Question 1

How do the referrals work?

Accepted Answer

By default, people that sign up to your list can invite friends to climb up the list. You can choose to provide further incentives like discount codes or early access to your product.

Question 2

Do I have to use the referral system?

Accepted Answer

No! You can also disable them and simply use Letterby to collect sign ups and send newsletters.

Question 3

What if I already have an existing audience?

Accepted Answer

We have a simple CSV import feature. You can export your list of any app and import it into Letterby. In case you run into issues or need help reformatting your file, reach out and we can help.

Question 4

Can I send emails?

Accepted Answer

Yes, you can easily create a new email and send it to the people who signed up to your list. Send a newsletter, product updates and more with a super easy to use interface.

Question 5

Who's behind this?

Accepted Answer

Letterby is part of Evernomic, a venture studio building media startups. We acquired it in 2025 and are committed to making it the best viral launch tool out there. This project was founded by Maxime and Piet who are still on board as advisors.

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Questions & answers

Other questions? Read the documentation or reach out.

What is a contact?

What if I already have an existing audience?

What payment methods do you offer?

Can I send emails?

What happens when I reach the plan limit?

Who's behind this?