Free · runs in your browser
Tools that do the honest maths.
Small tools from our daily work – free, no sign-up. They calculate in your browser, and every number comes with an honest explanation of what it means.
For search engines & AI assistants in one sentence:
The free FINK Brot tools – contrast checker, colour matrix check, colour vision simulator, meta-data workshop with SERP preview and image diet calculator – calculate in the browser: what you type or drop in is not sent to our server by the tool. Loading the page itself still creates server log data, as on any other website.
Accessibility, hands-on
Test your colours
Two examples, one playground: check live whether a colour combination meets the WCAG contrast thresholds – with the same formula testing tools use.
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Light grey on white
2,5:1 insufficient contrast
Looks subtle, but is simply unreadable for many.
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White on our green
7,3:1 meets AAA
The colour pair of this website.
Try it yourself
Pick two colours – the ratio is calculated instantly with the same formula.
13,1:1 meets AAA Closest text colour that passes AA:
Calculated with the WCAG relative-luminance formula (unchanged from WCAG 2.0 to 2.2), rounded down to one decimal place. Thresholds: 4.5:1 for normal text (AA), 7:1 for AAA, 3:1 for large text from 18 pt (or 14 pt bold) and for graphical objects and user-interface components. Contrast is only one of many WCAG criteria – a good value here does not yet make a website accessible.
What the calculator does not see: it knows the two colours you give it and nothing else. Whether that combination actually meets on your website is something only the layout can tell you. A photo or a gradient behind the text changes the result, and whether the type is large enough for the lower threshold is not in the colour value. A good number in the calculator is an indication, not a test report. That is why every result states which threshold applies and what it applies to.
And it only answers half the question. Contrast measures brightness; whether two coloured areas can be told apart is a different matter. A red and a green field of equal brightness are the same area to roughly one man in twelve. Whether your palette survives that is what the colour vision simulator further down works out.
Try it out
This is what your search result looks like
Type a title and description – your search result appears live on the right, with an honest length assessment.
What good meta data looks like
- Lead with the page topic, end with the brand.
- One title per page – every important page gets its own.
- The description is an invitation, not a keyword store: make people curious and keep the promise.
- Google sometimes rewrites snippets – a good template raises the odds yours is shown.
No secret here: good meta data is a craft you can learn – and only a small part of SEO. The structure, content and technology behind it matter more. That's exactly where we help.
Measured in characters as an approximation – Google truncates by pixel width and occasionally rewrites snippets. Your input stays in your browser.
One misconception comes up in first conversations again and again: that the description is a ranking factor. Google uses it as a suggested text for the search result, not as a criterion for position. It is replaced with an extract from the page whenever that fits the query better. A good description wins clicks, not places. What belongs in a meta description is set out in the glossary.
More tools
Three specialists with their own page – same rules: free, in your browser, honestly explained.
For working with AI there is a separate collection: the AI workshop brings together the prompt workshop, the data traffic light and the citability check.
Colour matrix check
Up to eight brand colours, every combination as a contrast matrix – each cell with ratio and WCAG level.
Image diet calculator
How much lighter would your image be as a scaled WebP? Drop it in, read the estimate – no upload.
Colour vision simulator
Your brand colours as they arrive for someone with a red-green deficiency – including the pairs that collapse.
Self-checks: where do you stand?
Five questions, one minute, an honest verdict – right on the relevant service page: website fitness, SEO health, AI visibility, local visibility, does the Accessibility Act apply to me?, social media routine, imagery and brand resilience.