Dencho
ACTIVEThe tape calculator you can edit — fix a line, it recomputes
Launched July 22, 2026
About Dencho
Dencho is a tape‑style calculator for iPhone and iPad that lets you edit any line on a calculation tape and automatically recomputes all subsequent lines. You can save each tape as a named sheet, keep per‑sheet rounding modes, decimal places and tax rates, add note‑only lines, and view a running total bar. The app includes unlimited undo/redo, three text sizes, light/dark mode, and offers a one‑time Pro upgrade for unlimited sheets, widgets and sheet sharing, all without ads or data collection.
Pricing
Pricing information isn't available yet.
Capabilities
Editable tape calculator
Tap any line—starting value, operator, or operand—to edit it; all lines below recompute instantly, with changed lines highlighted.
Save named sheets
Save each tape as a sheet, sorted by last edited, showing its total and line count; sheets persist on device.
Note‑only lines
Insert lines that don’t affect calculations but appear in sharing and search.
Per‑sheet settings
Set rounding mode, decimal places (0‑4) and tax rate per sheet; settings are saved and reapplied when the sheet is reopened.
Undo/Redo
One‑tap undo rolls back the last action; redo restores it, covering edits, inserts, reorders, and deletions.
Unlimited sheets (Pro)
One‑time ¥800 (US$4.99) purchase unlocks unlimited sheets, widgets, and sheet sharing via text export.
Dark/Light mode & text size
Choose between three text sizes and light or dark appearance.
No ads or tracking
All calculations stay on‑device; the app makes no network calls except for Apple StoreKit purchases.
Use Cases
Freelance invoicing
Quickly calculate project costs, apply tax rates, and adjust line items on the fly.
For: Freelancers and independent contractors
Small business expense tracking
Maintain a ledger of purchases, edit entries, and see updated totals instantly.
For: Small business owners
Personal budgeting
Create sheets for monthly budgets, edit expenses, and observe the impact on remaining funds.
For: Individuals managing personal finances
Student grade calculations
Enter grades, adjust scores, and instantly see updated averages without restarting calculations.
For: Students and educators
Quick business‑style calculations
Perform percentage‑based price, tax, and discount calculations using business‑calculator conventions.
For: Retail and service professionals