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What is PerfDelta?

PerfDelta serves as a specialized online platform aimed at assessing and monitoring website speed, specifically tailored for SEO experts, digital agencies, and internal web development teams. The free testing feature permits users to analyze up to three web pages on both mobile and desktop devices, utilizing real-user Core Web Vitals data derived from the Chrome UX Report in combination with metrics from Lighthouse labs. Its in-depth reports facilitate direct comparisons between a user’s website and up to two competitors, as well as benchmarks against previously analyzed sites, while also illustrating page weight distributions, timelines for requests, identifying the technologies employed, and offering prioritized recommendations that highlight estimated savings along with the relevant affected files. Those who choose to subscribe to paid plans gain access to extra features including scheduled monitoring, performance budgets, email alerts, historical reporting, and PDF exports, with Agency and Scale plans also providing CSV export capabilities, public dashboards, and a REST API for more advanced functionalities. Additionally, the platform's MCP access empowers compatible AI agents to effortlessly request tests and retrieve results. Clients can also share reports for performance evaluations and to aid in continuous website improvements, significantly enhancing the overall value of the service provided. This comprehensive offering makes PerfDelta an indispensable tool for those committed to optimizing their web performance.

What is Calibre?

Discover an all-encompassing speed monitoring solution that provides detailed reports alongside actionable insights aimed at optimizing your website's performance. With this tool, you can delve into user experience analytics while enjoying the option to choose from global testing locations, mute ads, or conveniently simulate interactions on mobile devices. Proactively address potential speed regressions that could adversely affect your revenue, ensuring that you consistently meet your performance targets. Evaluate the impact of external scripts swiftly, allowing you to make informed decisions regarding the tools you employ, all without sacrificing speed. Spot any speed variations before launching production releases, thereby instilling a sense of responsibility within your development team. Effortlessly design tests and obtain vital metrics, with options for data export and seamless integration with your favorite tools. By streamlining the process of analyzing speed data, you will save significant time while receiving attractive reports on crucial metrics weekly or monthly. Rely on the precision of your speed metrics, as Calibre employs an AI-powered validation engine to provide the most reliable performance results on the market. Our mission is to equip and inform businesses, enabling them to develop fast and accessible products that effectively cater to their users. By placing an emphasis on speed and user-friendliness, you not only improve user satisfaction but also enhance engagement with your offerings, ultimately driving business success. This comprehensive approach to performance monitoring can be a game-changer for your online presence.

Media

Media

Integrations Supported

ChatGPT
Claude
Cursor
Google PageSpeed Insights
Lighthouse
Model Context Protocol (MCP)
Zapier

Integrations Supported

Netlify
Slack
Stackreaction
Vercel

API Availability

Has API

API Availability

Has API

Pricing Information

€23/month
A free plan is available. The Solo plan costs €23/month net with monthly billing, or €230/year net with annual billing. Higher plans add scheduled monitoring, alerts, report history, exports, and API access.
Free Version

Pricing Information

$60 per month
Free Trial Offered?

Supported Platforms

SaaS

Supported Platforms

SaaS

Customer Service / Support

Web-Based Support

Customer Service / Support

Standard Support
Web-Based Support

Training Options

Documentation Hub

Training Options

Documentation Hub
Online Training

Company Facts

Organization Name

PerfDelta

Date Founded

2026

Company Location

Berlin, Germany

Company Website

perfdelta.com

Company Facts

Organization Name

Calibre Analytics

Company Location

Australia

Company Website

calibreapp.com

Categories and Features

Speed Test

PageSpeed Insights evaluates a single URL and provides a singular score. In contrast, PerfDelta examines three pages in each session, displaying results alongside up to two competing sites as well as a reference point based on all domains assessed to date. Additionally, it maintains a record of every measurement taken. The free testing option does not require an account.

Not specified

Website Monitoring

Monitor your Core Web Vitals alongside competitor comparisons and receive timely alerts. Our subscription plans allow for the tracking of 25 to 500 URLs either daily or weekly, with updates every 6 hours for agency accounts. You'll receive daily CrUX field data, the ability to track 3 to 10 rival websites, set performance budgets for individual projects and URLs, and get notified via email if a score decreases by 10 points or more. Additionally, a detailed report will be provided weekly.

Event-Based Notifications
Performance Metrics

Categories and Features

Website Monitoring

Not specified

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