The Free Technical-SEO Audit Stack: GSC, Ahrefs Webmaster Tools, and Screaming Frog
The premise: a paid audit suite is probably overkill
Most solo store owners get quoted on an enterprise SEO platform before they’ve even run their first crawl, and walk away thinking a proper technical audit costs real money up front. It doesn’t. A store with one or two hundred pages can run a complete technical audit, from crawl to index to backlinks, at essentially zero cost.
A technical audit really comes down to three questions. Can crawlers reach your pages, has Google actually indexed them, and is anyone linking to you. Each of those layers has a free tool that covers it, and these are not crippled trials. They are durable free tiers you can run forever.
The points where money starts to matter are narrow and specific. Your site crosses roughly 500 URLs and needs a full crawl. You need a report someone else can read without you in the room. Or you want analytics without GA4’s weight and privacy headaches. Until one of those is true, paid tools buy you very little.
So build the free core first, then watch for the layer that gives out.
The free core: GSC, AWT, and Screaming Frog’s free tier
Start with index and query data, which is Google Search Console’s job. It’s Google handing you its own first-party data, free, and every site should have it connected. GSC tells you which pages are indexed, which are excluded and why, and gives you impressions, clicks, and average position for every query. Nothing third-party replaces this layer, because the data comes straight from Google.
Backlinks and a site audit come from Ahrefs Webmaster Tools. Verify that you own the site and it’s free to enable: you get a free site audit plus backlink data. This is the free tier of Ahrefs, so you’re running the same health checks on your own site without buying the full platform. For a small store the backlink data rarely needs more depth than this, and the free tier is plenty for watching the trend.
Crawling is where Screaming Frog SEO Spider lives. It’s a desktop crawler that installs on your machine and exists for deep technical work: duplicate titles, missing meta descriptions, broken links, redirect chains, canonical conflicts, odd status codes. One crawl surfaces all of it. The free tier covers up to 500 URLs, and it’s the indie standard for crawling.
Stack those three together and a solo store has a complete technical audit for nothing: index from GSC, backlinks from AWT, crawl from Screaming Frog. One caveat worth saying out loud. Screaming Frog is a manual, desktop tool. You open it, run it, and read the results yourself. It won’t sit in the cloud monitoring on a schedule, which is a different experience from a SaaS dashboard.
Where the free stack runs out
The first wall is Screaming Frog’s 500-URL free cap. A content site or a store with a tight catalog stays under 500 for a long time. But once you have a few hundred SKUs, each with variant pages, plus pagination and filter parameters, the URL count climbs past a thousand fast. The crawl stops at URL 500 and everything past it is invisible to you. At that point you either upgrade Screaming Frog to its paid version, around $21.58/mo (annual is roughly £199/yr), which unlocks unlimited crawling, or you switch tools. This is the real reason most people eventually pay. Not missing features, just too many pages.
The second wall is reporting. Screaming Frog hands you tables and raw data. Fine for your own eyes, but turning that into something a client or a boss can read takes real time spent sorting issues by hand and deciding what’s urgent versus cosmetic.
Sitebulb is the tool that solves exactly this. It ranks audit results by severity and wraps them in visual, client-ready reporting, so the judgment of what to fix first is done for you. The catch is cost: Cloud starts around $125/mo, with the desktop version cheaper. Sitebulb isn’t replacing a Screaming Frog feature, it’s replacing the hours you’d spend assembling a report. If you’re a freelancer shipping audits to different clients on a schedule, that price buys back labor. If you only manage your own site, a polished report has little value to you.
Under 500 URLs, auditing for your own eyes, the free stack is complete. Over 500 pages needing a full crawl, or a deliverable report, is the point where paying makes sense.
Analytics: GA4 is free but heavy, Plausible is simple but paid
Analytics breaks the pattern of the other three layers, because here the free option is the awkward one. GA4 costs nothing and does everything, but it’s heavy and complex. The event model is convoluted, the interface fights you, and cookie consent plus privacy compliance is a growing burden, especially in the EU.
Plausible and Fathom take the other road: privacy-first, GDPR and CCPA-friendly lightweight analytics. No cookies, a dashboard with a handful of core metrics, readable at a glance. The trade is that they cost money. Fathom starts around $15/mo and Plausible is similar.
Whether to pay for analytics depends on what you need from it. If you run complex conversion funnels, e-commerce event tracking, and Google Ads integration, GA4 is free and powerful, so live with the complexity. If you just want to know how many people visited, where they came from, and which pages they read, without touching a cookie consent banner or learning GA4’s event setup, then $15/mo for something clean and compliant is fair.
GA4 is free but you pay in complexity and privacy exposure. Plausible is a small fee that buys back simplicity. For small sites that second seat is usually the more comfortable one.
A recommended stack by site size
Under 500 URLs, solo store: run the pure free stack. GSC for index, AWT for backlinks and the site audit, Screaming Frog’s free tier for crawling. Start analytics on GA4 and only move to Plausible if the weight genuinely annoys you. This setup runs a complete technical audit at zero cost, so don’t rush to spend.
Growing site, near or past 500 pages: the first dollar to spend is Screaming Frog’s paid version at $21.58/mo to unlock unlimited crawling. Keep the rest free, since GSC and AWT don’t stop being enough as you scale. This is also a sensible moment to look hard at Plausible or Fathom before GA4’s compliance debt grows any larger.
Needs client reports: if you’re doing SEO freelance work or reporting up to a team on a cadence, Sitebulb at $125/mo is the right spend. It buys back the time you’d spend assembling reports by hand, with severity ranking and visual output you can send straight to a client. You may well keep both crawlers here, Screaming Frog for day-to-day digging and Sitebulb for delivery.
The table below lines up each tool by layer, price, free tier, and the moment to upgrade.
| Tool | Layer | Price | Free tier | When to upgrade |
|---|---|---|---|---|
| Google Search Console | Index + query | Free | Fully free | Never; every site should connect it |
| Ahrefs Webmaster Tools | Backlinks + audit | Free | Free after owner verification, includes site audit | Only for deep backlink analysis on full Ahrefs |
| Screaming Frog | Crawl | About $21.58/mo (annual roughly £199/yr) | Free up to 500 URLs | Site exceeds 500 URLs and needs a full crawl |
| Sitebulb | Crawl + reporting | Cloud from $125/mo (desktop cheaper) | No durable free tier | Need severity-ranked, client-ready reports |
| GA4 | Analytics | Free | Fully free | Don’t upgrade, but swap to Plausible if too heavy |
| Plausible / Fathom | Analytics | Fathom from $15/mo (Plausible similar) | No durable free tier (trial available) | Want privacy-friendly analytics without GA4’s complexity |
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