Building real things, in public
Notes from DEMHA FUTURE — how we build apps fast with AI, and what we learn.
A/B Test Sample Size Calculator — free online
Work out how many visitors your A/B test needs to trust the result. Free and online, right in your browser, nothing uploaded.
A/B Test Significance Calculator — free online
Free A/B test significance calculator. Enter visitors and conversions and get the p-value and a clear verdict right in your browser, nothing uploaded.
Acceptable Use Policy Generator — free online
Make a clear Acceptable Use Policy for your app or community, free and online, right in your browser with nothing uploaded.
Accessibility Statement Generator — free online
Write an accessibility statement for your website in minutes, free and online, right in your browser with nothing uploaded.
Accessible Palette Builder — free online
Pick colors and instantly see which text and background pairs pass WCAG contrast. Free, online, right in your browser, nothing uploaded.
Ad Budget Calculator — free online
Work out the ad budget you need to hit a sales goal, free and online, right in your browser with nothing uploaded.
Ad Budget Pacing Calculator — free online
Check if your ad campaign is on pace, overspending, or underspending. Free online, right in your browser, with nothing uploaded.
Ad Character Limit Checker — free online
Check your ad headline and description against Google, Meta, LinkedIn, X and TikTok limits — free, online, right in your browser, nothing uploaded.
Emoji & AI Tell Cleaner — free online tool
Strip emojis and AI tells from ad copy free online, right in your browser. Get clean text ready to paste into Google Ads, Meta or LinkedIn. Nothing uploaded.
Ad Frequency & Reach Calculator — free online
Work out average frequency and reach from your impressions and unique audience. Free, online, right in your browser, nothing uploaded.
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