# Summa – Calculator with Notes — Math, Percent & Sales Tax

> Math, Percent & Sales Tax (iPhone/iPad app by Oliver Dietmar Harald Sievers.)

- Source: https://appshunter.io/ios/app/summa-calculator-with-notes/id6796963557 (this page in markdown: same URL + `.md`)
- Developer: [Oliver Dietmar Harald Sievers](https://appshunter.io/developer/6796963559)
- Category: Productivity, Finance
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 26.0 · 6 MB
- Languages: American English, French (France), German (Germany), Italian, European Spanish
- Released: 2026-09-04
- Data updated: 2026-10-25

## What is Summa?

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; date fields with a calendar
• Finance functions – compound interest, savings plan, loan payment, remaining balance, loan interest, savings goal, purchasing power
• Break-even points – the year from which two cost curves cross, the point at which a threshold is reached
• Case distinctions – a different result depending on a value
• 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. Ten 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.

Terms of Use: https://osiev.de/en/summa/eula.html

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Summa AI | $1.99 | per month |
| Summa AI | $12.99 | per year |

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Summa Pro | $8.99 | one-time |


## Is Summa safe?

Not enough ratings yet to assess Summa.

## Is Summa legit?

Summa – Calculator with Notes has limited verification signals. The AppsHunter Legitimacy Score for Summa is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.3.2 — 2026-10-23

Dates can now be written with month names, such as "March 15, 2026", "15 March 2026" or "March 2026", and in the 2026-03-15 format.

Comparing two values shows Yes or No right away, for example whether a difference is below zero, and the result works inside if(…).

The welcome note, templates and tutorials are now also available in Spanish, French and Italian.

### 1.3.1 — 2026-10-14

If-then lines now also calculate when they check whether two values are equal or different, for example whether you're a member or not. Until now, such a line stayed empty.

Summa also suggests matching functions and your own values as you type.

### 1.3 — 2026-09-29

New: Summa AI. You ask something, and Summa AI writes the calculation for it, with every assumption and sliders to adjust. Ask again and it explains what drives the result, or changes individual lines. Summa AI is a separate subscription and requires iOS 27 or macOS 27 with Apple Intelligence.

As you type, Summa suggests functions and your variables and fills in a function's arguments. Unknown names are created with one tap.

For loans there are interest cost and remaining balance, with the term in months or years. Summa also finds the point from which two cost curves cross.

### 1.2.1 — 2026-09-17

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.

### 1.2 — 2026-09-11

A guided tutorial walks through the app step by step inside a real note, with its own lessons for the Pro features. It opens automatically after setup and can be explored freely at any time.

The calculation syntax understands variables inside an expression and continuation lines that build on the result of the line above.

Fixes: several smaller issues in charts, table entry, the tutorial and syncing have been resolved.

## Apps similar to Summa

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [City Agenda – Dr. Timur Labs](https://appshunter.io/ios/app/city-agenda-dr-timur-labs/id6818844237) | — | Free | Productivity |
| [Aside: Chat Notes](https://appshunter.io/ios/app/aside-chat-notes/id6803959120) | — | Free | Productivity |
| [CloudShots: Screenshot History](https://appshunter.io/ios/app/cloudshots-screenshot-history/id6776119510) | — | Free | Productivity |
| [Life AI: Organize Your Life](https://appshunter.io/ios/app/life-ai-organize-your-life/id6798402570) | 5.0 (8) | Free | Productivity |
| [My New Shopping List](https://appshunter.io/ios/app/my-new-shopping-list/id6738043103) | — | Free | Productivity |
| [FocusBFF: Activity Scheduler](https://appshunter.io/ios/app/focusbff-activity-scheduler/id6755091742) | 5.0 (3) | Free | Productivity |

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-25.*