Building real things, in public
Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.
Regex Cheat Sheet — free online patterns
A free online library of ready-to-use regex patterns for email, URL, IP and more. Search, test and copy them right in your browser, nothing uploaded.
Regex Tester — free online tool
Test a regular expression online and see matches highlighted as you type, free and right in your browser with nothing uploaded.
Remittance Advice Generator — free online
Make a remittance advice PDF online for free and tell a supplier which invoices a payment covers, right in your browser with nothing uploaded.
Remove Duplicate Lines — free online tool
Paste a list and delete repeated lines, then sort it — free and online, right in your browser with nothing uploaded.
Remove Empty Lines from Text — free online
Strip blank lines from any text or CSV for free, right in your browser. Nothing is uploaded, and you can clear space-only lines too.
Remove Line Breaks — free online tool
Strip line breaks and clean up messy spacing in any text, free and online, right in your browser with nothing uploaded.
Rent Receipt Generator — free online
Make a signed PDF rent receipt for your tenant online, free and right in your browser. Nothing is uploaded.
Reorder Point Calculator — free online
Work out your safety stock and reorder point in seconds, free and online, right in your browser with nothing uploaded.
Resignation Letter Generator — free online
Make a polished resignation letter with your notice period and last day worked out for you, free and online, right in your browser with nothing uploaded.
Customer Retention Rate Calculator — free online
Work out your retention, churn and repeat-customer rates online for free, right in your browser. Enter a few numbers and read the results — nothing uploaded.
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