# All in One Smart Calculator — Scientific, units & formulas

> Scientific, units & formulas (iPhone/iPad app by TrueNorthLabs Inc..)

- Source: https://appshunter.io/ios/app/all-in-one-smart-calculator/id6762111699 (this page in markdown: same URL + `.md`)
- Developer: [TrueNorthLabs Inc.](https://appshunter.io/developer/1892961267)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 18.0 · 10 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-04-20
- Data updated: 2026-08-31
- User reviews in markdown: https://appshunter.io/ios/app/all-in-one-smart-calculator/id6762111699/reviews.md

## What is All in One Smart Calculator?

A clean, easy-to-use calculator app with all the features you actually need.
From everyday quick math to scientific expressions and unit conversions — everything fits in one app.

■ Calculator Features
• Basic operations, percentage, sign toggle
• Scientific mode: sin, cos, tan, log, ln, √, x², x^y, π, e, parentheses
• Expression mode: enter multi-step formulas on a single line
• Memory functions (M+, M-, MR, MC)
• Auto-detect numbers from the clipboard for quick paste
• Backspace (delete one digit at a time)
• Thousands separators shown automatically as you type (for example, 100000 shows as 100,000), applied to results too

■ Handy Tools
• Tip Calculator — auto-calculate tip and per-person amount from any bill
• Discount Calculator — percentage or fixed amount; see savings and final price
• Split the Bill — exclude separately-paid amounts, then divide by headcount
• Unit Price Comparison — compare price per 100g / 100mL / unit for items A and B
• Unit Converter — 8 categories: length, weight, temperature, speed, area, volume, time, data
• Time Zone Calculator — set one city's time and compare cities worldwide at a glance (50+ cities, automatic DST, works offline)
• Date Calculator — date difference, add or subtract dates, age calculation

■ Formula Library (interactive)
• 71 formulas across 5 fields: geometry, finance and daily life, trigonometry and algebra, physics and engineering, astronomy
• Pick a formula and enter values to calculate instantly — not just a reference chart, but a tool where your input gives an answer
• For geometry, your values appear live on the matching sides, radius, or height of the shape
• See your entered numbers substituted into the formula in real time
• Each formula includes a usage help and an explanation of what it is, its origin, and history (in all 9 languages)
• Handles multiple results (the two roots of a quadratic, a circle's area and circumference, and more), and shows a notice when there is no real solution or a division by zero
• Very large or small values are shown in scientific notation (such as 1.5 x 10^11)

■ History & Favorites
• All calculations saved automatically
• Mark favorites and filter to show only favorites
• Delete entries individually or all at once
• Export results as text

■ Tax & Finance Tools (shown by your country of residence)
Set your country in Settings under Region — separate from your display language — and the matching tools appear automatically.
• Japan — Consumption Tax (net and tax-included both ways, 10%/8%/custom, rounding modes), Simplified Taxation, Invoice Transitional Relief, the 20% Special Rule, and Marketplace Profit
• China / Germany / Spain / France — VAT calculator: convert both ways with each country's standard rates plus a custom rate (CN 13/9/6/3%, DE 19/7%, ES 21/10/4%, FR 20/10/5.5/2.1%)
• Korea — payroll suite: net pay, four major insurances, severance, VAT, compound interest, savings interest, annual leave
• Reference-only note on first open, with a help guide in every tool

■ Personalization
• Light and dark mode toggle
• 7 accent color choices
• Haptic feedback and optional button sounds
• Portrait and landscape, optimized for iPhone and iPad

■ Privacy
• No ads, no tracking, no data collection
• No external network calls
• No permission prompts at launch
• All data (history, memory, settings) stays on your device

■ Languages
• Available in 9 languages: Korean, English, Japanese, Chinese (Simplified and Traditional), German, Spanish, French, Portuguese (Brazil)
• Follows your system language automatically, with manual switching in-app

A clean look and dependable features to make your everyday quick math feel better.


## Version history (last 5 releases)

### 1.13.1 — 2026-08-21

- Added Scan with Photo. Pick a receipt or menu from your photo library and the app finds the numbers and adds them up. Uncheck anything you do not need, fix any misread value, and send the total straight to the bill splitter.
- Everything is recognized on this device. Your photos are never uploaded, and no photo access permission is requested.
- The rating prompt now counts time spent in the tool screens, not just the calculator.

### 1.13.0 — 2026-08-20

New
- Result preview: see the answer before you press =, updating with every key you press.
- Scientific keys in portrait: tap f(x) for sin, cos, square root, pi and the memory keys (MC, MR, M+, M-). No need to rotate your phone anymore.
- Degrees or radians: tap RAD/DEG to switch. sin 30 degrees now works the way you expect.
- Press = again to repeat the last operation, so 2 + 3 = = gives 8.
- C key: while you are typing, AC becomes C, clearing just the current number and keeping the rest of your calculation.
- Haptic feedback can now be turned off in Settings.
- Hardware keyboard support on iPad.

Improved
- The memory badge now shows the stored value. Tap to recall, press and hold to clear.
- History shows dates, and you can press and hold a row to copy just the result.
- The tools menu is grouped by purpose.
- Button labels stay readable with any accent color.

Fixed
- Long results, such as 1/3 or large multiplications, were cut off on screen.
- Pressing the power key (x^y) with no value on screen broke the expression.
- MR did nothing while building an expression.
- With the favorites filter on, Delete All removed hidden records too.

### 1.12.0 — 2026-08-16

English
• A brief brand screen now appears at launch.
• Thousands separators now show in scientific mode too.
• Scientific keypad buttons now respond like the main keypad.
• Fixed the time-zone calculator not updating after the date changed.
• Accessibility: VoiceOver now reads accent colors by name.

### 1.11.3 — 2026-08-10

Improvements and Fixes

• Fixed rounding (round down/up) being applied in reverse when converting tax-inclusive amounts to tax-exclusive.
• Fixed the keypad extending beyond the screen in iPad Split View and Slide Over.
• Improved grading accuracy and answer choices in the formula quiz.
• Fixed errors not displaying correctly in some languages.
• Fixed grouping and decimal separators not matching the regional format in some regions.
• Updated Korean social insurance rates to 2026 figures.
• Various bug fixes and stability improvements.

### 1.10.1 — 2026-07-28

• Fixed accidental digit deletion when swiping across the display. Deleting is now done with the backspace key only.
• Buttons no longer trigger if you slide your finger off before releasing (prevents accidental AC).
• World clock city names are now shown in Chinese (Simplified/Traditional), German, Spanish, French and Portuguese, and can be searched by those names.
• Fixed city names being shown twice in the time zone list.
• Translation cleanup and stability improvements.

## More apps by TrueNorthLabs Inc.

- [PhraseFit: JP & KR Phrasebook](https://appshunter.io/ios/app/phrasefit-jp-and-kr-phrasebook/id6797411693)

All apps by TrueNorthLabs Inc.: https://appshunter.io/developer/1892961267

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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 2026-08-31.*