Why Seq?

Seq captures the detailed, domain-specific events you need to debug tough problems. Send logs and traces from any language using HTTP, OpenTelemetry, and flexible custom inputs. Seq preserves all the structured information provided by your applications, and exposes it directly through a high-fidelity JSON data model.

Outages are measured in minutes and seconds, so Seq is real-time. There's no indexing delay to leave you sweating while you wait for the results of a configuration change or deployment to be reflected in your monitoring system.

And perhaps most importantly, Seq is fully self-hosted. Your rich, detailed application logs and traces stay on your infrastructure, on-premises or in the cloud, under your organization's security controls and privacy standards.

Search and filter

Opening Seq is opening a log file with superpowers.

Data is always fresh to the second, everything's in front of you ready to inspect, and subtle navigation helpers make correlation easy without you having to remember every detail of the search syntax.

Free-text searches, expression-based filtering, and regular expression support, mean you can drill down into events quickly and precisely when you need to.

Trace and observe

Get instant visibility into what complex operations are really doing.

Traces complement logs to answer questions such as "Why is this endpoint slow?" and "Which other services does this one call?".

Analyze and chart

Use aggregate queries and time-slicing to find trends and create rich dashboards.

Watch error rates, track latencies, or visualize business performance using structured data from log events and traces.

Alert and integrate

Be in-the-know about problems before your users or customers are affected.

Set alerts based on custom conditions, and sends notifications to a variety of channels including Slack, Teams, and SMTP mail.

Write custom integrations using a simple C# library, or as command-line apps in any programming language.

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