The best alternatives to Intermission.page are Intermission for Mac, Janni, and Simple. If these 3 options don't work for you, we've listed a few more alternatives below.
Intermission is a simple app that helps you look away from your screen periodically. It's based on the 20-20-20 rule (every 20 minutes look at something 20 feet away for 20 seconds) but can be adjusted to your liking with multiple customizations.
Janni is a personal time analytics tool that focuses not on billable hours but on you and your time satisfaction. Janni's goal is to enable accurate and effortless visibility into your use of time, from A to Z.
Simple is a new time tracker with a beautiful design. It is free to use and no sign up is required. Simple give its users the best experience with its simple usage and superior support.
The Quester App turns communication over messaging into an additional revenue stream. With the app professionals are able to track time and automatically charge when messaging clients.