Pocket 991
Calculator help, step by step
$0.99 · Designed for iPad. Not verified for macOS.
Learn by doing across EX, CW and CG50-style calculators. Follow highlighted keys through worked examples, then take over whenever you are ready.
A scientific and graphing calculator that shows you which keys to press.
Pocket 991 brings together familiar EX- and CW-style scientific-calculator workflows, an independent CG50-style graphing calculator, and a large library of interactive tutorials for A-level Maths and Further Maths students.
FOLLOW THE HIGHLIGHTED KEYS
Choose a tutorial or ask how to do something. Clear requests start guidance; broader questions offer relevant operations. Follow a worked example on the calculator itself, then take over whenever you are ready.
SCIENTIFIC CALCULATOR WORKFLOWS
• Polynomial and simultaneous equations
• Normal, binomial and Poisson probabilities
• Statistics and regression
• Matrix and vector calculations
• Complex numbers
• Numerical integration, differentiation and tables
• Fractions, powers and calculator settings
CG50-STYLE GRAPHING
Explore calculations, graphs, tables, equations, statistics and distributions, matrices, recursion, conics, selected 3D workflows and more. The CG50 learning interface includes 234 worked tutorials with model-specific keys, menus and graphing steps.
BUILT FOR YOUR PHONE AND TABLET
Full-screen calculator layouts, tactile key feedback, an integrated question keyboard and optional dictation. Calculations and built-in tutorials work offline. Natural-language interpretation uses Apple Intelligence on compatible devices; availability depends on device, operating system, language and settings.
Pocket 991 is an independent educational calculator and tutorial tool. It is not official calculator firmware and is not made by or affiliated with a calculator manufacturer. Some specialist modes, interfaces and numerical precision differ from physical calculators. Numerical calculus is supported; general symbolic algebra is not. This is a practice tool, not an examination device.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• New independent CG50-style graphing calculator
• 234 new CG50 worked tutorials
• Graphs, tables, equations, statistics, distributions and matrices
• Selected recursion, conic, Dynamic and 3D workflows
• Improved tutorial guidance and calculator-state recovery
• Layout and reliability improvements across iPhone and iPad
The developer, Charlie Candlish, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Charlie Candlish
- Size
- 12.5 MB
- Category
- Education
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Charlie Candlish
