Building real things, in public
Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.
Bold Text Generator — free online
Make bold, italic or monospace text for posts and bios — free and online, right in your browser, nothing uploaded.
Unit Converter — free online tool
Convert length, weight, temperature and more for free online, right in your browser with nothing uploaded.
Unix Timestamp Converter — free online
Turn a Unix timestamp into a real date in UTC and your local time, free and online, right in your browser with nothing uploaded.
UPC / EAN Check Digit Calculator — free online
Compute or validate the check digit for UPC-A, EAN-13, EAN-8 and ITF-14 barcodes, free and online, right in your browser with nothing uploaded.
URL Encoder / Decoder — free online
Encode or decode URLs and query parts online, right in your browser, with nothing uploaded. Free and quick to use.
Self-Employment Tax Calculator — free online
Estimate your 1099 self-employment tax online for free, right in your browser. See Social Security, Medicare and the deductible half — nothing uploaded.
User-Agent Parser — free online tool
Paste any User-Agent string and read it in plain words: browser, version, engine and device. Free and online, right in your browser, nothing uploaded.
UTM Builder — free online link tagging tool
Build clean, tagged campaign links online for free, right in your browser. Nothing is uploaded, and the encoding is handled for you.
Bulk UTM Builder — free online tool
Build tracked UTM links in bulk online, free and right in your browser. Paste many URLs at once, nothing is uploaded.
UTM Link Decoder — free online tool
Paste a link with UTM tags and read every tracking value in a clean table, free and online, right in your browser with nothing uploaded.
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