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Type math in plain English on iPhone. Write a line, results appear live in a second column. Edit anything, everything updates. Currencies, unit conversions, variables, aggregates, dates, math functions, hex. All inline, all editable. Free with three sheets. Pro unlocks unlimited sheets, iCloud sync, and export to PDF, Markdown, or plain text.
Most calculators make you commit before you can think. Tap a number, tap an operator, the previous value is gone. Real math is messier: a rough trip budget, a freelance invoice, a recipe scaled up. You want to see the whole thing, edit a line, and watch the rest update.
My workaround was a notes app. Write "flight 420, hotel 3 nights at 180 each", do the arithmetic in my head. Context preserved, but not actually calculation.
Sigma is the scratchpad I wanted. Type math in plain language, results appear live on the right. "20% tip on 84.50", "rent + utilities", "120 EUR in USD". Variables, currencies, unit conversions, dates, all inline. Everything stays editable.
A few things I left out of the description: built-in themes, a calculation reference you can pull up while typing, and full French localisation. iPhone-only on purpose for v1, the design and parser are tuned for one-handed thumb typing.
Free to start with three sheets. Pro is $1.99/mo, $14.99/yr with a 7-day free trial, or $29.99 lifetime, and unlocks unlimited sheets, iCloud sync, and export to PDF, Markdown, or plain text.
I'm the solo dev. Ask me anything: parser choices, why iPhone-only or what's next on the roadmap.
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About Sigma Notepad Calculator on Product Hunt
“The notepad calculator iPhone never had.”
Sigma Notepad Calculator was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #158 on the daily leaderboard. Type math in plain English on iPhone. Write a line, results appear live in a second column. Edit anything, everything updates. Currencies, unit conversions, variables, aggregates, dates, math functions, hex. All inline, all editable. Free with three sheets. Pro unlocks unlimited sheets, iCloud sync, and export to PDF, Markdown, or plain text.
Sigma Notepad Calculator was featured in iOS (110.4k followers), Productivity (653.8k followers) and Notes (8.3k followers) on Product Hunt. Together, these topics include over 180.3k products, making this a competitive space to launch in.
Who hunted Sigma Notepad Calculator?
Sigma Notepad Calculator was hunted by Souleymane Sidibé. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
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Souleymane Sidibé