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Dencho
The tape calculator you can edit — fix a line, it recomputes
A calculator that keeps its working on a tape you can edit. Tap any line — value, operator, or operand — and everything below recomputes. Full-precision Decimal, per-sheet rounding & tax, named sheets with totals. One-time $4.99 / ¥800, no ads, on-device.
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About Dencho on Product Hunt
“The tape calculator you can edit — fix a line, it recomputes”
Dencho was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #124 on the daily leaderboard. A calculator that keeps its working on a tape you can edit. Tap any line — value, operator, or operand — and everything below recomputes. Full-precision Decimal, per-sheet rounding & tax, named sheets with totals. One-time $4.99 / ¥800, no ads, on-device.
Dencho was featured in iOS (110.6k followers), Productivity (656.7k followers) and Accounting (1.8k followers) on Product Hunt. Together, these topics include over 187.3k products, making this a competitive space to launch in.
Who hunted Dencho?
Dencho was hunted by Yuya Tanaka. 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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Yuya Tanaka
Hi PH 👋 I'm the maker.
Dencho started with an annoyance every calculator user knows: you do a long calculation,
one keypress is wrong, and there's no way to fix that one step — so you start over.
Dencho keeps every calculation on a tape, like a paper adding machine. The difference is
that every line is editable: tap the starting value, an operator, or an operand, and every
line below recomputes. Changed lines briefly highlight. Insert, reorder and delete lines
work the same way, and a one-tap Undo rolls the whole action back.
A few things I cared about:
• Full-precision Decimal math — amounts don't drift. Percentages follow business-calculator
rules (1000 + 8% = 1080); add-tax / remove-tax split to the yen.
• Rounding mode, decimal places and tax rate are saved per sheet — reopen an old sheet and
it reproduces exactly.
• Name a tape and it's kept as a sheet, sorted by last edited, each with its total.
• No ads, no tracking; everything stays on device. One-time $4.99 / ¥800, no subscription.
Free gives you the whole tape calculator and up to 2 saved sheets; Pro ($4.99 / ¥800,
one-time) makes sheets unlimited and adds widgets + text sharing.
It's a calculation-notes tool, not statutory bookkeeping — I'm careful about that. Happy to
answer anything, and "can it do X?" requests genuinely shape what I build next.
https://apps.apple.com/app/id6789548710