Got Questions?
If you can't find what you're looking for, get in touch.
Product/How it works
You define your niche, and the system helps you find relevant videos, generate comments, and place them naturally inside active conversations.
No. You can use built-in search to quickly find relevant content, and the system helps you identify where your audience is already active.
Currently, only YouTube is supported. We're working on expanding to other platforms soon.
Control and safety
Yes. Every comment is created in draft first. You can edit, approve, delete, or regenerate anything before it goes live.
No. Comments are designed to blend in with real conversations, and posting is spaced out to reflect natural user behavior.
Yes. Activity is structured to reflect natural user behavior, including timing and variation, to avoid spam patterns.
Results/Getting started
Yes. Instead of relying only on your own content, your brand appears inside conversations that already have attention, increasing visibility and engagement.
Results vary by niche, but most users see increased visibility and engagement shortly after starting, especially on active videos.
Very little. Most of the process runs in the background, with optional review and adjustments when needed.
Yes. You can start with a trial and see how it performs before scaling.
Trusted by product builders
Mainline is built on the habits that make the best product teams successful: staying focused, moving quickly, and always aiming for high-quality work.
We're misusing Mainline as a CRM and it still works!
Amy Chase, PM
Mercury Finance
I was able to replace 80% of my team with Mainline bots.
Jonas Kotara, Lead Engineer
Mercury Finance
Founder Mode is hard enough without having a really nice PM app.
Kevin Yam, Founder
Mercury Finance
I can use the tool as a substitute from my PM.
Kundo Marta, Founder
Mercury Finance