Userlist vs Customer.io: B2B SaaS Pricing and Fit (2026)

Prices checked 7 October 2026; each price links to the vendor page it came from. Both vendors use sliders, so the numbers below are what each page displayed at a given stop.

These two tools sit close together in search results because both describe SaaS lifecycle email, but they are billed on different things and they model a customer differently. Userlist bills on the number of tracked users and gives every plan a monthly message allowance; Customer.io bills on profiles, and its pricing page says those profiles are "people + objects", which matters the moment you represent each customer company as an object.

That detail drives most of the comparison. A B2B SaaS team with 4,000 people spread across 600 companies has to ask how many profiles each vendor will count, which channels it actually needs, and who will own the data model afterwards.

What each one costs at 10,000, 20,000 and 30,000 users

Userlist's page shows a slider that starts at "up to 10,000 users" and a note that each plan includes a message allowance of five times your tracked users with a floor of 500,000 messages, per its billing documentation. Customer.io's Essentials plan lists 1 million emails a month. Below those thresholds neither plan charges per message, so the comparison reduces to people counted.

Customer.io stays cheaper at every size we priced, but the gap is widest at the bottom. At 5,000 profiles it reads $100 against Userlist's $149; at 10,000 it is $145 against $149, at 20,000 it is $235 against $249 (Userlist's $149 plus 10 x $10), and at 30,000 it is $325 against $349 on the same arithmetic, a gap of $24. If you want the Professional tier, which Userlist's page lists as adding A/B split testing, conversion goals and advanced workflow features, the 10,000-user price is $349 with $12 for each extra 1,000. Customer.io's next step up is Premium, which starts at $1,000 a month billed yearly.

Two caveats change the arithmetic. First, Customer.io counts objects as profiles, so a product with 20,000 people and 3,000 company objects is billed nearer the 23,000 mark than the 20,000 one. Second, Customer.io's billing documentation says a profile that exists at any point in the billing month counts for that month even if you delete it, so a bulk clean-up lowers next month's bill, not this one. Userlist's page calls its unit "users" and does not say anything about companies being counted separately; ask them before signing if your company count is large.

Customer.io's pricing comparison also marks managed deliverability as not included on Essentials. Userlist's page does not mention it either way, which is a reason to ask both about dedicated sending infrastructure once you pass a few hundred thousand messages a month.

Modelling a company: where the two really differ

Userlist's pitch is that a company is a first-class thing. Its Basic plan description says it "now includes company accounts", and the feature list adds segments for users and companies. In practice that means the question "which companies have an admin who has not finished setup" can be a segment, and an email can go to the admin rather than to everyone who signed up from that domain.

Customer.io gets there through objects. You create an object type such as "company" or "workspace", attach people to it, and build audiences and workflows from the relationships. Essentials allows 2 object types and Premium allows 10, so a product with accounts, workspaces and projects can run out of types on the cheaper plan. The flexibility is real, but nothing decides for you which person in the account is the right recipient; you encode that rule yourself, and you test what happens when the admin changes.

One practical test settles most arguments. Write down the three account-level messages you will send in the first quarter, for example "no teammate invited after 5 days", "admin has not connected the integration", "seat count dropped by half". If all three read naturally as company segments, Userlist matches the work. If they depend on a long tail of behaviour events across several channels, Customer.io earns its extra setup.

Channels and event depth

Customer.io's pricing page lists email, push, in-app, SMS and WhatsApp, a visual workflow builder, an AI Agent, an MCP server and, on Premium, HIPAA compliance. Its pricing table states US and EU data centers on every plan and a published DPA, which is the kind of detail a security questionnaire asks for. That breadth matters if your product has a mobile app or if support wants SMS for urgent account notices.

Userlist's plans describe marketing and lifecycle email, in-app messages, broadcasts, visual workflows and transactional email, plus a 60-minute roadmapping session for new accounts on Basic and group training on Professional. If you will never message by SMS or push, the narrower channel list costs nothing; if a mobile or SMS requirement shows up later, you would be adding a second tool at that point.

Moving between them

Userlist to Customer.io starts with the people-to-company links. Export users with their role, company and signup date, plus the companies themselves, then decide which Customer.io object type represents the company. Re-create each Userlist workflow as a Customer.io campaign, and send the events that used to trigger it (invited a teammate, finished setup) from your application. Carry the unsubscribed list across before the first send, and keep Userlist active until the new tool has delivered a full cycle of the flows that matter, such as onboarding.

Customer.io to Userlist is mostly a simplification exercise. List the workflows that depend on SMS, push or WhatsApp, because those have no equivalent on Userlist's page and need a different home. For the email and in-app workflows, map each object to a Userlist company and check that role information is present for every person, since role-targeted messages are the reason to move. Remember that Customer.io bills any profile that existed during the month, so the old plan still charges for the month you cut over.

In either direction, export suppression and consent records first, and send a handful of internal test accounts through each flow in both tools while the old one is still live.

Verdict

For a B2B product that sells to teams and has an email-first lifecycle, Userlist is the more direct fit: the company model comes with the plan, the price is flat up to 10,000 users, and a non-engineer can run it. Customer.io is the pick when you need more channels, a cheaper entry point under 10,000 people, or the Startup Program; plan for the object model to be your team's job.

Related reading: Userlist vs Loops covers the cheaper email-first alternative, Customer.io vs Braze covers the step up in scale, and Encharge vs Customer.io covers the visual-builder option. If you are leaving one of them, see the Userlist alternatives guide, and for audience-specific picks see email platforms for B2B SaaS.