# Calculator C: Auto-Sum History — See the formula, get the total

> Calculator with history, customizable buttons, and formula display. (iPhone/iPad app by DIGITALNAUTS INC..)

- Source: https://appshunter.io/ios/app/calculator-c-auto-sum-history/id1174687792 (this page in markdown: same URL + `.md`)
- Developer: [DIGITALNAUTS INC.](https://appshunter.io/developer/1083829093)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 4.42/5 from 43 App Store ratings · 34 written reviews indexed
- Age rating: 4+
- Requires: iOS 17 · 23 MB
- Languages: Australian English, Arabic, Catalan, Croatian, Czech, Danish, Dutch, Finnish, Canadian French, German (Germany) and 23 more
- Released: 2016-11-24
- Data updated: 2026-10-20
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/calculator-c-auto-sum-history/id1174687792/reviews.md

## What is Calculator C?

Every formula and result stays on screen — a calculator that shows its work.
Totals, tax, and statistics (max, min, average) are all calculated for you.
Move the buttons up, down, left, or right for comfortable one-handed use.

# Main Features
- Formula & history display — see every step, including brackets and square roots
- Auto totals & subtotals — add up the numbers in your history
- Statistics — max, min, average, and count, calculated for you
- Automatic tax — switch between tax-included and tax-excluded in one tap
- Export — Text, CSV, Excel, Markdown, JSON, or PDF
- Themes — change colours and button shapes
- Adjustable button layout — shift keys up, down, left, or right

# Great For
- Reusing a previous result with a tap on the history
- Copying results and history into notes or messages
- Checking totals and tax-inclusive prices while shopping

## Key features

- Adjustable button positions
- Formula and history display
- Automatic calculation aggregation
- Share calculation results
- Clipboard copy
- Reuse history entries

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove ads | $3.99 | one-time |


## Is Calculator C safe?

Calculator C: Auto-Sum History appears mostly safe based on user ratings. The AppsHunter Safety Score for Calculator C is 83 out of 100. This assessment is based on 43 user ratings, with an App Store average of 4.4 out of 5. Of 43 App Store ratings, 86.0% point to a safe experience, 4.7% suggest some concerns, and 9.3% point to a risky experience.

## Is Calculator C legit?

Calculator C: Auto-Sum History appears to be a legitimate app. The AppsHunter Legitimacy Score for Calculator C is 90 out of 100 points across 7 verification signals from App Store and developer data.

## Recent user reviews (10 of 34)

All indexed reviews: https://appshunter.io/ios/app/calculator-c-auto-sum-history/id1174687792/reviews.md

### 5/5 — Máy tính

*2024-09-30, version 1.1.9*

Rất okay máy lưu được các phép tính

### 5/5 — Nhận xét, đề nghị:

*2023-11-15, version 1.1.2*

Phong chữ của phần lịch sử, còn nhỏ, nên gia tăng, có thể gấp đôi.

### 5/5 — Ok

*2023-11-07, version 1.1.1*

Ok

### 5/5 — 記憶模式讚讚讚

*2023-10-15, version 1.1.0*

非常好用而且平價的APP

### 5/5 — 非常好用！讚讚讚！

*2023-07-12, version 1.1.0*

非常好用！讚讚讚！

### 5/5 — hhh

*2022-11-23, version 1.0.26*

tuyệt vời

### 1/5 — Quảng cáo vớ vẩn

*2022-01-16, version 1.0.25*

Quảng cáo vớ vẩn

### 4/5 — 結構使いやすい

*2021-11-06, version 1.0.25*

気に入って使ってます。
ただ、色を変えれるともっとみやすいのに惜しいです。
ぜひボタンキー列と設定キー列は別の色にしてもらえるとみやすいです。
（計算の記録残りの部分は今のままでいいのですが）

よろしくお願い申し上げます。

### 5/5 — Love

*2021-06-01, version 1.0.25*

Excellent

### 5/5 — ดี

*2021-03-13, version 1.0.24*

ดี

## Frequently asked questions about Calculator C

### What does Calculator C Formula History do?

This app is a versatile calculator that provides a history of your calculations, displays formulas as you input them, and allows for automatic aggregation of results. It also features customizable button positions for easier one-handed operation.

### What are the key features of this calculator app?

Key features include adjustable button positions for one-handed use, the ability to view formulas and calculation history, automatic aggregation of results, sharing of calculations, clipboard copying, and the option to reuse numbers from history.

### Is Calculator C Formula History free to use?

The app is free to download and use, but it does offer in-app purchases and may display advertisements. Specific features or an ad-free experience might be available through these in-app purchase options.

### How can I reuse previous calculations?

You can easily reuse previous calculations by tapping on an entry in the history. This will bring the numbers and operations from that past calculation back into the current input, saving you time and effort.

### Can I adjust the button layout?

Yes, the app allows you to adjust the numeric button positions. You can move them up, down, left, or right to suit your preference for one-handed operation, making it more comfortable to use while shopping or on the go.

## Version history (last 5 releases)

### 2.0.10 — 2026-10-04

- Added support for iOS 27.
- Improved internal processing.

### 2.0.9 — 2026-09-07

- Updated internal libraries.
- Changed the app name.

### 2.0.8 — 2026-08-31

- Fine-tuned some features.
- Updated internal libraries.

### 2.0.7 — 2026-07-30

- You can now choose a theme.
- Updated internal libraries.

### 2.0.6 — 2026-07-26

- You can now save up to three tax rates.
- Updated internal libraries.

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## More apps by DIGITALNAUTS INC.

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All apps by DIGITALNAUTS INC.: https://appshunter.io/developer/1083829093

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*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 2026-10-20.*