Calculate
as you type.
Sums, percentages and brackets, worked out line by line. Change a number and every answer updates.
Type math the way you think it.
Sumi is a notepad that calculates. Write sums, units, money, dates and time zones in plain words, and every answer appears as you type.
Write it down, see the answer
Each line is worked out as you type. The result sits on the right, ready to copy with a tap.
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What is Sumi?
- 01
A notepad that calculates
No buttons, no brackets to balance. Write the problem the way you would say it, one line at a time.
- 02
Answers as you type
Every line updates instantly, and changing a number further up updates everything that uses it.
- 03
Units, money, dates, zones
Lengths, weights, temperatures, currencies, dates and time zones all work on the same page.
- 04
Private by design
No account and no tracking. Your notes stay on your iPhone and are saved automatically.
Everything on one page
Sumi understands the things you actually calculate, written the way you would write them on paper.
Convert
units and money.
Lengths, weights, temperatures and currencies. Mix currencies in one sum.
Count
down to any date.
Days until christmas, weeks since new year, or 3pm Paris in New York.
Name
it, reuse it.
Give a line a name, use it anywhere below, and total a section with "sum".
Keep
it private.
No account and no tracking. Your notes stay on your iPhone.
Frequently asked questions
What can I type?
Plain arithmetic and percentages, unit and currency conversions ("10 km to mi", "$50 in €"), dates ("days until christmas", "today + 18 days"), times and time zones ("3pm in Tokyo"), and named values you can reuse on later lines.
Where do exchange rates come from?
Sumi downloads the day's reference exchange rates at most once a day. Everything else works without a connection.
Does Sumi collect my data?
No. There is no account, no analytics and no tracking. What you write is stored only on your iPhone.
Is it on iPad or Mac?
Sumi launches on iPhone first. iPad and Mac may follow.
How much does it cost?
Pricing will be announced at launch.