A small vibe-coded web app that lets you follow a sequence of numbers, one step at a time.
Countline saves both the list of numbers and your current progress locally in the browser, so you can close the page and resume where you left off later.
Countline is especially useful for hand-crafting string art.
In string art, you arrange nails around a board and thread a string around them in a specific numbered sequence to create an image. Countline helps you keep track of the current nail number while you work, without losing your place.
You can generate string art nail sequences with tools like String Art Generator, then paste or upload the resulting number list into Countline.
- Paste a comma-separated list of numbers
- Upload a plain text file with a number sequence
- Step through the sequence with a single button
- Save the sequence locally
- Resume from the last viewed number
- Reset progress when starting over
Open index.html in a browser, add your number sequence, save it, and use the next button to move through the list.