Scalyr is described as 'Log aggregation, search, analysis, dashboards & alerts all in one tool. Diagnose server issues faster and on one screen' and is a web log analyzer in the network & admin category. There are more than 25 alternatives to Scalyr for a variety of platforms, including Linux, Online / Web-based, Mac, Windows and Self-Hosted solutions. The best alternative is Grafana, which is both free and Open Source. Other great apps like Scalyr are Prometheus, Kibana, Datadog and Logstash.
Prometheus is an open-source systems monitoring and alerting toolkit originally built at SoundCloud. Since its inception in 2012, many companies and organizations have adopted Prometheus, and the project has a very active developer and user community.
Datadog is a monitoring service for IT, Dev & Ops teams who write and run applications at scale, and want to turn the massive amounts of data produced by their apps, tools and services into a unified view of IT infrastructure. 120+ Integrations!.
Loki is a horizontally-scalable, highly-available, multi-tenant log aggregation system inspired by Prometheus. It is designed to be very cost effective and easy to operate. It does not index the contents of the logs, but rather a set of labels for each log stream.
Splunk is software that provides unique visibility across your entire IT infrastructure from one place in real time. Only Splunk enables you to search, report, monitor and analyze streaming and historical data from any source.