Your users,
in code.
Send identify and track. Get profiles, live segments, and journeys you write in TypeScript.
Start with a whole program, not a snippet.
One command writes six journeys, their emails and their segments into your repo, as code you own and edit from the first minute.
abandoned-checkout
Reminds someone who left items in their cart, twice at most.
first-order-thanks
Thanks a first-time customer, then asks how the order went once it arrives.
Four steps from a signup to a welcome email.
Send events
Two calls, identify and track, from anywhere you can make an HTTP request.
Get the profile back
Cowliss makes the id, links the two identities, and updates the segments.
Write the follow-up
TypeScript in your repo. Test it, then ship it.
Watch it land
Mail goes out from your own domain, and every send is on the log.
Everything a big company's growth team has, without the growth team.
Segments are never stale
The list updates the second an event lands, and you can preview one before you save it.
Roll back a bad send
Every push is a numbered version, and one command points back at the last good one.
Your code cannot leak
It runs in a sandbox with no network and no secrets, and every email it sends is logged.
Typos show up at once
List your events in cow.json, and any name you did not list is flagged on its app.
Try a journey before it sends
Run it against a real person and read every mail it would send, delivering none.
Import the past, quietly
Import a year of events without sending a year of welcome emails.
Run more than one product
Each app keeps its own data, and any segment or journey can be scoped to one.
Answer a GDPR request in a click
Consent, export, and deletion are one call each, from anywhere.
Keep your own BI tool
A read-only ClickHouse user for the BI tool you already have.
Your welcome email is a file in your repo.
You write it in TypeScript, review it in a pull request, and ship it like any other code. There is no canvas to drag boxes around on.
Test a two-day journey in a second. The clock is fake, so nothing waits and nothing sends.
Nothing ships by accident. A push changes no flag; you turn a journey on when you mean it.
Shipping is safe mid-flight. Someone waiting on day two finishes on the code they started on.
You can leave. The code is yours, in your repo, not locked in our database.
import { defineJourney } from '@cowliss/cli/journeys'; export default defineJourney({ trigger: { segment: 'new-signups' }, purpose: 'marketing', from: 'Acme <[email protected]>', tags: ['lifecycle'], run: async (event, api) => { await api.send.email({ template: 'welcome' }); await api.sleep('3d'); const me = await api.profile.get(); if (me.traits.plan === 'trial') { await api.send.email({ template: 'tips', from: 'Onboarding <[email protected]>', }); } else { await api.send.webhook({ destination: 'crm', payload: { profileId: me.id }, }); } }, });
$ cow test welcome --scenario scenarios/welcome.json ✓ passed · 4 steps on a virtual clock, nothing sent $ cow push built 2 journeys, 4 templates push #12 stored, compiling 2 journeys. $ cow enable welcome --env production welcome is on in production.
Your agent can do anything you can do here.
Every button in the dashboard is also a CLI command and an MCP tool, built from the same typed definition. Point an agent at it and it has the whole product.
For people
Every user on one page: traits, segments, events, journey runs, every email sent.
For your terminal
Build, test, push, turn journeys on and off, and inspect without leaving your repo.
For your agents
An MCP server with every operation in it. No scraping, no screenshots, no browser.
llms.txt, so an agent can read them before it starts.Start free, pay for what you use.
Every feature on both plans. Nobody is charged for a teammate.
$0
- $0.50 of usage included a month.
- 1 app and 1 sending domain.
- No card required.
$9.99 a month
- $15 of usage included a month.
- Up to 15 apps and 10 sending domains.
- Cancel any time.
Four things are counted
- Events ingested · $2 per 10,000
- Emails sent · $4 per 10,000
- Webhooks delivered · $2 per 10,000
- Journey runs · $2 per 10,000
- Same rates on both plans. Never per seat.
Customer data,
in code.
Free usage included every month. No card to start.