# Sumbox - Calculator & Tools — No Ads · 30+ Tools · Themes

> No Ads · 30+ Tools · Themes (iPhone/iPad app by 群利 凌.)

- Source: https://appshunter.io/ios/app/sumbox-calculator-and-tools/id6816644434 (this page in markdown: same URL + `.md`)
- Developer: [群利 凌](https://appshunter.io/developer/6810484002)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 159 MB
- Languages: American English, Chinese (Simplified, China), Chinese (Traditional, Taiwan)
- Released: 2026-09-29
- Data updated: 2026-10-31

## What is Sumbox?

Sumbox: all your everyday math, in one box.

Calculate, convert, plan, and split the bill without hunting for another tool. Get a Basic and Scientific calculator plus 30+ free tools. No ads, no sign-up, and calculation history stays on your device. Available in English, Simplified Chinese, and Traditional Chinese.

CALCULATOR
• Basic and Scientific modes, landscape support, and a distraction-free Focus Mode
• Decimal-exact arithmetic: 0.1 + 0.2 = 0.3
• Percent, repeated equals, automatic closing parentheses, and implicit multiplication
• Up to 15 significant digits, thousands separators, and easy-to-read large-number labels
• Tap a number or operator in the expression to select and replace it, then press equals to recalculate
• Memory keys, Reuse from History, and text or CSV history export

30+ TOOLS
• Conversion: Currency Converter (19 currencies, reference rates cached for offline use), Unit Converter (12 categories, including traditional Chinese units)
• Finance: RMB in Chinese Numerals, China Income Tax (pay, bonuses, and annual reconciliation), China Retirement Age (statutory age, retirement month, minimum contribution years, and flexible retirement range under China mainland rules; for reference only), Equal Payments, Equal Principal, Compound Growth, Savings Goal, Installment True APR
• Everyday: Chinese Family Titles (up to 12 relationship steps, with Chinese titles, pinyin, and English explanations), Chinese Converter (Simplified ↔ Traditional Chinese, five calligraphy styles, and image sharing), Sunrise & Sunset (offline sunrise, sunset, twilight, and golden hour; no location access), Discount (Chinese 折 discounts), Split the Bill, Tip & Split, Compare Unit Prices, Date Difference, Date Calculator, Age Calculator (with Chinese zodiac and zodiac sign), Random Numbers
• Health & Travel: BMI (Chinese adult reference ranges), Running Pace, Fuel Cost
• Math: Percent, Percent Change, Circle Area, Right Triangle
• Developer: Hash Calculator (including HMAC), Number Base Converter (including two’s complement), Base64 Encode/Decode, Timestamp Converter, Password Generator, UUID Generator

THEMES
Mint and Clear Contrast are always free. Premium themes—Rice Paper & Ink, Retro LCD, Cyber Neon, Cream Macaron, Deep Space OLED, and Kraft Ledger—bring their own colors, key shapes, fonts, sounds, and matching app icons. Try any theme in full before buying. Unlock All Themes is an optional one-time purchase with Family Sharing and includes themes added later.

PRIVACY
No accounts, ads, analytics, or tracking. History stays on your device; delete or export it at any time. Currency requests send currency codes, never entered amounts. Optional update checks ask the App Store for public app information and can be disabled in Settings.

Exchange rates are reference rates; your bank’s or platform’s quote applies. Financial calculations are not financial advice. China Income Tax applies to China mainland resident individuals’ comprehensive income. China Retirement Age applies to China mainland employees and is subject to local authorities’ determination. Both are estimates for reference only. Check context-dependent Chinese conversions. BMI reference ranges are not a medical diagnosis.

Privacy Policy: https://suanhe.timesoria.com/en/privacy/
Terms of Use: https://suanhe.timesoria.com/en/terms/

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Unlock All Themes | $2.99 | one-time |


## Is Sumbox safe?

Not enough ratings yet to assess Sumbox.

## Is Sumbox legit?

Sumbox - Calculator & Tools has limited verification signals. The AppsHunter Legitimacy Score for Sumbox is 58 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 5 releases)

### 1.6 — 2026-10-26

Refined tool, Settings, and About pages with clearer text and consistent icons for a smoother experience.

### 1.5 — 2026-10-24

Sumbox 1.5
• Meet five chibi character themes, each with its own illustrated scenes, keypad design, and matching app icons. Try any theme in full.
• Browse Classic, Anime, and Chibi categories to find your preferred style.
• Enjoy clearer long numbers and expressions in the calculator.
• Existing Unlock All Themes owners receive all five themes without another purchase.

### 1.4 — 2026-10-21

Sumbox 1.4
• Meet four new anime themes: Sunny Addition, Calm Subtraction, Lively Multiplication, and Thoughtful Division.
• Coordinated character artwork, illustrated backgrounds, key colors, sounds, and matching app icons. Try each theme in full before applying it.
• Refined theme layouts for Basic and Scientific calculators in portrait and landscape on iPhone, iPad, and iPhone Duo, including long numbers and context menus.
• Existing Unlock All Themes owners can use the new themes without another purchase.

### 1.3 — 2026-10-18

Sumbox 1.3
• Optimized for iPhone Duo: layouts adapt to open, book, and tabletop use, avoid the fold, and keep your calculation as you open or close the device.
• Choose Basic or Scientific in portrait or landscape on iPhone, iPad, and Duo. Your choice is remembered; rotation and window changes adjust the layout. Switching modes keeps your expression and M memory.
• New Redeem Code entry in Settings opens Apple's redemption sheet. Restore Purchases remains in Themes & Icons.
• Improved toolbars, keyboard overlap handling, and the RMB in Chinese Numerals sheet on newer systems.

### 1.2 — 2026-10-15

Sumbox 1.2
• New Frost & Persimmon theme: cool mist, warm autumn colors, light and dark appearances, matching icons, and wood key sounds. Included in your existing Unlock All Themes purchase.
• Separate Gregorian and lunar birthday countdowns, with full dates starting on a new line and an explicit Gregorian label for the lunar birthday date.
• A fresh calculator after fully closing the app; ordinary background switching keeps your current calculation.
• Separate history for the calculator and each tool, with independent search, export, clear, and undo.

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## More apps by 群利 凌

- [Timesoria: Diary & Letters](https://appshunter.io/ios/app/timesoria-diary-and-letters/id6811020197)

All apps by 群利 凌: https://appshunter.io/developer/6810484002

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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 2026-10-31.*