Invariant.dev
Enforce business rules and event SLAs in real-time
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Invariant Dev

Invariant.dev - Enforce business rules and event SLAs in real-time

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Invariant.dev is a real-time event & business rule monitor. Traditional tools catch 500 errors, but miss silent failures in async pipelines. If an order is placed but never shipped, Invariant alerts you instantly. Define SLA windows between events, stream events via a simple REST API, and get notified on Slack or Webhooks the millisecond your business flow gets stuck. Designed for developers.

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Invariant Dev
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Hi everyone, We built Invariant.dev to solve a specific problem we kept running into: silent failures in asynchronous event pipelines. If you work with event-driven architectures or background queues, you probably know the pain. Traditional monitoring tools are great at catching crashes and 500 errors, but they are completely blind when a step in a business flow simply *never* happens—like a user who signs up but never gets their onboarding email, or an order that gets stuck before shipping. To solve this, we wanted a simple way to track time windows between events without writing complex state tracking logic or custom cron jobs. With Invariant, you can: 1. **Define rules** between events (e.g., `ORDER_CREATED` must be followed by `ORDER_SHIPPED` within 2 hours). 2. **Stream event states** via a simple REST API or cURL. 3. **Receive alerts** on Slack or via Webhooks the millisecond a window is breached. We have a free tier that covers small workloads (up to 10 rules and 100k events/month), and a Pro plan for $5/month if you need to scale. We'd love to know how you currently monitor these kinds of silent failures, and we are open to any feedback or questions you have. Thanks for reading!