Color that communicates
Foreground and background choices change legibility on buttons, labels, cards, and long paragraphs.
Free browser-only no signup
Make every word easier to read.
Three simple tools for color contrast, font pairing, and text readability helping you create clearer, more accessible designs.
03focused tools
WCAGcontrast checks
Live Preview
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Built for one job
Readability, without the guesswork.
Each tool focuses on one small decision pick the one that matches your problem, adjust a couple of values, and preview the result instantly.
Color
Open Color Contrast Checker
Color Contrast Checker
Pick any text and background color and see the live contrast ratio, along with WCAG AA and AAA pass / fail badges. Perfect for buttons, labels, and body copy.
→ Instant WCAG 2.2 ratio calculation
→ AA / AAA badges for normal & large text
→ One-click swap of foreground and background
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21:1
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8.6:1
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14:1
Typography
Open Font Pairing Preview
Font Pairing Preview
Preview heading and body font combinations side-by-side before you commit them to a real project. Try serif + sans, sans + serif, or two contrasting weights of the same family.
→ Mix system, Google, and serif families
→ Adjustable heading & body size sliders
→ Visual sample paragraph in every pairing
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Body copy sample pairs cleanly with the serif heading above.
SERIF + SANS
Reading
Open Text Readability Preview
Text Readability Preview
Adjust text size, line height, letter spacing, and reading width, and watch a paragraph re-flow in real time so you can find the comfortable combination before you ship.
→ Live sliders for size, height, spacing
→ Reading-width indicator (45 to 75 characters)
→ Compare before and after side-by-side
45 to 75 chars line-height 1.65
See the difference
Small tweaks change how a page feels.
Poor contrast and tight spacing quietly push readers away. A handful of adjustments stronger ink, calmer line-height, a comfortable measure can transform a page from tiring to effortless.
Compare with the toolsREADABILITY BEFORE / AFTER
Before low clarity
Read with ease
Muted ink and tight spacing make this paragraph harder to scan.
After clearer
Read with ease
Stronger contrast and open spacing help the content breathe.
Examples & inspiration
Useful design, shown visually.
Two quick examples of how color and typography decisions affect real content before you even open a tool.
Type with a purpose
A confident serif heading over a calm sans body instantly reads more considered than a single-font page.
Sample scenario
A clearer reading experience for a small blog.
Imagine a recipe blog with pale text, long lines, and tight spacing. The creator opens all three tools, tests clearer combinations, and updates the design in an afternoon no designer needed.
01Check contrast
02Pair fonts
03Tune spacing
Illustrative scenario only not a real client result or performance claim.
Why ReadableLab
Built for quick, honest checks.
A single-focus toolkit, designed so anyone can verify their design choices in seconds not hours.
Instant feedback
Every value updates the preview immediately.
Simple controls
Only the values that matter no clutter.
Responsive-minded
Previews designed to be readable on any screen.
Free to use
No signup, no install, no tracking inside the tools.
What people say
Kept short, on purpose.
Example: "Contrastlab makes it easy to check color contrast and create more readable designs with simple, helpful tools".
"I keep the contrast checker pinned. It's the fastest way I've found to sanity-check a palette before shipping."
"The font pairing preview saved me from a very expensive mistake. Seeing the two fonts side-by-side did it."
"Readability preview is the tool I recommend to every content editor I work with. Simple and honest."
FAQ
Questions, answered clearly.
Quick answers about the tools, the site, and what ReadableLab does (and doesn't) claim to do.
What does ReadableLab help with?
It focuses on three things: checking color contrast, previewing font pairings, and tuning text presentation for readability.
Do I need to install anything?
No. The tools run in a modern browser. There's no account, extension, or download required for the basic features.
Are the tools a full accessibility audit?
No. Previews are helpful checks, not a complete audit. Always test finished pages with real standards and assistive technologies.
Can I use the examples in my own project?
Yes, as inspiration. Build your own version, and check the license of any third-party font, image, or media you add.
Will the tools work on mobile?
Yes the theme is responsive and each tool page is designed to work on phones, tablets, and desktops.
How often are the guides updated?
Whenever a new post is published on the blog, it appears in the latest-posts section on the homepage.
From the journal
Browse all posts
Small changes. Clearer experiences.
Practical guides, examples, and tutorials for people who ship real content, not just theory.