Botrops1 / ConstraintsLens

What is ConstraintsLens?

ConstraintsLens is a Fusion 360 add-in that solves a persistent pain point: auditing sketch constraints. It docks a panel directly inside Fusion that lists every geometric constraint, dimension, and implicit endpoint join in your active sketch. You can click any row to highlight the relevant geometry, delete constraints in bulk, filter by type or label, and get instant diagnosis of whether your sketch is under-constrained, fully constrained, or over-constrained. The panel also shows properties of selected entities (length, radius, area) and lets you edit dimension values inline. Built in Python with a vanilla HTML/JS palette UI.

Why is it gaining traction?

The hook is simple: Fusion's native constraint UI is buried in tiny on-canvas glyphs that are hard to see, select, and manage. ConstraintsLens brings everything into a searchable, dockable panel with bulk operations and auto-refresh. The inline dimension editing and auto-zoom to selection are quality-of-life features that CAD users have been requesting for years. It handles 21 constraint types, 12 dimension types, and even reconstructs implicit endpoint joins that Fusion does not expose as real constraints.

Who should use this?

Mechanical engineers and product designers who work with complex sketches in Fusion 360 and need to debug constraint problems quickly. It is especially useful for parametric designs where understanding which dimensions drive which geometry matters. If you have ever spent time hunting for the source of an over-constrained error or wanted to clean up a messy sketch without clicking each constraint individually, this tool saves real time.

Verdict

ConstraintsLens fills a genuine gap in Fusion's workflow, and the feature set is solid for a niche tool. However, with only 19 stars and a 1.0% credibility score, it is early-stage software with limited community validation. The documentation is thorough and the code is well-structured, but there is no visible test suite or release cadence. Try it if you need the functionality now; keep an eye on it if you want to see it mature.