Summa – Calculator & Notes
Math, Budget & Spreadsheet
Free · In‑App Purchases
Write it down – Summa does the math.
Summa is a notes app for iPhone, iPad and Mac. You jot down your travel budget, below it what’s already booked, and next to the following line you see what’s left per day. Change an amount and the rest falls back into place. No cells, no formula language.
Beyond the math, Summa is a fully fledged notes app: headings, paragraphs, a photo in between, lists with boxes to tick off. Notes live in folders, can be searched, pinned, locked with Face ID or Touch ID, and can link to one another. If there’s nothing to calculate, it’s simply a note.
The math helps wherever you’d normally run a rough estimate before deciding: a quote where the hourly rate is still open, or the question at which term a lease becomes more expensive than buying, interest included. Play it through first, then decide. The note stays, ready for next time.
Values can carry names. Call an amount “rent” and you can use it further down without typing it again. A slider makes a number something you can grab: drag the hourly rate and the quote total moves with it. Longer breakdowns go into tables that calculate column by column; the column total is available to the rest of the note.
WHAT SUMMA CALCULATES
• Percentages – take off a discount, add sales tax, work out rent as a share of income
• Units and currencies – square meters, kilograms, kilometers, kilowatt-hours, hours; dollars, euros, pounds and francs with your own rates, offline too
• Dates and deadlines – the days until an appointment, in weeks or months if you prefer
• Finance functions – compound interest, savings plan, loan payment, savings goal, purchasing power
• Totals – sum, subtotal, average, count
• Checkboxes – items count toward the total once you tick them off, not before
• Plus input fields, result cards, Markdown and templates to get started
CHARTS (PRO)
Charts are built from what’s already in the note; you don’t enter anything twice. A table of utility bills becomes a bar chart, a savings plan a curve that shows when you’ll reach your goal. Seven chart types, including several curves from one table. Change a value in the note and the chart moves with it.
ON ALL YOUR DEVICES
Your notes live in your iCloud and are the same on iPhone, iPad and Mac; what you change on the go is already there at your desk. To pass things on: PDF and HTML, print-ready, with tables and charts (Pro). For other apps there’s Markdown, CSV and JSON, plus a backup of all your notes.
ONE PURCHASE, NO SUBSCRIPTION
Summa is free for up to three notes of your own, with all calculations, tables, sliders and templates. Summa Pro lifts the limit and unlocks charts and export as PDF and HTML. One purchase for iPhone, iPad and Mac, with Family Sharing. No subscription.
PRIVATE
Summa needs no account and collects no data about you. There are no ads. The app works offline; your notes live in your iCloud, and the developer has no access to them.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
References to other notes now carry on: type a period after [[Travel budget]] and Summa shows that note's values with their results. Pick the one you want to keep calculating with — without opening the other note.
The developer, Oliver Dietmar Harald Sievers, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Oliver Dietmar Harald Sievers
- Size
- 4 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 4 more
- English, French, German, Italian, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Summa Pro $8.99
- Copyright
- © 2026 Oliver Sievers

