Alternatives to Atmos
A web-based color palette generator for UI designers, with shade scales and accessibility checks. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Atmos
A web-based color palette generator for UI designers, with shade scales and accessibility checks.
Replacements
Listings that take over the same core job as Atmos.
Coolors
Fast color palette generator for browsing and tweaking combinations.
Coolors focuses on fast palette generation with keyboard shortcuts and a large shared community, while its paid plan locks some features, similar to Atmos's freemium model.
Leonardo
Adobe's web tool for generating accessible color themes and scales from target contrast ratios.
Leonardo is Adobe's free open-source tool that builds scales from target contrast ratios and exports CSS custom properties, Design Tokens and SVG.
Realtime Colors
A web tool that previews a color palette and font pairing on a realistic page layout as you edit it.
Realtime Colors previews five color roles on a full sample site and exports to CSS, Tailwind and framework presets, with contrast checks built in.
UI Colors
A web tool that generates Tailwind CSS color shade scales from a base color and previews them.
UI Colors generates Tailwind shade scales with neutral and status colors and shadcn/ui previews, with some features behind a Pro subscription.
ColorBox
A web tool for building accessible color scales from adjustable hue, saturation and brightness curves.
ColorBox is free and gives curve-based control over hue, saturation and brightness per step, exporting to Tailwind CSS, OKLCH and Swift.
Huetone
An open-source web tool for building predictable, accessible color palettes in the LCH color space.
Huetone is free and open source, building accessible palettes in the LCH color space, though it assumes familiarity with color spaces.
Accessible Palette
A web tool for building color systems with consistent lightness and WCAG contrast across hues.
Accessible Palette is free and keeps perceived lightness consistent across hues, showing WCAG 2 and WCAG 3 contrast for each step.
Adobe Color
A free web tool from Adobe for building color palettes from harmony rules, images and accessibility checks.
Adobe Color is free with harmony rules, image extraction, a contrast checker and color blindness simulation, but no shade scale generation described.
Also worth comparing
These listings name Atmos as their own alternative, so the relationship runs both ways.
Color Supply
An interactive web color wheel for building harmonious palettes and previewing them on sample shapes.
Atmos provides an adjustable color wheel with all harmony modes plus shade scales and accessibility checks, with some features possibly needing an account.
Geenes
A browser tool for building color scales and exporting them to Sketch or code.
Atmos is a freemium palette generator with uniform shade scales, semantic status colors and accessibility checks, where some features may need an account.
Sessions College Color Calculator
A free color wheel calculator that builds color harmonies and palettes from a chosen base color.
Atmos adds a color wheel with all harmony modes plus shade scales and semantic status colors for UI work, and some features may need an account.
Similar software
Related functionality, not a direct replacement.
tints.dev
A web palette generator and API that builds 11-shade Tailwind CSS color scales from one base color.
Scale
A web tool that generates a smooth color scale from a single base color.
Material Theme Builder
Google's web tool for generating Material Design 3 color schemes from a source color.
Colorffy
A set of web tools for generating color palettes, shades, gradients and light or dark UI themes.
Paletton
A long-running web color scheme designer built around a color wheel and classic harmony rules.
