The best alternatives to P2K: Pocket to Kindle are Stach, Unhoard, and PocketRocket. If these 3 options don't work for you, we've listed a few more alternatives below.
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Universal-2 by AssemblyAI— Speech-to-Text API for conversational data
Push to Kindle converts web articles into e-books and delivers them to your Kindle account. It allows you to read long-form web articles the same way you would read an e-book purchased from Amazon.
The Push to Kindle app for Android lets you send web articles you encounter on your Android device to your Kindle. The articles can then be opened and read like the books in your library. Read long-form web articles, or just save articles for later reading.