If you want an easy way to search and retrieve voice messages on WhatsApp, EchoFox could be a good choice. It transcribes and summarizes WhatsApp audio messages, giving you quick access to written transcriptions and summaries right in your WhatsApp chat. It supports more than 90 languages and prioritizes user privacy with end-to-end encryption and secure storage, wiping out transcriptions after 24 hours. EchoFox also provides an API for integration with other messaging platforms like Facebook Messenger, Instagram and Telegram, so it can be used as a utility for voice communications.
Another option is WhisperBot, an AI assistant that transcribes voice messages into text with high accuracy and speed. Built with OpenAI technology, it supports more than 57 languages and integrates directly with WhatsApp without requiring any additional apps. WhisperBot prioritizes security by using WhatsApp's end-to-end encryption and deletes voice messages and transcriptions after 30 minutes, so it's a good option for handling long voice notes without hassle.