Building real things, in public
Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.
UTM Naming Convention Builder — free online
Set your UTM rules once, then check any campaign link follows them. Free and online, right in your browser, nothing uploaded.
UUID Decoder — free online tool
Paste a UUID to see its version and variant, right in your browser. For v1 and v7 it reads the time and node too. Free and online, nothing uploaded.
UUID Generator — free online tool
Make v4 UUIDs in bulk, free and online, right in your browser. Nothing is uploaded, and you can copy them all in one click.
Value vs Effort Matrix — free online
Sort your tasks by value and effort to spot quick wins. Free and online, right in your browser, nothing uploaded.
VAT Calculator — free online tool
Add, remove or reverse VAT at any rate, free and online — right in your browser, with nothing uploaded or saved.
VAT Margin Scheme Calculator — free online
Work out VAT on the margin for second-hand goods, free and online — right in your browser, with nothing uploaded.
vCard to CSV Converter — free online
Turn a .vcf contact file into a CSV spreadsheet, or a CSV back into .vcf — free and online, right in your browser with nothing uploaded.
vCard (.vcf) Maker — free online tool
Make a proper .vcf contact card free and online — fill in the details, download or copy it, right in your browser with nothing uploaded.
vCard QR Code Generator — free online
Turn your contact details into a scannable vCard QR code, free and online, right in your browser with nothing uploaded.
vCard Tools — free online .vcf editor
Merge, split, or convert .vcf contact files to and from CSV online, free, right in your browser. Nothing is uploaded.
Get new posts
Soon you'll be able to drop your email and get new posts — no account, no spam.
Email sign-up isn't live yet — nothing is collected for now.