Free & Open Source

Local Observability on your machine.

Every OpenTelemetry signal your services emit, captured on your machine in real time. No cloud. No account. No config.

Download for Mac — FreemacOS 14+

Complete Signal Coverage

Every signal.
One place.

Traces

Full distributed trace timelines with sub-millisecond precision. Every span, attribute, and event across services.

Logs

Structured log capture with full-text search and filtering. Jump from any log line directly to its parent trace.

Metrics

Real-time counters, gauges, and histograms. Monitor latency, throughput, and error rates as they happen.

Profiles

Interactive flame graphs from pprof and other standard formats. Find performance bottlenecks without switching tools.

Quick Start

Up and running in minutes.

Download Sequins

Get the free desktop app for macOS. No account or sign-up required.

Set two environment variables

Point your OpenTelemetry SDK to Sequins running on localhost.

Run your app — you're done.

Traces, logs, metrics, and profiles appear immediately. No configuration needed.

.env

# Point your SDK to Sequins
OTEL_EXPORTER_OTLP_ENDPOINT=http://localhost:4318
OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf

# Optional: name your service
OTEL_SERVICE_NAME=my-app

Works with any OpenTelemetry SDK — Go, Python, Node.js, Java, Ruby, Rust, and more.

Architecture

Built for your machine. Not someone else's cloud.

100% local

Complete data privacy

All telemetry stays on your machine. No data leaves your laptop — no vendor access, no cloud storage, ever.

:4317

Standard OTLP endpoint

Built-in gRPC and HTTP collectors on standard ports. No agents, no proxies, no SDK changes. Just point and go.

Native SwiftUI

GPU-accelerated interface

Built with SwiftUI for a fast, native macOS experience. Navigate millions of spans at 60fps without breaking a sweat.