RedCrab Calculator vs + Simple Calc
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.
+ Simple Calc
Perform calculations with a standard calculator that offers extensive customization. Choose from 17 color themes and custom icons, plus enjoy light and dark mode support.
- Standard calculator functionality
- Light and dark mode
- 17 color themes
- Custom icons
- iPhone support
Read full descriptionHide full description
Do the math with Simple Calc. This is a standard calculator that supports light and dark mode, and 17 color themes + custom icons.
Screenshots
Verdict
The clearest difference is in-app purchases: + Simple Calc at none against RedCrab Calculator's 1. + Simple Calc also leads on ads (none vs shown) and update cadence (every 5 days vs fortnightly). RedCrab Calculator's advantage is device support (3 vs 1). On price, review sentiment 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. + Simple Calc asks for nothing beyond the download.
RedCrab Calculator ships an update fortnightly, + Simple Calc every 5 days. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.
| Parameter | RedCrab Calculator | + Simple Calc |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Fortnightly | Every 5 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod — better | iPhone |
| Requires iOS | 15.6 — better | 16.0 |
| Further details — not scored | ||
| Size | 5 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | 少泽 梁 | Alejandro de la Rosa Cortes |
Customer experience
RedCrab Calculator
+ Simple Calc
In-app purchases
RedCrab Calculator
- 终身会员$1.99
+ Simple Calc
No in-app purchases
Questions
Is RedCrab Calculator free?
Is + Simple Calc free?
Do RedCrab Calculator or + Simple Calc have ads?
Which is updated more often, RedCrab Calculator or + Simple Calc?
Other comparisons















