Top 12 Open-Source Alternatives to GTmetrix

GTmetrix

GTmetrix is a free tool that analyzes your page's speed performance. Using PageSpeed and YSlow, GTmetrix generates scores for your pages and offers actionable recommendations on how to fix them.

The top open-source alternatives to GTmetrix are Datadog, Web.dev by Google, and Sitespeed. One of the criteria for ordering this list is the number of mentions that products have on reliable external sources. You can suggest additional sources through the form here.

Datadog Landing Page
1

Datadog

See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Pricing:
- Open Source
- Freemium
- Free Trial
- $15.0 / Monthly (per host)
#Monitoring Tools #Log Management #Error Tracking 5 social mentions
Web.dev by Google Landing Page
2

Web.dev by Google

Learn how to build for the web and see where you stand 🌟
Pricing:
- Open Source
#Online Services #Tool #SEO Tools 125 social mentions
Sitespeed Landing Page
3

Sitespeed

Sitespeed.io is an open source tool that helps to analyze and optimize website speed and performance.
Pricing:
- Open Source
#Monitoring Tools #Log Management #Application Performance Monitoring
Zabbix Landing Page
4

Zabbix

Track, record, alert and visualize performance and availability of IT resources
Pricing:
- Open Source
- Free
#Monitoring Tools #Performance Monitoring #DevOps Tools 5 social mentions
XHProf Landing Page
5

XHProf

XHProf is a function-level hierarchical profiler for PHP and has a simple HTML based user interface.
Pricing:
- Open Source
#Monitoring Tools #Log Management #Performance Monitoring
Loader Landing Page
6

L

Loader

Load testing and tracking application
Pricing:
- Open Source
#Monitoring Tools #Application Performance Monitoring #Log Management
Nagios Landing Page
7

Nagios

Complete monitoring and alerting for servers, switches, applications, and services
Pricing:
- Open Source
#Monitoring Tools #Performance Monitoring #Log Management
Graylog Landing Page
8

Graylog

Graylog is an open source log management platform for collecting, indexing, and analyzing both structured and unstructured data.
Pricing:
- Open Source
#Monitoring Tools #Log Management #Performance Monitoring 2 social mentions
Instrumental Landing Page
9

Instrumental

Real-Time Application & Performance Monitoring
Pricing:
- Open Source
#Performance Monitoring #Monitoring Tools #Log Management 1 social mentions
Prometheus Landing Page
10

Prometheus

An open-source systems monitoring and alerting toolkit.
Pricing:
- Open Source
#Monitoring Tools #Performance Monitoring #Log Management 225 social mentions
Wireshark Landing Page
11

Wireshark

Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Pricing:
- Open Source
#Monitoring Tools #Log Management #Performance Monitoring 11 social mentions
gatling Landing Page
12

gatling

A high performance web server. Small! (125k static Linux-x86 binary with HTTP, FTP and SMB support).
Pricing:
- Open Source
#Monitoring Tools #Website Testing #Development