10 Best Website & App Audit Tools in 2026 (Free & Paid)

Every one of these tools will tell you your LCP is slow. What actually differs is how much of the rest of the picture you get with it, how fast the feedback loop is, and whether you get a fix or just a finding. Here's an honest comparison of ten tools worth knowing, starting with our own.

What to Look For in an Audit Tool

Before the list, three things that actually separate these tools in daily use:

• Scope - performance-only, SEO-only, or a combined view. Running three separate tools to get one picture of a page is where audits quietly stop happening.
• Turnaround - a 30-second scan gets run before every deploy. A 10-minute crawl gets run once a quarter, if that.
• Actionability - a score with no explanation tells you something's wrong. A score with a specific fix tells you what to do about it.

The List

1. Scanverra

Full disclosure: this is the tool we build, so weigh that accordingly - but here's why it leads this list instead of just appearing on it. Every other tool below covers one slice: performance, or SEO, or a crawl, or monitoring. Scanverra runs performance, SEO, accessibility, and best-practices in a single ~30-second scan, and pairs the score with AI-written fix suggestions tailored to your actual stack, not generic advice. It also ships as one platform with a security scanner, a real-browser crawler for broken links and JS errors, and a GitHub/Bitbucket code scanner - so you're not stitching together four subscriptions to get the full picture. Free to start, no card required.

Best for: teams who want one fast scan instead of four separate tools for four separate concerns.

2. Google PageSpeed Insights (Lighthouse)

The reference implementation. PageSpeed Insights runs Lighthouse under the hood and blends it with real Chrome UX Report (CrUX) field data, so you get both a lab score and how the page actually performs for real visitors. Free, no account needed, and it's the tool most other tools benchmark themselves against.

Best for: a fast, authoritative gut-check on Core Web Vitals - not much beyond that.

3. WebPageTest

The deepest free option for understanding why a page is slow, not just that it is. Waterfall charts, filmstrip playback, multiple real device/location combinations, and connection throttling that actually resembles a real 4G connection. The tradeoff is a steeper learning curve than a single-number score.

Best for: engineers debugging a specific performance regression.

4. GTmetrix

A friendlier layer on top of Lighthouse-style testing, with historical tracking so you can see a score trend over time instead of a single snapshot. The free tier is solid; paid plans add scheduled monitoring and alerting.

Best for: tracking performance drift over weeks, not just a one-off check.

5. Screaming Frog SEO Spider

A desktop crawler that has been the default technical-SEO tool for over a decade. It walks your whole site, not just one URL, flagging broken links, duplicate titles, missing meta tags, and redirect chains at scale. Free up to 500 URLs; paid removes the cap and adds JS rendering and integrations.

Best for: a full technical SEO crawl of a large, established site.

6. Sitebulb

Similar territory to Screaming Frog, but leads with visualizations - site architecture diagrams, internal link graphs - over raw spreadsheets. Desktop app, paid only, aimed more at agencies producing client-facing audit reports.

Best for: agencies who need to present crawl findings to a non-technical client.

7. Ahrefs Site Audit

The auditing module inside Ahrefs' broader SEO platform. Strong at tying technical issues to their actual SEO impact, since it sits next to the same tool's backlink and keyword data. Only makes sense if you're already paying for Ahrefs for other reasons.

Best for: teams already running Ahrefs for keyword research and backlinks.

8. SEMrush Site Audit

The direct SEMrush equivalent to Ahrefs Site Audit - same logic, different ecosystem. Slightly broader default issue coverage out of the box, at the cost of the same "pay for the whole suite" requirement.

Best for: teams already standardized on SEMrush.

9. DebugBear

A monitoring-first tool built specifically around Core Web Vitals trends over time, with alerting when a deploy regresses a metric. Less of a one-off audit tool, more of a "watch this continuously" tool - which is exactly the gap most one-off scanners leave open.

Best for: catching a performance regression the day it ships, not the day someone notices.

10. Pingdom Website Speed Test

Pingdom's free speed test is a quick, no-signup way to get a load-time snapshot from a chosen test location. It's part of a larger uptime-and-performance-monitoring product, so the free test doubles as a funnel into that.

Best for: a quick one-off check when you don't want to sign up for anything.

Which One Should You Actually Use?

If you want performance, SEO, accessibility, security, and code quality checked in one place without maintaining four separate logins, that's the gap we built Scanverra to fill - start there. For narrower jobs, the rest of this list still earns its place: PageSpeed Insights for a free Core Web Vitals gut-check, WebPageTest when you're debugging a specific regression, and Screaming Frog or Sitebulb when you're running a large technical SEO crawl.