4D Draw vs Euclidea

4D Draw is a simple vector-graphics app that lets you draw 4‑dimensional figures. It represents each point's first three coordinates in the usual way, while using color to represent the fourth coordinate. A built-in Help menu includes a “How to draw” page for an easy start, followed by a page of “4D construction ideas” to set you on your way towards visualizing 4-dimensional space. 4D Draw is intended for geometry students who want to learn to visualize 4‑dimensional space. People looking for a more recreational introduction to 4D should begin with 4D Maze instead. People looking for an even more recreational introduction to modern concepts of space and symmetry may enjoy the Torus Games or KaleidoPaint.

Euclidea: Sketches is an interactive geometry app intended for creating and exploring geometrical constructions. It is a great companion for the classic Euclidea Puzzles app. You start with an empty board and create your sketch with just a few taps. > Use smart and powerful tools > Choose shapes from a template library > Explore your constructions: they can be changed dynamically > Customize your drawing > Label points > Organize you own drawing collection > Export to photo album ***For Euclidea Puzzles users*** The app is much more than a sandbox for Euclidea. The tools were revised and significantly improved. Since you do not need to count moves anymore, the same constructions can be reproduced faster. ***How to use*** There are 4 modes: Constructing, Decorating, Coloring, and Labeling. The Move and Eraser tools are available in any mode. Other tools are: Point, Segment, Ray, Straight Line, Circle, Polygon Templates (Regular Polygon, Equilateral Triangle, Isosceles Triangle, Right Triangle, Square, Rhombus, Rectangle, Parallelogram, Trapezoid, Isosceles Trapezoid, Right Trapezoid), Midpoint, Perpendicular Bisector, Angle Bisector, Perpendicular, Parallel, Copy Segment, Copy Angle, Circle by 3 Points, Triangle Center Collection (Incenter, Centroid, Circumcenter, Orthocenter), Tangent, Intersection. Hints: Constructing - Drag a circle or other object directly to the desired point until it snaps. - The Segment tool can be used to extend segments. - It is easier to use the Perpendicular tool selecting a line first. Hints: Decorating - Decorations are used to mark a perpendicular, equal angles or segments. - You cannot create a wrong decoration. For example it is impossible to mark segments as equal if their length is actually different. Hints: Coloring - Choose color and style, then tap a point, a circle, or a segment. - You can create segments and points in the Coloring mode. - You can deselect color to change a style only. - The default color is the rightmost in the palette. Hints: Labeling - To hide/restore a label, choose "-" in the letter wheel and then tap a point on the drawing. Hints: Move tool - The whole drawing can be rotated using two fingers when the Move tool is active. - Tap a line or a circle to see their base points that can be dragged. Let's make geometry fun again!