Track daily habits, reminders and progress on Android.
Completely free · Android · Offline tracking and manual backups

Notes, tasks & docs
Turn daily habits and to-dos into a game with experience points and rewards.
Turn daily habits and to-dos into a game with experience points and rewards.
Track recurring daily habits and mark completions without a habit-tracker subscription. Different design, platforms and statistics; no identical garden, flower rewards, public profiles or Habits Garden leaderboard is promised.
Requires an account and stores tasks in the hosted service. Gems, subscriptions and some game items are paid; do not expect all quests or cosmetics free. Different game and statistics from Habits Garden, with health penalties that some people find discouraging. Code is GPL-3.0, but HabitRPG artwork/content uses a noncommercial Creative Commons licence; commercial reuse of those assets is not included. No promise of the same garden, public profiles or leaderboard.
Each comparison covers the workflow described above, rather than every paid feature.