Here are some features of Timer.Coffee that you may find useful.
A lot of recipes and brewing techniques.
App currently features more than 30 recipes in different brewing techniques such as Hario V60, Aeropress, Chemex, French Press, Clever Dripper, Kalita Wave, Wilfa Svart Pour Over and Origami Dripper. More recipes are coming soon!
Brew as much coffee as you wish.
Use the coffee calculator to tweak the coffee or water quantities in the recipes. All the brewing steps will adjiust automatically.
Spread the word.
You can easily share your favorite recipes with friends. They'll be able to brew with them even if they don't have the app installed.
Free and open-source.
Source code is available on Github. You can request new recipes or features via Github issues. Also, you can support the development and buy me a coffee.