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Our statistics and charts at Castle DealNews tell us that you're probably reading this on your cell phone. While we're loath to tell you to stop browsing our site, once you're finished, you could do worse than amusing yourself with these, the five best free mobile apps we've seen this week:

Measure Map Pro for iPhone / iPad ($20 off cartographical fun)

Ultimate Guitar: Chords & Tabs for iPhone / iPad or Android ($3 off guitar tabs and lessons)

Newton Gravity Puzzle for iPhone / iPad or Android ($1 off this physics puzzler)

iRecorder Pro Audio Recorder for iPhone / iPad ($3 off this dictaphone substitute)

Plotaverse for iPhone / iPad ($5 off this photo animation suite)