The best alternatives to Colorgram are Dark Reader, Darkness, and Dark Mode List. If these 3 options don't work for you, we've listed a few more alternatives below.
What do you think of Colorgram?
Intercom— Startups get 90% off Intercom, the complete AI first customer service platform
Dark Reader is a free browser extension available for Google Chrome and Mozilla Firefox. It lets you apply a dark color scheme to any website so that you can enjoy browsing your favorite websites at night or in the dark. The extension is available in respective extension stores and can be quickly installed to any of the browsers mentioned above.
Darkness is a browser extension that provides beautiful dark themes for popular websites such as Google, Facebook, Gmail, Twitter, and dozens of others
Night Eye is a browser extension that enables dark mode on any website you visit. It does not ruin your browsing experience by simply inverting images.