Comparison

RedCrab Calculator vs Zero Issues

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Basic & Advanced Calculations
  • Smart Expression Parsing
  • Calculation History & Reuse
  • High-Precision Display
  • Dark Mode & Modern UI
  • VIP Ad-Free Experience
Features
Read 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.

About

Zero Issues

This customizable task organizer helps users manage to-do lists with intuitive sorting and filtering. It allows for deep personalization of lists, tags, and tasks, aiming to be a comprehensive solution for organizing daily activities.

Highlights
  • Intuitive organization
  • Easy sorting and filtering
  • Customizable lists and tags
  • Task management
  • One-stop shop for organizing
Features
Read full description

Designed for Software Developers, usable by anyone. Zero Issues was created to be an issue tracker but has evolved into something way more powerful and way more customizable. Use Zero Issues to make completing tasks tangible and easy with intuitive organization and easy sorting and filtering. Customize every level of the app from Lists and Tags to Tasks. Zero Issues is designed to be the one-stop-shop for organizing your to-do's. Try before you buy! Zero Issues is a paid app, instead of paying without having experienced it and seeing if it's for you, simply pay when you're ready- there's no time limit. Have any feedback or questions? Simply contact me via Gryzle.com. Thank you for your feedback!

Screenshots

RedCrab Calculator4 screens
Zero Issues4 screens

Verdict

The call

The clearest difference is ads: Zero Issues at none against RedCrab Calculator's shown. RedCrab Calculator's advantage is monetization model (free with in-app purchases vs paid) and iOS requirement (15.6 vs 17.0). On price, review sentiment, in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase and Zero Issues sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Scorecard3 real differences · 7 level
RedCrab Calculator versus Zero Issues: the parameters behind the verdict, then further details
ParameterRedCrab CalculatorZero Issues
PriceFreeFree
Rating—4.0 (1 ratings) — better
Positive reviews100.0% of reviews100.0% of reviews
Number of ratings—1 — better
Update frequencyFortnightly—
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.6 — better17.0
Further details — not scored
Size5 MB5 MB
Age rating4+4+
Developer少泽 梁Gryzle LLC

Customer experience

RedCrab Calculator

Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Zero Issues

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

RedCrab Calculator

One-time1
  • 终身会员$1.99
1 purchases

Zero Issues

One-time1
  • Zero Issues - Full Experience$2.99

Questions

Is RedCrab Calculator free?
RedCrab Calculator is free to download, with in-app purchases available.
Is Zero Issues free?
Zero Issues is free to download, with in-app purchases available.
Do RedCrab Calculator or Zero Issues have ads?
RedCrab Calculator shows ads; Zero Issues does not.

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