# Manifold

Hacker Approved page: https://hackerapproved.com/p/manifold/

14 people recommended Manifold in Hacker News comments, 4 had mixed feelings and 3 criticized it, November 2025 to October 2026. It was recommended in 10 of 12 months, in 15 threads. It meets the Hacker Approved badge rule.

**Verdict:** Fast, watertight boolean engine for OpenSCAD and other CAD tools. Critics say its triangle-mesh basis limits serious CAD use.

Summary written by Claude from 31 comments. It was written before the November 2026 recount, and 28 of those comments still count.

## Why people recommend it

- Much faster boolean operations than CGAL (5 comments in the sample): "Trivial operations are two orders of magnitude faster and complex ones every faster." ([source](https://news.ycombinator.com/item?id=46339112)) "The Manifold renderer is so much faster than the old CGAL" ([source](https://news.ycombinator.com/item?id=50038981)) "It will make your models “render” 10x faster (or more" ([source](https://news.ycombinator.com/item?id=46338383))
- Watertight results, handles self-intersecting meshes (3 comments in the sample): "The geometry engine is Manifold, which guarantees watertight meshes from boolean operations." ([source](https://news.ycombinator.com/item?id=46787958)) "Manifold backend also eliminates the need to avoid coincident faces." ([source](https://news.ycombinator.com/item?id=46339193)) "our library can still handle epsilon-valid self-intersecting meshes, rather than just reporting an error" ([source](https://news.ycombinator.com/item?id=49121605))
- Embedded in Godot and Blender (2 comments in the sample): "I spent a lot of time making elalish/manifold work in Godot Engine and it is now a method in Blender too." ([source](https://news.ycombinator.com/item?id=49083611)) "That's why I integrated manifold into godot engine for constructive solid geometry!" ([source](https://news.ycombinator.com/item?id=49083806))

## What people warn about

- Limits for serious CAD and manufacturing (1 comment in the sample): "Manifold is good for visualization, but to use it as an engine for manufacturing .. its limits will be hit." ([source](https://news.ycombinator.com/item?id=46788856))

## What people recommend instead

- [S2 Geometry](https://hackerapproved.com/p/s2-geometry/): 5 recommend, 1 mixed, 2 criticize

## The badge

A product earns the Hacker Approved badge when at least 10 people recommend it, recommenders outnumber critics at least 2 to 1 (mixed feelings count toward neither side), it was recommended in at least 4 of the 12 months and in at least 5 different threads, and no single thread supplies more than half of the people who recommend it. Health and money products are never badged.

## Cite as

Hacker Approved, "Manifold", https://hackerapproved.com/p/manifold/ (14 recommend, 4 mixed, 3 criticize; Hacker News comments, November 2025 to October 2026).

Counts updated 2 Nov 2026, with data through October 31, 2026.