Two stars for the ambition... but I had to request a refund. – Grafio 4 - Diagram Maker Review

Version 4.2.3. The UI is just too broken to use. Snapping object edges to the grid doesn't work, nor does manually setting the vertical sizes of basic objects. Some objects (e.g. UML diagram objects) can't have background colors set; they have to be transparent. Arrows on lines only work in one direction, and it defaults to the opposite way you drew the line. Arrows also don't snap to grid or objects properly. The touch/pen handoff doesn't exactly work... sometimes my finger draws ink lines, sometimes it box selects. The "ignore touch input" decides whether or not it wants to work. With touch blocked, sometimes I can't select objects at all (with pen or touch). I love the concept, but $9.99 for an unusable app isn't really something I could swallow. :/
Review by EvAveMananShar on Grafio 4 - Diagram Maker.