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Build colour-profile transformations into imaging software.

Collect screen colours and hand palettes to Mac design tools.

Choose a starting colour and explore a related scheme.

Compare revisions of text and data

Microsoft’s emoji artwork with multiple visual treatments and metadata.

A notepad that calculates alongside written working

Engineering worksheets that mix formulas and explanation

Engineering calculations with steps and interactive models

Focused browser calculators for statistical questions

Component calculations for practical electronics

Circuit and electrical formulas grouped by task

Editable calculations with automatic dependency updates

Clean inconsistent data before transforming it into another format

Convert compatible quantities and inspect unit definitions from a CLI

A journaling app that helps you organize thoughts and spot patterns.

Research employers alongside jobs and career advice

Step-by-step SQL practice on themed data tables

Music-gear resale supported by completed-sale price research

Physical constants linked to units and uncertainty guidance