Did you know you can open a chat in WhatsApp with any number without saving first into contacts by opening in your browser the link 'wa.me/123456789' (using the prefix+number desired)?
Source: https://faq.whatsapp.com/en/android/26000030/

Originally that link was longer and more difficult to remember, so I made this tiny app to help in the process.

Since then I have added multiple functionalities (enter message, list of country codes, save recent, open recent calls via add-on, and a few more) but always with these three principles:
1) Make the smaller app possible. This means no extra unrelated content, no extra libraries and no useless things
2) Use as few permissions as possible.

If you want a small tool to help you open numbers in WhatsApp, try it.

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Disclaimer: This app is not affiliated with nor endorsed by WhatsApp Inc.

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