This is a simple product out of my learning journey of Web3. A special shout-out to Nader Dabit for his great Web3 tutorials, which helped me a lot and inspired this product.
This project is fully open-sourced. You can read the documentations here.
The contract is deployed on Polygon. You need to connect to the Polygon Mainnet and buy some MATIC to pay the gas fee to record your messages, which is about $0.01 per message when MATIC is ~$1.7 (how-to).