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The free iPad app mem:o [carolineandyoung.com], designed by interaction designers Caroline Oh and Young Sang Cho makes tracking, logging and analysing your quantified-self activities a compelling visual experience.

Exploiting the beauty of bubbles, pie charts and circles, and coated in various playful animations, this application allows one to collect, aggregate and sort all sorts of personal data, ranging from how many books you have read, to when and to whom you have shared your love.

Each activity is represented by a minimalistic circle, of which the actual value is recorded by a simple dragging gesture. All circles are then filtered by activity in a "board" view, ordered over time in a "timeline" view, or aggregated all together in a colorful "calendar" view.