22 free tools that run in your browser
Break-even ad forecasts, translation-key audits, bulk certificates, AI carbon estimates and more. Specialist calculators and file tools that process everything on your device.
Sample outputs from the live tools
Each one shows its working. Formulas, assumptions and limits are on the page, not hidden behind a result.
Most dropshipping calculators tell you if a campaign is profitable today. This one forecasts the month it stops being profitable: break-even CPC, break-even ROAS, a 12-month compounding CPC forecast and a profit heatmap.
Turn a price tag into work hours, future wealth lost to compounding, a 0–100 financial stress score and your job-loss runway, for cash or EMI.
Drop in locale JSON files and see every missing, empty or wrong-type key across languages. Checks ICU plurals, fills gaps, and exports patches that never overwrite existing translations.
Upload a blank certificate, drag fields into place, add a drawn or typed signature, import a CSV, Excel or JSON roster and export up to 100 personalised certificates as one PDF or a ZIP. Nothing is uploaded.
Estimate the gCO₂ of a prompt from token count, model energy profile and your country's grid, then compare grid against cloud scenarios.
Count tokens for OpenAI and Anthropic models before you send a prompt, with a dedicated page for each provider.
Compare two CSV files to see exactly what changed, or edit a large file in a virtualised grid with undo and redo.
Standard SI factors at full floating-point precision. Try a quick conversion here, then open the full converter for every unit.
Made and maintained by an independent developer. Read who is behind it.
Every calculator explains its method: what goes in, which formula runs and what the result means, so you can sanity-check a number instead of taking it on faith.
The carbon, purchase and ad-decay tools are models. Each lists its assumptions and limits, and none replaces professional financial, medical or engineering advice.
Files, text and figures are processed locally in your browser. We use anonymised page-level analytics; what you type into a tool is never sent to our servers.
It is free to use and there is no sign-up. The site may show ads to cover hosting costs; they never see what you enter into a tool.
No. Tools run in your browser, so files, pasted text and figures stay on your device. We collect anonymised usage data such as page visits through Vercel Analytics. See the Privacy Policy for details.
Unit conversions use standard SI factors at full floating-point precision. The carbon, purchase and ad-decay tools are estimates built on stated assumptions, so use them for planning rather than compliance or advice.
OpenAI and Anthropic, with a dedicated page for each. Tokenisation differs between providers, so the same prompt can cost different amounts.
Yes. Import a CSV, Excel or JSON file with up to 100 rows. The template, the data and the finished certificates are processed on your device and never uploaded.
Yes, every tool is responsive. Precise layout work, such as placing certificate fields, is easier on a larger screen.
Yes. Pick one of eight themes in the hero. Your choice is remembered in your browser for a few days.
Use the Contact page. Requests for tools people struggle to find are the ones we want most.
Open a tool and get your answer. Your files and figures never leave your device.
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