Know when issues happen in your application

Capture and track and errors in every instance of your application, what led up to each error, and application metrics. Start logging or ingest existing logging with Loupe. Get custom alerts by email or in Slack.

Get information to fix issues when seconds matter

  • Provide better customer support by seeing and tracking errors for individual users.

  • See detailed stack trace, events, and metrics leading up to an error.

  • Graph metrics to pinpoint performance problems.

  • Eliminate noise by clearing old or known errors.

Keep your workflow

Loupe integrates with your existing stack so you can get all the benefits without extra work.

  • Log4Net
  • Nlog
  • Slack
  • HipChat
  • FreshDesk
  • JIRA
  • Email


Data is encrypted in transit. Optional anonymous mode protects PII. Available Active Directory integration to control access and permissions. Self-hosted option is available.

Learn more

Easy Setup

Just add the Loupe Agent and a few lines of code to your application, and Loupe will start logging and capturing errors.

Learn more


Loupe will never crash or hang your application. The Loupe Agent is a lightweight .NET assembly that runs in-process safely and efficiently without impacting performance.

Learn more

Loupe Technical FAQ

What makes Loupe different from other tools?

Loupe combines logging with error reporting. This unique combination of centralized log management with automated error analysis saves you time pinpointing the root cause of bugs and bottlenecks.

Loupe is also extremely efficient and reliable in production. All Loupe data is buffered first to memory then to local disk so it is super fast and nothing is lost even if the network goes down.

Finally, the Loupe logging libraries and log viewer are free. Even if you never purchase a Loupe subscription, you can view your logs locally.

Can I try Loupe before I buy it?

Yes! We encourage you to give Loupe a try. It’s completely free for 30 days, no credit card required. And, even if you never purchase a Loupe Subscription or Loupe Server license, you can continue to use our logging libraries and log viewer for free, forever.

Is it difficult to integrate Loupe with my software?

Not at all. The simple setup captures unhandled errors as well as any existing logging you're already doing and it takes just a couple minutes.

Learn more

How safe is Loupe? Will it slow down my application, use a lot of memory or disk?

Loupe was designed to do no harm from day one. It's safe and efficient in highly multithreaded or single threaded applications and does the vast majority of its work on background threads so as to cause negligible latency to your applications. It makes efficient use of memory and writes data to compressed files to mimimize disk consumption. Moreover, Loupe manages local storage consumption within configurable storage limits and can automate transmission of logs by email or web service calls. Log transmission is restartable, transactional and tolerant of intermittent network connectivity.

What type of applications does Loupe work with?

Loupe is well suited to web applications, desktop applications and services.

Loupe supports all .NET applications built on .NET 2.0 or later and tightly integrates with ASP.NET, MVC, WebAPI, Entity Framework and the .NET Framework for a wealth of automatic logging. Loupe also supports JavaScript and Angular clients.

Loupe captures all the logging you're already doing via System.Diagnostics, Console, log4net, Nlog, and it also integrates easily with your homegrown logging system.

What are the key parts of Loupe?

Loupe consists of three parts:

  • Loupe Agent is a lightweight .NET assembly that runs in-process within your applications safely and efficiently collecting errors, events, metrics and configuration information.
  • Loupe Desktop is a desktop application used to manage and analyze Loupe logs.
  • Loupe Server is a powerful web application brings your data and your team together.

Rock solid centralized .NET logging

Unlimited applications, unlimited errors, starting at $25/month