Calctan vs ice sudoku

Calctan is a high-precision scientific and financial tape calculator designed for iPhone and iPad. Built for students, engineers, accountants, and business professionals, Calctan bridges the gap between scientific computing and practical everyday finance. Edit complex formulas with ease, audit running totals on a printable tape, and enjoy a distraction-free workspace with no ads. KEY FEATURES 1. SMART FORMULA WORKSPACE • Direct Cursor Editing: Tap anywhere in your expression to fix numbers or operators instantly—no need to clear the expression and start over. • Live Syntax Validation: Real-time calculation preview with automatic balancing of parentheses as you type. • Fluid Multi-Line Display: Expressions scale dynamically so long formulas are never cut off. 2. ADVANCED SCIENTIFIC ENGINE • Complete Math Suite: Trigonometric functions (radians/degrees, inverse, hyperbolic), factorials, permutations, powers, roots, modulo, and logarithms. • True Order of Operations: Context-aware order of operations with high-precision calculations that minimize floating-point rounding errors. • Built-in & Custom Constants: A library covering mathematics, physics, and chemistry, plus customizable slots for your own tax rates or business ratios. 3. ACCOUNTING TAPE & REPORT EXPORT • Auditable Calculation History: Every calculation is automatically logged on a persistent digital paper tape. • Label & Categorize: Add custom notes, tags, and project labels to track expenses, homework problems, or client totals. • Batch Operations: Select multiple past entries to instantly calculate a running total. • AirPrint & PDF Reports: Generate itemized, professional calculation sheets to share, save, or print directly. 4. DESIGNED FOR PRODUCTIVITY • Multitasking on iPad: Full support for Split View, Slide Over, external keyboards, and trackpads. • iCloud Synchronization: Keep your saved formulas, constants, and calculation history unified across iPhone and iPad. • Customizable & High-Contrast Themes: Handcrafted color palettes designed to minimize eye strain during long study or work sessions. • Private & Ad-Free: No tracking, no data collection, and no subscription is required to calculate. We do not collect your data; calculations stay on your device and, if enabled, sync privately through your personal iCloud account. PERFECT FOR: • STEM & College Students: Algebra, calculus, physics, and exam prep with clear, step-by-step editing. • Finance & Accounting: Tax prep, budgeting, invoices, and expense verification with itemized tapes. • Retail & Small Business: Quick customer totals, discount percentages, and printable calculation logs.

【High performance, rich sudoku bank】 ice sudoku uses an efficient random number algorithm and uses multi-threaded concurrent technology to efficiently utilize Apple A series processors. It can quickly generate 5 types of Sudoku of different difficulty levels (beginner, easy, medium, difficult, and top). It provides a comprehensive question bank covering SE 1.2~11.9 and supports search and random retrieval. (1) Beginner, easy, medium, difficult, and top Sudoku special skill questions: 999 questions each (2) Higher algorithm level Ice Sudoku Sudoku (SE 8.3-SE 9.2): 999 questions (3) Peak algorithm level Icey Comet Sudoku (SE 8.8-SE 10.5): 999 questions (4) Super first-class difficulty Sudoku (SE 10.5+): more than 100 questions 【Extreme logic, advanced challenge】 It has a complete logic analysis system that supports step-by-step solutions for any Sudoku, helping you sort out the logical reasoning of each step. It has a rich library of targeted Sudoku training to help you become a Sudoku master. Exclusive challenge mode, test level, speed challenge, unlock exclusive icons, so that Sudoku is no longer boring. [Privacy protection, offline play] The developer promises not to collect any data from ice sudoku, and you can enjoy all functions without network connection, no ads, no in-app purchases, and fully protect your privacy and security. [High freedom, customizable] Supports free circle change to painting, especially suitable for iPad with Pencil. Supports Sudoku customization, where the numbers are determined by you, and there are templates to generate axial symmetric Sudoku. The archive system is complete, and you can export 81 Sudoku strings to facilitate the management of your Sudoku library and free sharing. [Rich functions, simple and intuitive] The interface design is simple and clear, and continues to improve. iOS 13 and above devices support Sudoku scanning recognition. Automatically fill in candidate numbers, error protection, highlight candidate numbers, candidate number background color adjustment, quick fill, and more convenient functions are waiting for you to explore. [Continuous updates, support feedback] Whether you are a master who can solve all kinds of Sudoku easily, or a Sudoku beginner, you can find the right questions for you here. If you have better suggestions, please contact us so that we can hear your voice! Official website of ice sudoku: https://github.com/tropicalwzc/ice_sudoku.github.io