Free + paid plan Multicolor No account needed

ColorStack

Browser filament painting with 3MF export, plus flat multicolor and image to STL

ColorStack is a freemium browser tool for browser-based multicolor art prints. Free tier with STL export, up to 8 color layers and daily limits; Pro subscription for 3MF export and unlimited layers (price shown at checkout). Exports STL and 3MF; no account needed. Last checked 25 September 2026.

Open ColorStack See alternatives

Opens colorstack.app

At a glance

Price: Free tier with STL export, up to 8 color layers and daily limits; Pro subscription for 3MF export and unlimited layers (price shown at checkout)
Runs on: Browser
Exports: STL, 3MF
Multicolor: Yes
Account: Not needed
Open source: No
Skill level: Easy: a few settings to tune
Best for: Browser-based multicolor art prints
How we checked: Opened the generator App opened without signing in; upload takes PNG, JPEG or BMP up to 10 MB, and the free tier stops at 8 color layers
Checked by: Mike Janssen
Last checked: 25 September 2026

Open generator

Sources: ColorStack pricing, ColorStack filament painting tool (checked 25 September 2026)

Something out of date? Let us know

Made ColorStack? Get the listing badge

What is ColorStack?

ColorStack is a browser app for multicolor printing from images. Its main mode builds HueForge-style color layers: you upload artwork, choose the number and thickness of layers, match your filaments to a suggested palette, preview the blend and export. It targets single-extruder owners who swap filament by hand as well as multi-material setups.

The same app includes FlatStack for flat multicolor plates, where each color is its own region rather than a blended layer, an image to STL converter, and a lithophane mode called LithoStack. The Pro plan adds one-click 3MF export with printer profiles, which saves setting the swaps by hand in the slicer.

The free tier runs in the browser with STL export, up to 8 color layers and daily export limits. Pro is a subscription paid through Stripe after sign-in and unlocks unlimited layers and exports. It suits makers who want a modern web tool that covers both blended and flat multicolor prints.