Building real things, in public
Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.
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.
Retirement Calculator — free online tool
See what your savings could grow to by retirement. Free and online, right in your browser, with nothing uploaded.
ROE Calculator — free online tool
Work out return on equity from net income and shareholders' equity. Free and online, right in your browser, with nothing uploaded.
Reverse Sales Tax Calculator — free online
Pull the sales tax out of a tax-included total and see the pre-tax price, free and online, right in your browser with nothing uploaded.
Review Schema Generator — free online
Make valid Review and AggregateRating schema for star snippets, free and online, right in your browser with nothing uploaded.
Reviews-Needed Calculator — free online
See how many 5-star reviews you need to reach your goal rating. Free and online, right in your browser, nothing uploaded.
AI Text Rewriter — rewrite text online
An AI tool that rewrites, summarizes, paraphrases or fixes any text in the same language, online in your browser.
RICE Score Calculator — free online
Rank your backlog by RICE for free, right in your browser. Score reach, impact, confidence, and effort. Nothing is uploaded.
Pinterest Rich Pin Markup Generator — free online
Make the Open Graph tags Pinterest needs for Rich Pins, free and online — built right in your browser, nothing uploaded.
Ring Size Converter — free online tool
Convert ring sizes between US, UK, EU and mm for free online, right in your browser. Nothing is uploaded, just type a size and see every match.
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.