Counters + Tally Converter
You can keep track of multiple counters at once and organize them into "Counting Boards". Choose how much to count by ("step") and what to start at. Negative and non-whole numbers are supported. Numbers can be very large. You can also convert numbers to tallies (integers 1-99,999). There are various settings. It has a home screen widget.
Features
• Keep track of multiple counters on multiple counting boards
• Convert numbers to tallies
• Counter step size and starting point options
• Option to use volume buttons to count
• Export and import counters in settings menu
• 5 theme choices: Auto, Dark, Light, Black Out, and Light Amber
• Counter widget for your home screen
• Change color of counters
• Field to type in current counter steps
Try the Lite Version
https://play.google.com/store/apps/details?id=com.grantojanen.counterlite
More Details
Offline: Yes
Lightweight: Yes, < 1MB
Multi-Window Support (Android 7+): Yes