Colijn++

ODB++ (Re)Viewing like it's 2026!

Colijn++ is a lightning fast and modern-looking ODB++ viewer and reviewer. It is built directly from the specification*. It runs on any platform and in the browser.
All demos on this page is Colijn++ running live in your browser.

Open the Interactive Demo

Board Overview

Quick & Easy

Colijn++ is a fast, lightweight viewer for ODB++ board files. It’s portable, so it runs wherever your team works.

Built for test engineers who need to find a component, trace a signal, or plan a rework in seconds. It’s also built for designers who want a second pair of eyes on a board without requiring them to install the full EDA suite.

Export an Interactive HTML Viewer that opens in any browser, with no Colijn++ install needed for the person you send it to. Share the file, not the setup.
  • Net Highlighting
  • Net, Pin and Component Labels
  • Distance & Trace Length Measurements
  • BOM & Stack-Up Information
  • Interactive HTML Export

Review

No more copy-pasting screenshots

  • Point & Area based comments
  • Replication of the view during comment creation
  • Organise comments by completion, severity & custom tags.
Colijn++ comes with extensive review capabilities. Reviewers can place coordinate-based comments, indicating which net was selected in what locaion.

Comments can be organised by severity and manually be tagged. Designers can track completion of the received feedback both in Colijn++ itself, as well using the Interactive HTML Export

Compare

How did you implement my feedback?

In addition to the review capabilities desribed above, Colijn++ also allows for the comparison between two sets of ODB++ files, making it easier to determine which parts of the boards were changed and how review comments were implemented.
  • Track Additions
  • Track Removals
  • Track Moves
  • Track Changes

High Performance

No lag, No Nonsense

Nets
614
Layers
6
Components
659
Features
150k+
Colijn++ is optimised for speed and fluidity. Large boards open within seconds and remain fluid, no matter how many layers you are viewing. Below is the largest freely available design I could find.

Found a bigger one, let me know!

3D

One more thing...

Colijn++ adds a 3D viewer, for when two dimensions simply aren't enough.
  • Embed STEP files along with the ODB data

Disclaimer

*This ODB++ (re)viewer was developed in good faith using best efforts to adhere to published ODB++ 8.1 specification. Whenever the specification was contradictory or unclear, the official ODB++ viewer was used to drive the implementation.

Nevertheless, this software is provided "as is," without warranty of any kind, express or implied. No guarantees, representations, or warranties are made regarding the complete accuracy, completeness, or reliability of the parsing, rendering, or visual representation of any ODB++ files.

Users are solely responsible for verifying all design data and must always confirm final manufacturing data and production files directly with their printed circuit board (PCB) manufacturer prior to production.