One tap adds one
Your tallies sit right on the Home screen. If your thumb gets ahead of you, use Undo.
Notchers is coming soon
Make a tally and tap it to add one. Notchers keeps the history on your phone, so it still works without a signal.
For iPhone and Android.

The basics
Use it for cups of coffee, workouts, birds you spot or stock checks at work. If you can count it, you can make a tally for it.
Your tallies sit right on the Home screen. If your thumb gets ahead of you, use Undo.
Tallies are stored on your phone first, and you do not need an account to start counting.
See when each tap happened, then compare one period with another on the Stats screen.