Structured Logs for .NET Apps

Improve visibility into .NET apps

Seq is the easiest way for .NET developers to capture, search and integrate structured log events. Compared with traditional plain-text logs, structured logs cut through the complexity of distributed and asynchronous applications.

By increasing visibility into running apps from development through to production, Seq helps your team identify and resolve issues fast.

Seq has already solved several visibility problems — Arri Rucker, City Corridor

Query with familiar syntax

When you log structured data, Seq lets you "reach inside" events with a C#-inspired query syntax for ultimate filtering and correlation. If an event includes numeric data, query with all the comparisons you'd expect: <, <=, == and so-on.

Seq has text-searching capabilities including regular expression support, so you don't give up any flexibility by logging structured events.

Search by Property

Integrate and react

Take advantage of community-published apps to process events, or write your own.

Apps can be triggered to send email or instant messages, post to issue trackers, or relay data to existing BI infrastructure.

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Install in seconds

Seq is a self-hosted web application you can install on-premises or in the cloud. Authentication, API keys and full support for SSL at the logging endpoint keep your data safe.

Log structured events

Seq integrates deeply with the Serilog library to preserve the structure of log event data for revolutionary filtering and correlation.

To get started install the Seq.Client.Serilog package from Visual Studio's NuGet console:

PM> Install-Package Seq.Client.Serilog

Point a logger to Seq:

var log = new LoggerConfiguration() .WriteTo.Seq("http://localhost:5341") .CreateLogger();

And use the Serilog message template DSL to associate named properties with log events:

log.Information("Customer {CustomerId} logged on", customerId);

Not using Serilog? We think you should give it a try, but Seq also has support for other popular .NET logging frameworks including SLAB, log4net and NLog. You can find instructions on our wiki.

Get started now

Seq is provided with a free single user license - just download the installer and go!

Try Seq's professional features including authenticated access and SSL free for 30 days. When you're ready, choose a paid license to suit your team.