What do you think about OpenPhone.co?

I would rework the headline, the subheadline works better in your case.
i.e. :

• H1: Stop giving away your private phone number to strangers
• H2: Create a new phone number with 1 tap. Share it with anyone while keeping your own personal number safe. Have as many numbers as you want with Unlimited text, Voice, mms from within one beautiful app.

Also:

Rated 4.7 stars on the App Store

Put a link to the app, always helps!

The design looks clean and the message it's clear! I like it, congratulations!! 🎉

Thanks for coming to us for feedback, Daryna! This landing page is slick. There are a lot of value props all over the place. Looks like your app delivers and people like it. <-First impression thoughts.

Here're my thoughts based on your questions:

1. Does the page effectively communicate the value of OpenPhone for founders?

Yes! But, perhaps not succinctly enough. There's a lot. I'm curious about what's the most compelling value offer to founders. I'm not sure having a business phone number in an app hits it. Google Voice offers this. But Google Voice was clanky. You know what stood out the most to me? "#1 Business phone app". Perhaps because it's simple and folds in all of the value that having a separate business phone would entail. I mean, let's be honest, if we could have a completely separate cell phone for business that didn't take up any additional physical space I think we would. We want it separate. But that's not practical.

2. Does it convince you to get an OpenPhone number?

If I was in the market, yes. I think I would try it for free.

3. Which parts of the page didn't sound true or appeal to you?

"Choose your perfect phone number." The reality is that there is a limited list. I know that. I don't think this part needs it's own section.

"Fanatical customer support." While I think this is important, I'm not sure it would influence my decision to try OpenPhone during this first encounter with a landing page. I think you do a better job at "showing" this instead of "telling" by having the intercom integration which I liked!

4. Did anything stand out as confusing?

I don't think so! Everything was pretty clear and comprehensive.