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Android scientific calculation with symbolic and graphical tools

A handheld-style scientific calculator for Android

Linked mathematical views for algebra, geometry and graphs

Free voice calculator you speak to, in the browser or on iPhone.

Formulas and notes arranged on a mathematical worksheet

Topic-based calculators for practical questions

Mathematics and practical calculators by subject

Arithmetic, finance and programming modes in one app

Integration with visible input, steps and graphs

A searchable catalogue of calculations and conversions

Air-travel carbon estimates with a published methodology

A maintained HP-42S calculator simulator

Visual calculator forms with custom price rules

Graph equations, inspect points and evaluate functions

Trace crypto cost-basis calculations and the lots behind each result

Equations explored through graphs and symbolic methods

Review catalog options and product-plus-shipping cost before listing

Bill software usage and compare each customer's revenue with costs

Product-based cloud cost estimates

A project workspace for to-do lists, Kanban, Gantt-style timelines, dependencies, and time costs.

Connect employee hours, activity review, attendance, project costs, and billing in one system.

A project suite with WBS tasks, Gantt and Kanban, resource plans, costs, and project reporting.

Core accounting with flexible billing and period-based revenue

Capture employee labor time in web or mobile timesheets and report it by project.