6+ iOS apps & games curated and reviewed
If you already know Complex RPN Calculator, this is the deeper bench. 6+ john coddington apps and games for iPhone, all reviewed and ranked by user rating, recency, and download trend as of April 2026.
This scientific calculator utilizes a four-level stack and natively handles complex numbers. It allows users to input and view numbers in both polar and rectangular formats, remembering its state and offering 10 memory locations.
This app assists children with coordination challenges in learning to write letters and numbers. It offers adjustable trace sizes and provides auditory feedback upon completion. Users can choose between tracing modes or a free-drawing doodle mode.
This app provides an alphabetized keyboard for typing simple messages. It supports English and Spanish and can be configured to speak keys as they are pressed, aiding in communication.
This educational game helps young children learn numbers and letters in English and Spanish through interactive play. It enhances hand-eye coordination and spatial reasoning while encouraging creativity and interaction.
Play and create Sudoku puzzles with a unique retro interface. Offers five difficulty levels and helpful aids for players. Includes a solver to check puzzle solvability and uniqueness.