Turn user intent into revenue—automatically.

Detect when a user is about to convert, drop, or expand—then trigger the right action, instantly.

Recover failed payments. Convert more trials. Expand high-intent users.

Start your first workflow See it in action

Free to start · No credit card · 5-minute setup

One API call. Workflows start running.

You send signals. We decide and act.

1234567891011import { fourbyfour } from "@fourbyfour/sdk"; await fourbyfour.startWorkflow({  userId: "user_123",  intent: "PAYMENT_FAILED",  signals: {    plan: "pro",    mrr: 49,    attempts: 2,  },});

TypeScript

Ln 11UTF-8

Workflow running

That's it.

No dashboards. No manual flows. Just outcomes.

When to act
What action to take
Which channel to use
What performs best

A decision engine between your product and your users.

Simple workflow. Compounding results.

01
You send an intent
Trial started. Payment failed. Usage dropped.
02
We evaluate signals
Behavior, value, timing, history.
03
We decide the next best action
Email, in-app, offer, retry, delay.
04
We execute and learn
Outcomes improve over time.

Built-in workflows for the moments that move revenue.

Drop in the SDK. The workflows are already there.

Recover failed payments

Adaptive retries based on user value and failure patterns.

Escalates only when needed. Reduces unnecessary churn.

Convert trial users

Triggers nudges based on real usage—not arbitrary timelines.

Avoids spam. Improves conversion timing.

Expand high-intent users

Detects upgrade signals early.

Surfaces the right offer at the right moment.

Prevent churn

Identifies drop-off patterns.

Intervenes before users disengage.

Start any workflow with one call

Not rules. Not campaigns. Decisions.

One serves an audience. The other serves a person.

Most tools

Static rules.

Same flow. Every user. Forever.

on signup       → send welcome
on day_3        → send nudge_3d
on day_7        → send nudge_7d
on cancel       → send winback

require manual workflows
treat every user the same
rely on guesswork

Fourbyfour

Live decisions.

Different action. Every user. Always.

Sarah·7 sessions · viewed pricing

upgrade nudge

Marcus·1 session · idle 2d

reactivation email

Priya·payment failed · high LTV

smart retry · save card

adapts per user
updates continuously
improves outcomes automatically

You stay in control.

Define the what. We handle the how.

You define

Your business logic

intents— What triggers a workflow
signals— Data that informs decisions
workflows— Actions to take

We handle

Decisioning & execution

decisioning— Which action to take
timing— When to act
execution— Running the workflow
optimization— Improving over time

If every user should get the same flow, you don't need Fourbyfour.

But if timing, behavior, and intent matter—you do.

See revenue decisions in action—before you integrate.

Simulate a user, watch the workflow adapt, see what would happen in production.

PAYMENT_FAILED

Payment Recovery

Recover failed payments.

SUBSCRIPTION_CANCELLED

Win-back Campaign

Re-engage cancelled subscribers.

SUBSCRIPTION_DOWNGRADED

Downgrade Follow-up

Follow up with users who downgraded.

SUBSCRIPTION_ENDING

Renewal Reminder

Remind users before subscription ends.

Try the playground

Built for product teams that ship fast.

Developer experience that doesn't get in the way.

SDK-first
Event-driven
Type-safe signals
Idempotent workflows
Works with your stack

Start your first revenue workflow.

One integration. Immediate impact.

Get started