# Screaming Frog vs Semrush Site Audit

Screaming Frog is a crawler you run: it fetches your site from your own machine and hands you tables to interpret. Semrush Site Audit is a crawl that runs for you in the cloud, on a schedule, and explains what it found in priority order. The difference is not accuracy, it is who does the interpreting. This page shows what each is built for, where the crawl limits bite, and which one a founder should install.

Updated 2026-09-15 · Source: https://porteur.ai/compare/screaming-frog-vs-semrush-site-audit

## The short answer

Take Screaming Frog when you want to see everything and decide yourself: it is a desktop crawler for Windows, macOS and Linux, free up to 500 URLs, and the licence removes the limit and adds custom extraction, scheduling and API connections.

Take Semrush Site Audit when you want the crawl to happen without you, to arrive explained and ranked by priority, and to sit beside the keyword and link data you already pay for.

> If you already subscribe to Semrush, its audit is free at the point of use. If you do not, the free tier of a desktop crawler covers a small site's technical work.

## The criteria that decide it

- Who interprets: you reading tables, or a tool ranking issues for you.
- Where it runs: your machine and your network, or a cloud crawler on a schedule.
- How often: when you remember, or every week without you.
- How deep: every response header and custom field you care to extract, or a defined set of checks.
- What else is in the box: a crawler alone, or an audit next to keywords, links and tracking.

## What each is built for

Screaming Frog SEO Spider is a crawler. It fetches URLs, renders them, and lays the result out in tables: status codes, titles, descriptions, headings, canonicals, directives, redirects, images, links in and out. It tells you what is there. It does not tell you what matters, which is both its weakness and the reason experienced people like it.

Semrush Site Audit is one module of a broad suite. It crawls your site from the cloud, checks it against a list of issues, groups them into errors, warnings and notices, and explains each one with what to do. The crawl is metered by your plan, and the findings sit beside the suite's keyword, tracking and backlink data.

> A third option sits between them: Sitebulb is a desktop crawler with a cloud version, known for explained hints with priorities and visual crawl maps. It is the crawler for someone who wants the tables and the explanation.

## Where the desktop crawler wins

- Control: you choose what to crawl, what to exclude, how fast, with which user agent, and whether to render JavaScript.
- Depth: custom extraction pulls any field out of the HTML, so you can list every page missing a schema block or carrying an old tracking script.
- Speed on a small site: a crawl of a few hundred pages finishes while you make coffee, with no queue.
- Staging and protected sites: it can crawl an environment that is not public, because it runs from your machine.
- Your data stays yours: the crawl lives in a file, not in an account.

A worked example: you want every page whose title is longer than sixty characters and which links to /pricing. In a crawler that is two columns and a filter. In a cloud audit it is whatever the issue list decided to check.

## Where the cloud audit wins

- It runs without you, on a schedule, and tells you when something changed.
- Findings arrive explained and ranked, so a founder who has never read a crawl knows what to open first.
- History: the same checks over months, so a regression has a date.
- Shared: a team or a client sees the same report without installing anything.
- Context: the audit sits beside the queries the page ranks for and the links it has, which is where a technical fix becomes a business decision.

The honest version of that last point: an issue list is a starting point, not a plan. A tool that says "212 pages have duplicate meta descriptions" has not told you whether any of them earn a click.

## Side by side

| Question | Screaming Frog | Semrush Site Audit |
| --- | --- | --- |
| Where it runs | Your machine, Windows, macOS or Linux | The cloud |
| Free use | Up to 500 URLs | Inside the suite, metered by plan |
| Interpretation | Tables you read | Issues ranked and explained |
| Scheduling | With a licence | Built in |
| Custom extraction | Yes, any field in the HTML | Not the point of the tool |
| Crawling staging or protected sites | Yes | Harder, it must reach the site |
| History over time | Files you keep yourself | Kept for you |
| Beside keyword and link data | No, it is a crawler | Yes, one suite |
| Best reader | Someone who enjoys a spreadsheet | Someone who wants a to-do list |

## The crawl limit question

This is what decides it for most small sites. Screaming Frog crawls up to 500 URLs free, and a licence removes the limit. Most product sites under a hundred pages never touch the ceiling.

1. **Count your real pages first** Open your sitemap and count. If the number is under 500, the free crawler covers your whole site today.
2. **Watch for URL sprawl** Parameters, filters and paginated lists multiply URLs fast. A store with 200 products can crawl to thousands of URLs, which is a finding in itself.
3. **Exclude before you upgrade** Excluding parameter patterns often brings a crawl back under the limit and tells you what to keep out of the index at the same time.
4. **Then decide** If you genuinely have thousands of pages worth crawling, pay for the crawler licence or use the audit in a suite you already have.

## Which one should you install

- You have under 500 pages and no suite: install the desktop crawler, use the free tier, and read the Search Console reports beside it.
- You already pay for Semrush: use its audit, schedule it weekly, and stop paying twice.
- You want explanations without a subscription: a desktop crawler with explained hints sits between the two.
- You manage client sites: the cloud audit wins on scheduling and sharing, whatever you personally prefer.
- You need one odd question answered ("which pages still load the old script"): only custom extraction answers it.

Whatever you install, the crawl is the input. The judgement is still yours: a list of 200 issues with no order of work is how technical debt becomes a hobby.

## The tools compared

### Screaming Frog

Crawling a site from your own machine and laying every technical fact out in tables you interpret. (screamingfrog.co.uk)

Good at: Total control over what is crawled and how; Custom extraction of any field in the HTML; Crawling staging and protected environments; Fast crawls of small sites with no queue; Free up to 500 URLs, unlimited with a licence.

Choose it when You are comfortable reading tables, you want the whole picture rather than a filtered one, or you need an answer no issue list checks for.

Not for: Someone who wants the tool to decide what matters, or a scheduled report a client can open.

### Semrush

A broad SEO suite whose Site Audit crawls from the cloud and returns issues grouped, ranked and explained, beside keyword, tracking and backlink data. (semrush.com)

Good at: Scheduled crawls that run without you; Issues explained with what to do about them; History, so a regression has a date; Sharing the same report with a team or client; Technical findings beside the queries and links of the same pages.

Choose it when You already use the suite, you want the crawl to happen on its own, or you report to someone who needs a readable list.

Not for: Arbitrary extraction, crawling a site that is not publicly reachable, or a founder who does not want a suite subscription.

**Verdict.** For a founder with one site under a few hundred pages, install the desktop crawler and stay on its free tier: a crawl of your own site, read once a quarter beside Search Console, finds the redirects, the missing titles, the noindex left over from staging and the orphan pages. Use Semrush Site Audit if you already pay for the suite, because the scheduled crawl costs you nothing extra and its explanations save a founder a week of learning. Pay for the crawler licence when URL sprawl or custom extraction makes the free ceiling a real constraint. Neither tool decides what to fix first, so keep the order of work in Search Console, where the clicks are.

## Questions

### Is Screaming Frog free?

It crawls up to 500 URLs free on Windows, macOS and Linux. A licence removes that limit and adds custom extraction, scheduling and API connections. Most product sites under a hundred pages never reach the free ceiling.

### Can I use Semrush Site Audit without the rest of the suite?

The audit is a module inside the suite rather than a standalone product, so access follows your plan. If you do not want a suite subscription, a desktop crawler covers the same technical ground for your own site.

### Which finds more issues?

They find the same facts, because both fetch the same pages. The difference is presentation: the crawler shows every field and lets you filter, the audit checks a defined list and ranks what it finds. More issues reported is not more problems worth fixing.

### Do I still need Search Console if I run a crawler?

Yes, and it matters more. A crawler sees your site as it is; Search Console reports what Google did with it: what was indexed, what was refused, what queries appeared, what was clicked. A crawl cannot tell you any of that.

### My crawl found thousands of URLs on a small site. What now?

That is the finding. Look at what is multiplying: parameters, filters, sort orders, paginated archives, tag pages. Decide which combinations deserve indexing, keep the rest out with robots rules or a noindex, and crawl again.

## Read next

- [Sitebulb vs Screaming Frog: two desktop crawlers](https://porteur.ai/compare/sitebulb-vs-screaming-frog): Both crawl on your machine. Screaming Frog is the raw table, Sitebulb the explained audit. Here is who each suits, and what to run first.
- [Free alternatives to Screaming Frog](https://porteur.ai/alternatives/screaming-frog-free-alternatives): The free crawler tier covers 500 URLs, which is most small sites. Here are the free alternatives, what each one misses, and when paying is right.
- [The best website crawlers for SEO: desktop, cloud, and free tiers](https://porteur.ai/guides/best-website-crawlers): Choose the right SEO crawler for a small site or a growing one. Screaming Frog, Sitebulb, Lumar, Oncrawl, and the suites’ audits, plus a first crawl plan.
- [Technical SEO checklist for a small site](https://porteur.ai/guides/technical-seo-checklist): Run these 20 technical SEO checks, in order. Each shows how to check it free and what fixed looks like for a site under 1,000 pages.
- [An SEO audit checklist for a small site: forty checks in order](https://porteur.ai/guides/seo-audit-checklist): Run these forty SEO checks in order on a small site. The tool to use, what a fail looks like, and what to fix next, in plain steps.
- [Screaming Frog alternatives for a one-person team](https://porteur.ai/alternatives/screaming-frog-alternatives): You need site audits that explain, not just tables. Compare desktop crawlers and hosted audits, and pick what fits your time and skills.
- [Orphan pages: finding the pages nothing links to](https://porteur.ai/guides/orphan-pages): Find orphan pages on your site, why they happen, how to compare crawl, sitemap and Search Console, and what to do: link, merge, redirect or remove.
- [Ahrefs vs Screaming Frog: an index against a crawler](https://porteur.ai/compare/ahrefs-vs-screaming-frog): One knows the web, the other knows your site. What each sees, which question each answers, and why a small site usually ends up with both.

Paste your URL and the free check reads your site the way a crawler would, then names the three findings worth your next hour, with the searches and rivals behind them. Free check: https://porteur.ai/