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

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.

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.

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.

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.

Sumbox 1.1 • New: China Retirement Age — statutory retirement age and month, minimum contribution years, and flexible retirement range under China mainland rules, for reference only. • New: Sunrise & Sunset — offline sunrise, sunset, twilight, and golden hour for cities or coordinates. No location access needed. • New: Chinese Converter — Simplified ↔ Traditional Chinese conversion, five calligraphy styles (seal, clerical, regular, running, cursive), and image sharing that preserves the lettering. • Age Calculator now includes your zodiac sign in displayed, copied, and saved results. • The App filing number is now displayed in Settings, with simpler Settings and Themes pages. • Tap a number or operator in an expression to select and replace it without retyping the calculation.