Preview
Number line & interval visualizer (inequality shading)
Shade inequalities and unions, show steps, and export as SVG/PNG.
How it's calculated
Classroom-friendly exports and keyboard shortcuts
Press Enter to regenerate after editing any input, press Ctrl+S for CSV, Ctrl+L to copy the shareable URL, and Ctrl+P to open the print dialog. Share links preserve mode, domain, and interval settings for students.
SVG downloads stay crisp for textbooks and slides, while PNG gives a quick screenshot for LMS uploads. CSV lists every shaded interval and the domain limits for fast documentation.
Frequently asked questions
How do I enter compound inequalities or mixed unions?
Combine clauses with AND / OR (or the ∪ symbol) in the inequality tab. The solver handles each clause, flips signs when coefficients are negative, and merges overlaps into a clean union.
What export options are available for the number line?
Download SVG for crisp printouts, render a PNG screenshot, export CSV rows with endpoints, copy a shareable URL, or print to PDF directly from the browser.