Look Up is described as 'helps you remember to rest your eyes, using the 20-20-20 rule: every 20 minutes, look up for 20 seconds, at something more than 20 feet away. Look Up is a highly rated health app that helps you keep focused in a healthy way' and is an app in the Office & Productivity category. There are five alternatives to Look Up for Mac, Windows, Linux, Chrome OS and Google Chrome. The best alternative is Iris, which is free. Other great apps like Look Up are Take a Five (Free), Break (Paid), Break-Reminder (Paid) and Healthy Tech (Freemium).
Iris is software which makes monitors healthy for the eyes. With iris you can reduce the blue light emitted from your screen for better sleep, reduce the brightness of your screen without PWM and avoid eye pain.
Break is a simple productivity app to remind you to take a short rest from your computer once in a while. Keep focused and stay productive by taking breaks when needed, using Break to help you remember.
Healthy tech is an all in one solution for mitigating the health risks that are associated with computer use, it forces you to take frequent breaks, prevents excessive use and helps you adhere to your sleep schedule.