Free + paid plan

PartForge

Describe a part in words, a photo or a sketch and get parametric CAD with sliders, exported as STL, 3MF or STEP

PartForge is a freemium browser tool for functional parts without learning CAD. Free plan with some weekly AI usage; Starter $20/month or $200/year, Pro $100/month or $1,000/year; or bring your own API key. Exports STL, 3MF and STEP; an account is needed to download. Last checked 6 October 2026.

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Opens partforge.ai

At a glance

Price: Free plan with some weekly AI usage; Starter $20/month or $200/year, Pro $100/month or $1,000/year; or bring your own API key
Runs on: Browser
Exports: STL, 3MF, STEP
Multicolor: No, single color
Account: Required to download
Open source: No
Skill level: Easy: a few settings to tune
Best for: Functional parts without learning CAD
Selling prints: Allowed The terms say you own the parts and files you create; a remixed public forge keeps the license its author chose.
How we checked: Read the tool page and docs Home, plans, terms and public forge pages read; the app asks for an email sign-in before generating, so no part was made; found through a Hacker News post (Oct 2026)
Last checked: 6 October 2026

Open generator

Sources: PartForge home, PartForge plans, PartForge terms of use (checked 6 October 2026)

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What is PartForge?

PartForge, made by Pixite, is a browser CAD tool you talk to. You describe a part in plain words, or drop in a photo, a sketch or a 3D file, and an AI assistant builds real parametric geometry with a live 3D view. Every dimension becomes an adjustable slider, so changing one number updates the whole part, and you keep refining it by asking for changes in the chat.

Finished parts are called forges and export as STL, 3MF or STEP. A public library of community forges, browsable without an account, holds parts like a propeller with adjustable blade count and twist, a stackable storage container, an enclosure and a planetary gear desk toy. Each published forge carries the license its author chose, and you can remix it or clone its code.

Generating needs an account: you sign in with an email link and must be 18 or older. The free plan has no card and includes some AI usage each week; Starter costs $20 a month ($200 a year) and Pro $100 a month ($1,000 a year) for higher limits. On any plan you can connect your own Anthropic, OpenAI or OpenRouter API key and pay the provider directly. The plans page does not say how many generations each tier gets. The terms note that generated dimensions and tolerances are suggestions, not verified engineering, so check a part before you print it. It suits makers who want functional parts without learning CAD.