Screaming Frog SEO Spider vs SpeedCurve in 2026: Full-site crawler vs continuous performance monitoring
Screaming Frog finds what is structurally broken across an entire site for a flat £199 a year. SpeedCurve watches Core Web Vitals and business impact over time for a recurring fee starting at $90 a month. Most technical SEO programs eventually need both.
Screaming Frog SEO Spider
SpeedCurve- Screaming Frog crawls an entire site to find structural and content issues. SpeedCurve does not crawl at all; it monitors a defined list of URLs continuously for performance.
- SpeedCurve combines synthetic testing and real user monitoring in one dashboard and tracks LCP, CLS, and INP as trend lines. Screaming Frog has no native Core Web Vitals tracking, only a PageSpeed Insights snapshot pulled through its Google integrations.
- SpeedCurve is the only one of the two with competitive benchmarking, letting you chart your own performance against named competitor URLs using the same test methodology.
- Screaming Frog's paid license is a flat £199 a year with unlimited crawled URLs. SpeedCurve starts at $90 a month and reaches $576 a month for the Growth plan, with Enterprise priced on request.
- Server log analysis, which shows exactly what Googlebot is crawling and how often, is included in Screaming Frog's standard license. SpeedCurve has no log analysis feature.
- SpeedCurve's business impact correlation connects performance metrics to conversion rate, a feature aimed at justifying performance work to non-technical stakeholders. Screaming Frog reports crawl issues but does not tie any of them to revenue.
- Neither tool tracks AI Overviews citations, ChatGPT mentions, or any other AI search visibility signal; both stay scoped to traditional crawl and performance diagnostics.
Screaming Frog SEO Spider and SpeedCurve rarely compete for the same budget line, but they get compared anyway because both sit under the technical SEO umbrella and both touch page speed. Screaming Frog is a desktop crawler: point it at a domain, it follows every link it finds, and it hands back broken pages, redirect chains, duplicate metadata, and (via its own server logs) exactly what Googlebot is doing on the site, all for a one-time £199 annual license. SpeedCurve does not crawl anything. It is a monitoring platform that watches a defined set of URLs continuously, blending synthetic tests with real user monitoring, and its two standout features, competitive benchmarking against named rivals and business impact correlation tying LCP to conversion rate, are things Screaming Frog was never built to do. One tool audits structure at a point in time; the other tracks performance as a trend line.
The tools at a glance
Screaming Frog SEO Spider
The industry-standard desktop crawler for technical SEO audits.
Screaming Frog SEO Spider crawls a site the way a search engine bot does, following links and cataloguing every status code, title tag, canonical, and redirect it encounters. It runs locally on your own machine rather than in the cloud, so the free version stops at 500 URLs while the £199 a year license removes the cap entirely, with Chromium-based JavaScript rendering and custom XPath, CSS, or regex extraction included at no extra cost.
The feature that sets it apart at this price is server log analysis, bundled into the standard license instead of sold separately. Upload your Apache, Nginx, or IIS logs and the Spider maps which URLs Googlebot is actually visiting against your site structure, which answers a different and often more useful question than what a crawl alone can tell you.
What it does not do is track anything over time. Each crawl is a snapshot; there is no dashboard that shows whether LCP improved this month versus last, and its only window into Core Web Vitals is a PageSpeed Insights score pulled through the Google integrations. For structural, point-in-time auditing across a whole site it has few real peers at the price; for continuous performance tracking, it was never designed for the job.
| Feature | Free Free (limited to 500 URLs) | Single License £199/year | 5-9 Licenses £189 per license/year | 10-19 Licenses £179 per license/year | 20+ Licenses £169 per license/year |
|---|---|---|---|---|---|
| URL limit | 500 | Unlimited | Unlimited | Unlimited | Unlimited |
| Server log analysis | No | Yes | Yes | Yes | Yes |
| Google integrations | No | Yes | Yes | Yes | Yes |
| JavaScript rendering | No | Yes | Yes | Yes | Yes |
| Custom extraction | No | Yes | Yes | Yes | Yes |
SpeedCurve
Web performance monitoring platform that tracks site speed through synthetic testing and real user monitoring, with competitive benchmarking and business impact correlation.
SpeedCurve was built by Steve Souders and Mark Zeman, two names closely associated with web performance engineering, and it shows in the product's focus. Rather than a one-off test, SpeedCurve runs scheduled synthetic checks from global locations and pairs them with real user monitoring data, presenting both on the same timeline so you can see whether a lab improvement actually shows up in what real visitors experience.
Its two most distinctive features are competitive benchmarking, which tracks named competitor URLs on your own charts using identical measurement methodology, and business impact correlation, which connects metrics like LCP to conversion rate. Both are aimed squarely at making a performance case to people who do not read Lighthouse reports for fun.
None of this comes cheap. Pricing starts at $90 a month for Starter, where competitive benchmarking and business impact correlation are either limited or absent, and jumps to $576 a month for Growth to unlock them properly. There is no free tier. For a team without a dedicated performance function, that is a hard number to justify next to a crawler that costs less per year than SpeedCurve costs per month.
| Feature | Starter $90/month | Growth $576/month | Enterprise Contact for pricing |
|---|---|---|---|
| Synthetic monitoring | Yes | Yes | Yes |
| Real user monitoring | Yes | Yes | Yes |
| Competitive benchmarking | Limited | Yes | Yes |
| Business impact correlation | No | Yes | Yes |
| API access | Yes | Yes | Yes |
| CI/CD integration | Yes | Yes | Yes |
Head-to-head feature comparison
| Feature | Screaming Frog SEO Spider | SpeedCurve |
|---|---|---|
| Primary use case | Full-site technical SEO crawl and audit | Continuous web performance monitoring |
| Full-site crawling | Yes | No |
| Server log analysis | Yes, included | No |
| Real user monitoring (RUM) | No | Yes |
| Synthetic testing | No (PageSpeed Insights snapshot only) | Yes |
| Core Web Vitals tracked over time | No | Yes |
| Competitive benchmarking | No | Limited on Starter, full on Growth+ |
| Business impact correlation | No | No on Starter, yes on Growth+ |
| Structured data / hreflang validation | Yes | No |
| Custom data extraction | Yes (XPath, CSS, regex) | No |
| API access | Yes (custom extraction / data pipeline) | Yes |
| CI/CD integration | No | Yes |
| Deployment model | Desktop app (Windows, macOS, Linux) | Cloud SaaS platform |
| Starting price | Free / £199/yr | $90/mo |
Which should you choose?
Screaming Frog SEO SpiderSpeedCurveScreaming Frog SEO SpiderSpeedCurveScreaming Frog SEO SpiderSpeedCurveScreaming Frog SEO SpiderThese two rarely fight for the same purchase decision because they measure different things at different points in a project. Screaming Frog is the tool you run before a migration, during a quarterly audit, or when a client asks why a page is deindexed; it tells you what is broken right now. SpeedCurve is the tool you leave running in the background to catch a slow regression before it costs conversions, and to prove to a stakeholder that the fix actually mattered. A team that only ever needs one of these two jobs done can buy just the one tool; most technical SEO programs of any size end up needing both eventually.
Bottom line
Buy the Screaming Frog license first, full stop, at £199 a year it pays for itself on the first audit and covers the more common day-to-day need: finding what is structurally wrong. Add SpeedCurve once you have a large enough site or client portfolio that performance regressions are a recurring risk worth watching continuously, and once you have a stakeholder who needs conversion-rate proof rather than a raw Core Web Vitals number. Do not buy SpeedCurve as a substitute for a crawl; it will not find a single broken canonical tag.
Frequently asked questions
Can SpeedCurve replace Screaming Frog for a technical SEO audit?
No, SpeedCurve cannot replace Screaming Frog because it has no crawling function at all; it only monitors a list of URLs you already know about. It will not find broken links, duplicate title tags, or redirect chains across a site the way Screaming Frog does, since finding those problems in the first place requires walking every link on the site.
Does Screaming Frog track Core Web Vitals the way SpeedCurve does?
No, Screaming Frog has no native Core Web Vitals tracking and only pulls a PageSpeed Insights snapshot through its Google integrations, which is a single point-in-time score rather than a trend. SpeedCurve tracks LCP, CLS, and INP continuously across both synthetic tests and real user monitoring, which is the more useful view for spotting a regression.
Is SpeedCurve worth the cost for a small agency compared to Screaming Frog?
For most small agencies, SpeedCurve at $90 a month is a hard number to justify against Screaming Frog's £199 a year, especially since competitive benchmarking and business impact correlation, SpeedCurve's two headline features, are limited or unavailable on the entry Starter plan. Screaming Frog covers the more common day-to-day audit need at a fraction of the annual cost.
Which tool is better for proving that a performance fix helped conversions?
SpeedCurve is built for this specifically through its business impact correlation feature, which connects metrics like LCP or page load time to conversion rate on the Growth plan and above. Screaming Frog has no equivalent; it reports crawl and content issues but does not tie any of them to revenue or conversion data.
Does either tool include server log analysis?
Only Screaming Frog includes server log analysis, bundled into its standard £199 a year license with no separate charge. SpeedCurve has no log analysis feature at all; it measures what happens when a browser loads a page, not what Googlebot is doing on your server.
Do Screaming Frog or SpeedCurve track AI Overviews or ChatGPT citations?
No. Neither tool has any AI search visibility feature; Screaming Frog is scoped to crawl-based structural auditing and SpeedCurve to performance monitoring, and neither one tracks AI Overviews inclusion, ChatGPT mentions, or any other LLM citation signal. A dedicated AI visibility tool is a separate purchase if that data matters for your reporting.