As a bootstrapped company, we will never be able to acquire users through paid channels. We have to think very hard on how to create long term viral growth acquisition channels.
That's why we've just launched an extension that allows users to send audio messages in Gmail. There is a small watermark at the bottom of every email which will drive additional traffic to our app and people who use this extension will be really interested in our Personal CRM.
https://chrome.google.com/webstore/detail/natapp-record-audio-in-gm/pjpambjkhcilibnmeihhfgdkhfelbdkj