Ownership. Privacy. Control.
Helion is the open-source event analytics engine built for developers who actually own their infrastructure and demand zero data limits.
What is Helion?
Helion is an open-source product and web analytics platform. It tracks custom events, user behavior flows, conversion funnels, retention trends, and web traffic — without third-party tracking cookies, without leaking your visitor data to external vendors, and without incurring scaling SaaS subscriptions.
It stands as a high-performance, developer-first alternative to tools like Mixpanel, PostHog, and Google Analytics. It is designed from the ground up for engineering teams who require deep analytical depth without vendor lock-in.
Why Helion Exists
The Data Ownership Moat
Most modern analytics platforms store your raw telemetry data on infrastructure you do not control. If you cancel your subscription, your historical insights are wiped. If regulators audit your GDPR compliance, you are dependent on the security guarantees of a vendor's data processing pipelines.
Self-hosting solves this. Every tracked user event lands in your own ClickHouse database instance. You own the exports. You write the queries. You control the retention period — permanently, on your own terms.
Built for the AI Era
User behavior telemetry is no longer just for generating graphs on a manager's dashboard; it is a critical training signal. Next-generation teams are using telemetry to fine-tune user models, trigger recommendation pipelines, and drive autonomous agent workflows.
Helion was built for this shift. By storing events directly in ClickHouse, your data is queryable natively. Furthermore, with our Model Context Protocol (MCP) server integration, your LLM agents can query and analyze user conversion trends dynamically without intermediary middleware.
Interactive System Architecture
Tap any layer to explore how events travel from device to database.
Lightweight ~2.3 KB tracking SDK that logs events directly to your endpoint with zero storage cookies, avoiding privacy banners completely.
High-Performance Database Foundation
Analytics queries — like computing funnel drops across millions of actions — require scanning massive amounts of data. Using a standard transactional database (like PostgreSQL) for analytics leads to high query latencies and CPU bottlenecks.
Helion utilizes ClickHouse, the world's fastest open-source columnar database management system. It writes incoming events in optimized batches and executes complex aggregation queries in milliseconds.
ClickHouse Analytics Engine Simulator
See how column-store databases execute aggregate queries across millions of rows in milliseconds.
SELECT
event_name,
count(DISTINCT user_id) as users,
users / first_value(users)
OVER () * 100 as pct
FROM events
WHERE timestamp > now() - INTERVAL 30 DAY
GROUP BY event_name
ORDER BY users DESC;Fully Open Source & Free to Self-Host
Helion is licensed under AGPL-3.0 and is fully open-source. There is no closed enterprise tier hiding core features behind paywalls. The system you self-host is exactly what we build.
- Web analytics: Track pageviews, unique visitors, referrers, and UTM campaigns with zero cookies.
- Product analytics: Log custom events, track cohorts, configure retention grids, and inspect detailed user session profiles.
- Developer integrations: Out-of-the-box SDK support for JavaScript, React, Next.js, Astro, Python, and more.
Independent & Bootstrapped
Helion Labs is an independent, developer-first project, not a venture-backed startup. The project is created and actively maintained by Lalit Shrotriya.
We are committed to building highly robust, privacy-hardened tools that return data control to the developers who build the web.
Questions, feedback, or contribution ideas? Contact us at hello@helionlabs.dev or join our Discord Community.