ConvertKit vs Customer.io
Quick verdict
ConvertKit and Customer.io are both excellent email & newsletter tools, and the right pick depends on what you need. ConvertKit is the email-first operating system for creators, now Kit, while Customer.io is automated messaging across email, push, SMS and in-app. For most people, ConvertKit is the safer default thanks to its wider adoption — but Customer.io can be the better fit for the right workflow.
ConvertKit vs Customer.io is one of those comparisons that comes up again and again. Both are strong email & newsletter tools, both have loyal fans, and both could be the right call depending on your situation.
We track hundreds of email & newsletter tools on DesignBookmark, so we've put them side by side below: what each one is, where they overlap, how they differ, and a clear answer to which you should choose.
No fluff and no fabricated benchmarks — just an honest, practical comparison to help you decide fast.
At a glance
| ConvertKit | Customer.io | |
|---|---|---|
| Type | Email & Newsletters | Email & Newsletters |
| Pricing | Freemium | Freemium |
| On DesignBookmark | Featured pick | Listed |
| Categories | 1 | 1 |
Pricing is a general guide and changes often — always confirm current plans on each tool's site.
What they have in common
At a high level, ConvertKit and Customer.io are after the same thing. Both sit in our email & newsletters category, both are aimed at designers, developers and creators, and both are built to make that job faster and more enjoyable.
So if you're only going to use one, you won't be missing out on the fundamentals either way — the question is which one's particular take on email & newsletter tool suits you best. That's what the rest of this comparison digs into.
ConvertKit
ConvertKit is the email-first operating system for creators, now Kit. It earns its reputation by being genuinely useful day to day, not just impressive in a thirty-second demo.
Compared with Customer.io, it's the one to reach for when reliability beats raw feature count. On the pricing side, ConvertKit is generally freemium — always click through to confirm current plans, since they change often.
Customer.io
At its core, Customer.io is automated messaging across email, push, SMS and in-app. The team behind it ships steadily, so it keeps improving rather than standing still.
Against ConvertKit, it tends to win people over when simplicity and speed matter more than a sprawling feature list. On the pricing side, Customer.io is generally freemium — always click through to confirm current plans, since they change often.
How to choose between ConvertKit and Customer.io
Pick ConvertKit
Choose ConvertKit if you want the more established, widely-adopted pick that most people reach for first.
Pick Customer.io
Choose Customer.io if it clicks with you in a quick hands-on test — that's the real deciding factor.
Pricing & how you'll pay
ConvertKit and Customer.io use broadly similar pricing models, so cost is unlikely to be the deciding factor. Focus instead on which one fits your workflow — and always confirm the latest plans on each site, since pricing changes often.
Workflow & learning curve
The best email & newsletter tool is the one that disappears into your routine. Think about which interface feels more natural to you, which integrates with the apps you already use, and which you'd actually open every day. A short free trial of each tells you more than any feature chart.
Scope — all-rounder or specialist
Both cover similar ground here, so neither is obviously the "bigger" tool. Judge them on how well they do the specific job you care about most, rather than the length of their feature lists.
Momentum & community
A tool is only as good as the team and community behind it. Both ConvertKit and Customer.io are actively maintained and listed on DesignBookmark for that reason — but it's worth a quick look at each one's changelog and community to see which is moving in a direction you like.
Frequently asked questions
Is ConvertKit better than Customer.io?+
Neither is universally "better" — they're both strong email & newsletter tools, which is why people compare them. ConvertKit suits you if you want the email-first operating system for creators, now Kit; Customer.io suits you if you want automated messaging across email, push, SMS and in-app. The best way to decide is to try both on a real project.
What's the difference between ConvertKit and Customer.io?+
They overlap a lot — both are email & newsletter tools aimed at the same audience. The practical difference is emphasis: ConvertKit is the email-first operating system for creators, now Kit, whereas Customer.io is automated messaging across email, push, SMS and in-app. That shapes which workflows each one feels best for.
Is ConvertKit or Customer.io cheaper?+
Their pricing models are broadly similar (ConvertKit is freemium, Customer.io is freemium), so cost isn't the deciding factor for most people. Check each site for the current plans, since they change regularly.
Can I use ConvertKit and Customer.io together?+
Often, yes. Plenty of people use more than one email & newsletter tool side by side — one as their main driver and another for the things it does best. There's no rule that says you must pick only one, though most settle on a primary tool over time.
Is there a free version of ConvertKit or Customer.io?+
Both generally offer a free or freemium way in, so you can try ConvertKit and Customer.io before paying for either.
The bottom line
The bottom line: ConvertKit is the easier one to recommend as a default, but there's no wrong answer between ConvertKit and Customer.io — they're both genuinely good email & newsletter tools. Re-read the "how to choose" points above, take whichever one speaks to you for a quick spin, and keep the one that earns a permanent place in your workflow.