ColorBox alternative

The ColorBox alternative for complete UI palettes

ColorBox pioneered curve-based color scales. Atmos builds on the same idea, easing curves in a perceptual color space, and wraps it in a complete palette workflow with contrast checking, Figma sync, and versioning.

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Why designers switch from ColorBox to Atmos

If you like ColorBox, you already believe in curve-driven scales. Atmos keeps that model and fixes what surrounds it.

Perceptual color space, not HSB curves

ColorBox interpolates hue, saturation, and brightness curves. Atmos generates scales in OKLCH, a perceptually uniform color space, so equal steps genuinely look equal without you compensating through curve tweaks.

The whole palette, not one scale at a time

Atmos manages brand colors, neutral grays, and semantic status colors as one system, generated from a single primary color and kept consistent across every scale.

Contrast against real pairings

ColorBox shows contrast ratios against white. Atmos checks any foreground and background pair across your palette, with both WCAG 2 and APCA, and simulates color blindness so you see what every user sees.

A workspace with memory

Atmos saves your palettes with version history and shared access, so iterations are safe, traceable, and visible to your whole team, and the Figma plugin keeps design files in sync.

Atmos vs ColorBox at a glance

Feature	Atmos	ColorBox
Curve-based shade generation
Full palette management (brand, neutrals, status)
Color generator & harmony wheel
Contrast checking	Any pair, WCAG 2 & APCA	Ratios vs white
Color vision simulator
Tailwind CSS export
Style Dictionary export
Version history & shared palettes
Free to try	14-day trial + web demos	Free

Other differences

Curves are the right idea. The color space matters too.

ColorBox deserves credit for popularizing easing curves as the way to build color scales, and its curve editor is still a satisfying tool. But curves over hue, saturation, and brightness inherit the flaws of HSB: the same lightness value looks wildly different across hues, so scales need constant manual correction.

Atmos applies easing curves inside OKLCH, where lightness matches human perception. Your curves shape the character of the scale while the color space guarantees its uniformity, the best of both.

Generate curve-based shades in Atmos

From single scales to a color system

ColorBox produces scales one color at a time and leaves the system thinking to you. Atmos treats the palette as the unit of work: brand colors, complementary accents, neutral grays tinted to match, and semantic colors for success, warning, and danger states, generated together and tuned together.

Try the Atmos color generator

Accessibility that reflects real interfaces

Real UIs rarely put text on pure white. Atmos checks contrast between any two colors in your palette, supports both WCAG 2 ratios and APCA (the perceptual model behind WCAG 3), and includes a vision simulator that previews your palette under different types of color blindness.

Check contrast in Atmos

When is ColorBox the better choice?

ColorBox is free, fast, and great for quickly experimenting with curve shapes, and its export options (including Tailwind and Swift snippets) make it handy for developers who just need one well-shaped scale without creating an account.

When one scale becomes a palette, and a palette becomes something your team maintains, checks for accessibility, and ships to Figma and production, Atmos is built for exactly that.

What are designers saying?

Alex

@MetalHaze

Well, this is awesome!

Hennie

@andyhennie

I was convinced after this read. Their product is actually pretty neat.

SHOWROCK

@shonibareroqeeb

Since I’m not designing today, I have decided to share this simple powerful tool to make uniform color palette with clear accessible checks? Trust me, this will help you in your design system

Matthias Ott

@matthiasott.com

Just bought a lifetime license for Atmos because it is just sooo good for creating perceptually uniform color palettes – including a shade generator, a contrast checker, OKLCH support, CSS export, a Figma plugin, online sharing, and, and… 😍 👉 atmos.style (No affiliation, just genuine excitement! 😁)

Patrick Johansen

@patrickskov

another amazing tool for creating color scales in LCH.

Alberto Calvo

@intemperie.me

My new favorite is atmos.style, which works exactly as I expect, with access to OKLCH color space, P3 color gamut, and visual controls with curves and all the stuff you'd need to create something nice! 💖

Satori Graphics®

@satorigraphic2k

Love your tool and happy to spread awareness 👍🏻

jeremyelder

@jeremyelder

I like working in @atmos_style. Adding all of the variables and quickly selecting a swatch to key off of for contrast is fast.

Abhijeet

@iabhi1610

@atmos_style Best so far

Dusty Pomerleau

@dpom.bsky.social

hue-shifting on atmos is like a drug :)

ColorBox alternative FAQ

Yes. Paste the hex values of your ColorBox scale into Atmos, or simply re-generate the scale from your base color in OKLCH with easing curves, most designers find the Atmos output needs fewer manual corrections.

Yes. Atmos generates shades with configurable easing curves and adds hue transitions, applied in the perceptually uniform OKLCH color space rather than HSB.

Atmos offers a 14-day free trial with access to all features, and you can try limited demos of the tools directly on the atmos.style website. See the Atmos pricing page for plan details.

ColorBox generates individual color scales from hue, saturation, and brightness curves. Atmos generates complete UI palettes in OKLCH, adds contrast checking with WCAG 2 and APCA, a color vision simulator, version history, shared palettes, a Figma plugin, and export to CSS, Tailwind, Style Dictionary, JavaScript, and SVG.

Yes. The Atmos contrast checker works with any foreground and background combination from your palette, using both WCAG 2 and APCA.