Evsy

Event schemas for product analytics teams

Define, document, and maintain analytics events before they silently break your metrics.

View Demo GitHub

[Screenshot of an event schema card in Evsy, showing its properties and metadata.]

Analytics events tend to break quietly.

Ad-hoc Event Creation

Events are added inconsistently without clear structure, leading to chaos.

Silent Property Changes

Properties change without notice, breaking dashboards and downstream models.

Stale Documentation

Documentation quickly drifts from reality, making it untrustworthy and misleading.

Delayed Discovery

Analysts only discover data quality issues long after a feature has been released.

Eroding Trust

As inconsistencies pile up, the entire team slowly loses trust in the metrics.

Analytics events are not just logs.

They are contracts between product, engineering, and analytics.

Clear Structure

Shared Ownership

Explicit Intent

Machine-Readable

A central registry for your event schemas.

Evsy helps teams treat events as first-class entities, not afterthoughts.

Define Schemas

Explicitly define events and their properties.

Reuse Fields

Use shared fields instead of redefining them.

Assign Ownership

Assign ownership and intent to every event.

Organize & Tag

Organize events using a tagging system.

Export Schemas

Generate schemas for downstream systems.

Discover Events

Discover events in a central registry.

Is Evsy right for your team?

Evsy is useful if you are:

a product analyst working with event data
a data engineer maintaining analytics pipelines
a product manager responsible for measurement
a team running experiments at scale

Evsy is probably not for you if:

your product has only a handful of events
analytics is informal or ad-hoc
schema consistency does not matter (yet)

Integrations & Exports

Evsy is designed to fit into real analytics workflows, making event definitions usable by humans and machines.

Open Source

The entire codebase is available on GitHub for transparency and community contributions.

Self-Hosted

Deploy Evsy on your own infrastructure to maintain full control over your data.

No Vendor Lock-in

Export your data at any time. You own your schemas, not a vendor.

Evsy is an open-source project focused on improving analytics reliability through better event design.

Licensed under Apache 2.0.

GitHub Contributing Demo

event: landing_page_view

tags: [landing, views]

fields:

user_id: ""

event_date: ""