Growth experiments for newsletters
Newsletter growth is a compounding game. Every subscriber who stays increases the value of your list. The best newsletter operators focus on three things: getting found (discovery), getting opened (subject lines and consistency), and getting shared (referral mechanics). If your open rate is above 40% and your content is good, growth is mostly a distribution problem.
Key metrics for newsletters
subscriber growth rate
open rate
click-through rate
referral rate
Common growth problems for newsletters
Your email list doesn't open your emails
You built an email list but open rates are tanking. Subscribers joined and stopped caring. Your newsletter feels like it's going to a graveyard. Industry average open rates for SaaS are 21-25%, but top indie newsletters like Lenny's Newsletter or The Hustle consistently hit 40-50%. The gap is almost always about deliverability and content quality. ConvertKit's own data shows that sending to unengaged subscribers actively hurts your sender reputation, which drags down open rates for everyone on your list - including people who want to hear from you. A list of 500 engaged subscribers will outperform a list of 5,000 where most people ignore you.
acquisitionNobody uses your referral program
You built a referral program expecting viral growth, but users aren't sharing. The referral page gets visits but zero invites go out. This is one of the most common growth frustrations.
referralYour social media posts get no engagement
You post consistently on Twitter/LinkedIn but get crickets. No likes, no comments, no followers. The algorithm seems to hate you. Here's the uncomfortable truth: most founders and startup teams post about their product when nobody cares about their product yet. People follow people, not products. Pieter Levels grew to 400k+ Twitter followers by sharing his building journey, revenue numbers, and hot takes - not by tweeting product features. The compounding nature of social means the first 3-6 months feel pointless, but founders like Daniel Vassallo and Arvid Kahl have shown that consistent value-first posting eventually breaks through.
acquisitionNobody reads your blog posts
You're publishing blog posts every week but traffic is flat. Posts get a handful of views on day one, then nothing. Buffer found that 80% of their blog traffic came from just 5% of their posts - the rest was dead weight. The average blog post gets zero shares according to Backlinko's analysis of 912 million articles. Content marketing feels like shouting into a void because you're creating content nobody asked for, and distributing it nowhere. Most startup teams treat content as a checkbox activity instead of a compounding growth channel.
acquisitionNo one talks about your product online
Your product exists in a vacuum. No mentions on Twitter, no Reddit threads, no blog reviews. It's like you're invisible to the internet. Dropbox solved this with their referral program that gave both sides extra storage - it drove 3,900% growth in 15 months. You don't need that scale, but you need something that makes sharing feel natural. Most products don't get talked about because they don't create a 'moment' worth sharing. Think about it: when was the last time you tweeted about a tool that just worked fine? Products need to create delight, surprise, or a visible output to trigger word of mouth. Even a simple thing like Notion's shareable page links turned every user into a distributor.
acquisitionGrowth tips for newsletters
Build a referral program with tiered rewards. Morning Brew grew to 4M subscribers by offering t-shirts and mugs for referrals. Start with digital rewards.
Cross-promote with newsletters of similar size. Swapping recommendations is free growth with high-quality subscribers.
Create a 'best of' landing page that showcases your top 5 issues. New visitors need to see what they're signing up for.
Test subject lines obsessively. A/B test every send. The difference between 30% and 50% open rate is often just the subject line.
Publish on a consistent schedule. Subscribers who know when to expect your newsletter open at higher rates than random senders.
Companies to learn from
These companies have published growth experiments and strategies that newsletters can learn from. Our playbook library includes experiments inspired by their approaches.
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