A free app for Android, by Chuehfu Tech.
This is a free and simple keyboard with all the most important phonetic symbols.
All IPA symbols are grouped by related shape or sound so that they are easy to find. Keyboard layouts are available in QWERTY, AZERTY, Dvorak, Colemak, and customized phonetic order based on the IPA chart.
The app can be downloaded on any device. The main advantage of this app is that it is very easy to use. There is no need to learn how to type. All you need to do is to tap a symbol and it will be inserted into the text. It is useful for people who want to write for the first time in a language.