Word and character counter
Count words, visible characters, UTF-8 bytes, paragraphs and estimated reading time. Paste your writing without uploading it.
Useful tools.
Right on your website.
Give readers something they can use. Add a working calculator or a small creative tool to a guide, resource page or client website in minutes.
Free · No account or API key · Inputs stay in the visitor’s browserMAKE YOUR PAGE MORE USEFUL
Choose a tool. Try it. Make it yours.
The preview is a working embed. Your visitors get the same tool, with their own empty inputs.
A SMALL LIBRARY WITH PLENTY OF USES
15 tools, ready to drop in.
Add a margin calculator to a pricing guide, a word counter to a writing resource, or a contrast checker to a design tutorial.
Colour contrast checker
Calculate the ratio between two HEX colours. Check WCAG AA and AAA text thresholds and preview the combination.
Percentage calculator
Find a percentage of a number, a part as a percentage, or the whole from a part. See the calculation step by step.
Percentage change calculator
Calculate percentage increase or decrease between an original and new value, alongside the absolute change.
Percentage difference calculator
Compare two nonnegative values without treating either one as the original. Calculate their absolute percentage difference.
Profit margin calculator
Calculate gross profit and gross margin from selling price and product cost. Compare margin with markup.
Markup calculator
Calculate markup and gross profit from cost and selling price. Understand why markup differs from margin.
Discount calculator
Find the final price and amount saved after a percentage discount. Calculate a sale price instantly.
Break-even calculator
Calculate the whole units and sales needed to cover fixed costs using price and variable cost per unit.
CPC calculator
Calculate average cost per click from advertising spend and reported clicks, using one currency and reporting period.
CPA calculator
Calculate cost per action from campaign spend and conversions. Use your own consistent definition of an action.
Customer acquisition cost calculator
Calculate average CAC from acquisition spending and new customers. Include the costs your business uses consistently.
Customer lifetime value calculator
Estimate revenue and gross-profit customer lifetime value from average order value, purchase frequency, lifespan and gross margin.
Growth rate calculator
Calculate compound growth per period from a positive starting value, ending value and number of periods.
Campaign ROI calculator
Calculate simple campaign return on investment from attributable return and total campaign cost. See net return and ROI.
FROM PREVIEW TO PUBLISHEDOne useful addition.
One useful addition.
Three small steps.
- Choose and try your tool. Use the live preview and check the phone width. The full tool page explains its formula, assumptions and limitations.
- Copy the embed code. Paste it into your page’s custom HTML or embed block. Automatic height uses a small script; choose iframe-only code if your editor removes scripts.
- Publish and check your page. Test a result on desktop and phone. Your site’s settings need to allow frames from visitortrack.ing, and the optional helper if you use automatic height.
The code opens a fresh tool for every reader. Values entered in this preview are not saved or shared.
A FEW PRACTICAL DETAILS
Before you add one.
Is this a custom calculator builder?
These are ready-made tools with published methods. Choose from the library and use the working embed. Custom formulas, lead forms and white-label branding are not part of this library.
Can I use these on a client or commercial website?
Yes. You can embed the tools on a personal, commercial or client website. No Visitor Tracking account or API key is needed. Each embed includes a small link to its full tool and explanation.
Does the embed track my visitors or send their inputs?
The embedded tools do not send analytics events, input text or calculation values to us. Your browser still requests the files needed to display the tool from our service. The optional height helper exchanges readiness and frame-size messages only. To measure visits to your own page, install your website’s separate analytics tag.
What if my website editor strips out scripts?
Turn off “Fit height automatically” to get iframe-only code, then choose a suitable frame height. If the editor also blocks iframes, link to the full tool instead. Check the published page because editor previews can behave differently.
Can I embed more than one tool?
Yes. Each tool keeps its own inputs and adjusts its own frame. The automatic-height helper only needs to be included once on the page, even when you add several tools.
What happens if the helper is blocked?
The frame keeps its starting height, and readers can scroll within it. The tool itself still needs JavaScript and an internet connection to load. These are hosted tools, so they depend on this service being available.
A CLEARER PICTURE STARTS HERE
Give your resource a home. See who finds it.
Add a useful tool to your page, then measure the visits with simple cookieless analytics. Website tracking is free during beta.
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