Datalust, the company behind Seq

Seq is the intelligent search, analysis, and alerting server built specifically for modern structured log data.

Seq Screenshot

News and announcements

Seq 2021.3 previews now available

Tuesday, 18 May 2021

The first 2021.3 preview builds are now live on and Docker Hub. Along with some other improvements, they include the very first pieces of clustered Seq: disaster recovery (DR) and zero-downtime upgrades through asynchronous replication.

Cluster-aware functionality is behind a feature flag and will ship with

Populate Seq with realistic sample data

Monday, 29 March 2021

Without the log data, searches, and dashboards that show what your application or system is up to, Seq is just a blank frame.

This makes it awkward to try out Seq for the first time, or to demonstrate it to someone else: there's nothing to see until you've already done

Time zone handling and `datepart()` in Seq 2021.2

Tuesday, 23 March 2021

Seq internally stores all event timestamps in UTC.

When you browse logs in the Seq UI, these get converted into your local time zone for display, so an error that happens while you're out enjoying an afternoon cup of coffee in Seattle will show up in search results with a

New from Datalust

On .NET Live - Application logs and diagnostics with Serilog

Nicholas Blumhardt talks application diagnostics with Cecil Phillip in On .NET Live.

.NET Rocks! #1647 - Rust and C# with Ashley Mannix

Ashley Mannix talks with Carl and Richard about the combination of Rust and C# used at Datalust.

C# and Rust: Combining Managed and Unmanaged Code Without Sacrificing Safety, NDC Oslo 2019

Ashley Mannix explores the tools that .NET and Rust give us to design and build safe and robust hybrid applications.

Parsing in C# from First Principles, NDC Sydney 2018

Nicholas Blumhardt talks about Superpower, the library we built for parsing SQL queries in Seq, and the foundational principles behind it.

Open Source and the Future of Seq

Brendan Richards interviews Nicholas Blumhardt about Open Source, Rust, Seq, Serilog, and more, in this AMA from NDC Sydney 2018.

Using Structured Logging for Production Insight

Microsoft's Damian Brady and Nicholas Blumhardt talk structured logging in this episode of The DevOps Lab.

.NET Rocks! #1466 - The Evolution of Serilog

Richard Campbell, Carl Franklin, and Nicholas Blumhardt talk all things logging, diagnostics, and monitoring in this .NET Rocks! episode recorded at NDC Oslo 2017.

Serilog: Instrumentation that Works for You, NDC Oslo 2017

Nicholas Blumhardt presents a complete walk-through of Serilog and modern structured logging at NDC Oslo 2017.