Inkflow: Think Visually! ($0.00) Inkflow works like a word-processor for visual thinking. Capture your ideas as easily as with pen and paper, then arrange and reorganize them with your fingers! The Basic Edition is a full featured note-taking and sketching app. It comes with the Fountain Pen with black ink and all the features above. Books max out at 20 pages each, but you can create as many as you like. ★★★ NOTE: To delete ink, tap on the selection then tap delete.