Algebraic entry. Full on-screen history (multi-line display). Use your phone's keyboard or on-screen buttons. Usual functions: trig, log, etc. Parentheses. Copy to clipboard.
v2.9.3: xxhdpi (HTC One/Samsung Galaxy S4) support. Accessibility.
v2.9.2: High-res icons.
v2.9.1: New 10" portrait layout. Divisors, Factors.
v2.9: Improved on-line help. New 7" and 10" layouts. Slightly improved accessibility.
v2.8: Fix text entry on tablets. Clearer error messages. Choice of output base. Thousands separators in large integers.
v2.7: Don't hide the action bar post-Gingerbread. Better error reporting.