-SL. · pvs.csl.sri.com, 11 Oct 2026

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