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Jisuan — Calculate right where you type.

Calculate instantly on Chrome webpages, quickly reuse templates and constants, and manage income and expenses with Private Ledger.

Download for macOS Tutorial

Notarized by Apple
On-device
Private

A. Free core calculationsAlways-free essentials

Free

#ScenarioTest inputWrite-back value

F01Addition and grouping=12580+369016,270

F03Multiplication=100*909,000

F06Thousands in calculations=36*1000+850044,500

F10Date across months2026-09-15 + 45d2026-10-30

B. Pro finance calculationsProfessional finance expressions

Pro

#ScenarioTest inputWrite-back value

P01Calculate net from gross108000 incl. 8% tax100,000.00

P04Add tax to net100000 net + 8%108,000.00

P06Year-over-year growthThis year 1.26m / last 1.05m20.00%

P07Completion rateTarget 1.2m, completed 930k77.50%

Jisuan panel with number formats, a saved 5% tax rate, and tax-inclusive and tax-exclusive conversion buttons

1 / 2

1Type an expression in a web field
2Press ⌘⌥=
3Choose a result and write it back

Core features

Calculate, reuse,then record.

Calculate on the webpage, reduce repeat typing with templates and constants, and add results you want to keep to your Private Ledger.

Chrome insertion supports identifiable standard text fields only.Confirm webpage insertion and ledger entries separately.

Calculate in Chrome

Press ⌘⌥= in a Chrome field, edit the expression in the panel, then check and insert the result.

Actual Jisuan calculation panel with expression editor and results

If the webpage blocks operators, keep calculating in the panel.

See Chrome instructions

Templates + constants

Save recurring formulas as templates and frequently used values as constants. Enter only the parameters that change.

Actual Jisuan template parameter screen with inputs and result preview

Templates store formulas; constants store reusable values.

Explore templates and constants

Add results to your ledger

Select a result and choose Add to ledger. Confirm income or expense and its category, then save it encrypted on your Mac.

Actual Jisuan Private Ledger window showing ledger protection and backup features

Your ledger is encrypted on this Mac, separate from calculation history.

Explore Private Ledger

US example · USD. Tax rates are illustrative, not applicable-rate advice. Sample settings apply only in the test window; account preferences stay unchanged.

Runs locally

Expressions stay on your Mac

Decimal precision

Suitable for financial numbers

Confirm before writing

Write back only after selection