EqualMath

Designed for use with stylus + iPad, the current version 2.4.0 enables quick drawing of basic elements such as points, lines, and planes to assist with theoretical exploration, and supports function graph plotting.
Basic features are free
In addition to the geometry functions, the note-taking feature is also one of the core functions. Notes can be pinned to the page to display the most important steps, and unnecessary or irrelevant strokes can be erased to avoid distraction.
Other features include:
1. Handwritten uppercase letter recognition: Primarily for quickly naming vertices when drawing geometric figures. When this switch is turned off, handwritten naming is supported.
2. Export images to photo album: One-click export without watermarks.
3. Select images from photo album: One-click import for display only, without recognition capability.
4. Points, lines, and planes: Select as needed. The key feature is the ability to drag a new point from the vertex of a figure on the page, which can replace selecting point elements from the menu.
5. Lasso tool: Primarily for selecting point elements, with three methods: drawing a line near points with the lasso, drawing a line through point elements with the lasso, and drawing a small circle to enclose point elements with the lasso.
6. Coloring tool: Can color closed geometric figures and regions, with a certain degree of dynamic perception of surrounding area changes.
7. Canvas expansion: The canvas size dynamically expands in all directions as strokes increase, but canvas scaling is not yet supported.
8. Function graphs: Can plot unary expression graphs and parametric equations.
9. Multi-point Linkage: Supports multi-point linkage, enabling the exploration of geometric multi-point dynamic problems to a certain extent.