| Core Identity |
| Developer | 沃林 何 | Impala Studios | Apple | Appgeneration Software | 7th Gear | Desmos | Google | Tim O's Studios, LLC |
| Category | Utilities | Utilities | Utilities | Productivity | Utilities | Education | Education | Utilities |
| Platform | Android, iOS | Android, iOS | Android, iOS | Android, iOS | iOS, Android | iOS, Android | Android, iOS | iOS, Android |
| Store Metrics |
| Rating | 4.7 / 5 | 4.7 / 5 | 3.0 / 5 | 4.7 / 5 | 4.8 / 5 | 4.3 / 5 | 4.8 / 5 | 4.9 / 5 |
| Ratings Count | 158 | 1,715,926 | 9,319 | 577 | 4,260 | 1,244 | 733,139 | 34,074 |
| Price | Free | Free | Free | Free | $0.99 | Free | Free | Free |
| Release Date | Aug 2, 2018 | Oct 22, 2010 | May 10, 2016 | Nov 24, 2020 | May 2, 2011 | Jun 18, 2013 | Oct 17, 2014 | Aug 31, 2012 |
| Last Updated | Aug 2, 2018 | Apr 23, 2026 | Dec 12, 2025 | Jul 4, 2024 | Dec 9, 2020 | Mar 12, 2026 | Feb 12, 2026 | May 2, 2025 |
| Sentiment & Reviews |
| Sentiment | - | mixed | - | mixed | mixed | excellent | mixed | mixed |
| Score | - | 45/100 | - | 55/100 | 55/100 | 85/100 | 45/100 | 65/100 |
| Praises | - | - All-in-one utility including scientific functions and unit converters provides significant daily value
| - | - Simple and accurate calculation logic provides reliable utility for everyday math tasks
| - Simple and accurate calculation tools provide reliable utility for everyday personal and business tasks
- Integrated note-taking and calculation logs assist users in managing complex multi-step financial references
- One-time purchase model offers a fair value proposition compared to subscription-based calculator alternatives
| - Versatile graphing and calculation tools provide academic utility for students and engineering professionals
- Intuitive interface design makes complex mathematical visualization accessible for casual and advanced users
- Creative features like audio tone generation and custom color palettes encourage non-academic exploration
| - Step by step math explanations provide significant academic support for students across various grade levels
| - Simple and accurate calculation interface provides reliable utility for everyday household budget management tasks
|
| Complaints | - | - Removal of the running total feature post-update disrupts established user calculation habits
| - | - Post-update UI changes remove essential features like real-time sum display and quick answers
| - Recent design changes post-update removed critical quick-answer displays and altered input box functionality
- Technical regressions post-update cause application instability and unexpected navigation to the device lock screen
- Widget functionality remains broken or unresponsive on specific iPad and iPhone hardware configurations
| - Lack of a native dark mode causes eye strain during extended night-time study sessions
- UI regressions in the latest update make function selection and list management cumbersome
- Inconsistent behavior with external hardware like Bluetooth keyboards limits productivity on tablet devices
| - Inaccurate problem recognition and incorrect solutions frequently frustrate users following the latest update
| - Post-update UI regressions remove critical features like real-time sum display and quick answer feedback
|
| Requests | - | - Integration of currency converter and memory functions into the core stock calculator experience
| - | - Integration of advanced conversion tools like currency and unit converters for better utility
| - Integration of specialized conversion tools like currency and unit converters into the standard interface
- Advanced mathematical features including graphing capabilities and expanded scientific function buttons
| - Integration of geometry and 3D graphing modes to match the functionality of the web version
- Persistent settings for interface preferences like contrast and text size to avoid manual reconfiguration
| - Expanded camera scanning area would allow users to capture and solve longer math problems
| - Integration of advanced conversion tools like currency and unit converters for standard calculator functionality
|
| Strategic Intel |
| Strengths | - Audio-feedback mechanism differentiates the user experience
- Diverse skin-switching options provide a creative hook
| - 200 million download footprint provides massive top-of-funnel acquisition
- All-in-one utility design creates high daily session utility
- VoiceOver and high-contrast accessibility features expand addressable market
| - Native iPadOS and Apple Pencil integration
- Math Notes allows real-time variable manipulation
- Zero-cost utility for ecosystem users
| - Persistent data storage creates high switching costs
- 30+ currency converter provides utility beyond basic math
| - Leather-textured UI creates distinct brand identity
- Integrated note-taking provides utility beyond arithmetic
- One-time purchase model avoids subscription fatigue
| - Proprietary math engine enables complex calculus visualization
- Accessibility suite functions as a B2B distribution moat into institutional partnerships
- Ad-free interface drives high academic trust
| - Google-backed OCR engine provides industry-leading handwriting recognition
- Pedagogical focus on step-by-step logic builds brand trust
- 24/7 availability replaces traditional tutor costs
| - Clean interface avoids feature bloat
- Apple Watch support increases engagement frequency
|
| Weaknesses | - Zero update activity since 2018
- Lack of advanced memory or financial functions
| - Removal of running total feature disrupts power-user calculation habits
- Aggressive subscription prompts drive high churn in the free tier
- UI scaling issues on non-full-screen devices hinder input visibility
| - Low user rating (2.98) suggests UX friction
- Lack of step-by-step explanations for solutions
- Basic history management compared to power-user alternatives
| - 0.3★ rating gap between iOS and Android
- Removal of real-time sum display in latest release
| - 0.4★ rating gap between Android and iOS
- Broken widget functionality on newer hardware
- Lack of modern graphing capabilities
| - No native dark mode despite high-frequency user requests
- UI regressions in the latest update make function selection cumbersome
- Inconsistent Bluetooth keyboard support limits tablet productivity
| - Premium tier pricing exceeds the category median
- OCR regressions in the latest release drive negative sentiment
- Limited scanning frame size restricts complex problem capture
| - Post-update UI regressions remove running total
- Technical instability causes crashes during use
- Aggressive monetization for basic features
|
| Pricing | free | freemium | free | freemium | paid | free | freemium | subscription |
| Momentum | Zombie | Active | Maintenance | Maintenance | Zombie | - | Maintenance | Maintenance |
| Update Cadence | 2 versions, 1 majors/6mo, ~2790d avg | 5 versions, 3 majors/6mo, ~14d avg | 1 versions | 5 versions, 1 majors/6mo, ~250d avg | 5 versions, 3 majors/6mo, ~897d avg | - | 5 versions, ~72d avg | 5 versions, 1 majors/6mo, ~105d avg |
