Tell, rewritten in Rust. Ingest product events, structured logs, and business data from multiple sources. Route to multiple storage formats. Sub-millisecond end-to-end.

Sources

Three ingestion paths:

TCP — high-throughput binary ingestion for SDKs and collectors, with API key authentication
HTTP — JSON ingestion for web and mobile, with API key authentication
Syslog — TCP and UDP receivers for infrastructure logs, assigned to a workspace per port

Storage

Six destinations, each optimized for its use case:

ClickHouse — real-time analytics queries over events, sessions, and logs
Arrow IPC — fast columnar format for hot data and local exploration
Parquet — compressed columnar archive with Snappy, Zstd, or LZ4 compression
Disk — binary and plaintext formats with log-level separation and optional compression
Stdout — structured output for debugging and development
Null — discard sink for benchmarking ingestion throughput

Route the same data to multiple destinations at once — analytics to ClickHouse, archive to Parquet, plaintext logs to disk.

Live tail

Stream data through your terminal in real time with tell tail. Filter by source, type, or content to watch exactly what's flowing through your system.

Also in this update

DAU, MAU, and retention queries out of the box
18 AI tools for analytics via MCP
API key auth and role-based access — Viewer, Editor, Admin, Platform
Workspace isolation — each workspace in its own database