RedCrab Calculator vs Smart Calculator·
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RedCrab Calculator
This powerful scientific calculator offers a modern UI and robust engine for users of all levels. It handles basic arithmetic to complex engineering equations with smart expression parsing and a high-precision display. Enjoy a seamless calculation experience with features like history recall and dark mode.
- Basic & Advanced Calculations
- Smart Expression Parsing
- Calculation History & Reuse
- High-Precision Display
- Dark Mode & Modern UI
- VIP Ad-Free Experience
Read full descriptionHide full description
The RedCrab Calculator is an efficient and powerful tool designed for students, engineers, professionals, and everyday users. Whether you're handling simple daily expenses or complex engineering algebra, it provides a precise and lightning-fast calculation experience. Combining an elegant modern UI with a robust calculation engine, every tap is a seamless experience. Key Features: - Basic & Advanced Calculations : Flawlessly supports basic arithmetic alongside advanced scientific functions including trigonometry (sin, cos, tan), logarithms (log, ln), exponents (^), roots (ⁿ√x), and modulo (%). - Smart Expression Parsing : Supports nested parentheses and long expression inputs. It strictly follows mathematical order of operations, displaying exactly what you calculate to ensure accuracy in complex equations. - History & Result Reuse : Automatically saves your calculation history. The dedicated "Ans" button allows you to instantly recall your last answer, making multi-step calculations a breeze. - High-Precision Display : Optimized large number display logic supports showing more significant digits, eliminating the frustration of forced and hard-to-read scientific notation. - Dark Mode & Modern UI : Native support for Dark Mode to protect your eyes. Carefully tuned button layouts, smooth highlight touch feedback, and dynamic font scaling deliver an ultimate user experience. - VIP Privileges : Unlock VIP membership to enjoy a pure, ad-free, immersive calculation experience, along with access to exclusive premium features. Scientific Calculator: Making numbers clearer and calculations smarter.
Smart Calculator·
This app offers a comprehensive suite of mathematical calculation tools, from basic arithmetic to advanced calculus and matrix operations. It also includes unit conversions and saves your calculation history for easy review. Personalize your experience with themes and night mode.
- Comprehensive calculation functions
- Advanced mathematical operations
- Unit conversion
- Calculation history
- Personalized themes and night mode
Read full descriptionHide full description
Smart Calculator is a powerful mathematical tool that integrates a range of complex computing functions into a simple and user-friendly interface. Whether you encounter mathematical calculation problems in your studies, work, or daily life, this calculator can provide timely and accurate solutions. Main features: Comprehensive calculation functions: including basic four operations (addition, subtraction, multiplication, division), square, square root, percentage calculation, trigonometric functions (sine, cosine, tangent), logarithm, exponent, factorial, etc. Advanced mathematical operations: Supports advanced mathematical functions such as calculus (derivatives, integrals), complex number calculations, matrix operations, statistical calculations, etc. Unit Conversion: Equipped with rich unit conversion functions, including conversion between multiple units such as length, weight, area, volume, speed, temperature, etc. History: Automatically save your calculation history, making it convenient for you to view and review previous calculation processes at any time. Personalized settings: Provides a variety of themes and color choices to meet your personalized needs. Support night mode to protect your vision. Application scenario: Learning: Whether it's elementary school students or college students, multifunctional calculators can help you solve calculation problems in math assignments and exams. Job: Engineers, scientists, accountants, and other professionals can use this calculator for complex mathematical calculations and data analysis. Life: In daily life such as shopping, budgeting, and investing, multifunctional calculators can also provide you with accurate calculation results. In short, a multifunctional calculator is a mathematical tool that is comprehensive, easy to operate, and suitable for various scenarios. It will become your capable assistant in learning, work, and life. Come and download to experience it!
Screenshots
Verdict
The clearest difference is in-app purchases: Smart Calculator· at none against RedCrab Calculator's 1. Smart Calculator· also leads on ads (none vs shown). RedCrab Calculator's advantage is update cadence (fortnightly vs every 7 months). On price, device support and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase. Smart Calculator· asks for nothing beyond the download.
RedCrab Calculator ships an update fortnightly, Smart Calculator· every 7 months. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | RedCrab Calculator | Smart Calculator· |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.3 (4 ratings) — better |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | — | 4 — better |
| Update frequency | Fortnightly — better | Every 7 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 5 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | 少泽 梁 | 瑞媚 杨 |
Customer experience
RedCrab Calculator
Smart Calculator·
In-app purchases
RedCrab Calculator
- 终身会员$1.99
Smart Calculator·
No in-app purchases
Questions
Is RedCrab Calculator free?
Is Smart Calculator· free?
Do RedCrab Calculator or Smart Calculator· have ads?
Which is updated more often, RedCrab Calculator or Smart Calculator·?
Other comparisons















