Fits your ask

• Free SEO audit tool with no pricing model — no flat fees, no credits to manage
• Targets small businesses and startups for core use case

Caveats

• Feature list is thin (audit, recommendations, optimization guidance listed); specific audit scope, reporting detail, and technical depth are not described

Fits your ask

• Technical SEO audit covering 80+ data points (Core Web Vitals, PageSpeed, schema markup, robots.txt, XML sitemap)
• Flat free pricing with no credits, no signup required, and unlimited scans
• No credit-based usage limits — audit as many sites as needed

Caveats

• Free tier only; no paid plan option if you later need advanced features or priority support

Fits your ask

• free to use with no credits system — all core SEO tools are completely free
• website auditing included via the Website Reviewer tool (43+ SEO, speed, and mobile-friendliness reports)

Caveats

• no subscription or flat pricing tier — the free model means no paid plan to compare against the query's 'flat price' preference
• toolbox design (150+ separate tools) rather than a cohesive audit platform; lacks the unified workflow typical of commercial SEO audit suites
• no login/registration requirement also means no account, team features, or saved audit history across sessions

Fits your ask

• Flat pricing: the entire product is free with no credit card required and nothing to unlock
• No credits system — all 70+ SEO checks (page titles, alt text, broken links, hidden pages, sitemaps, security basics, AI bot access) run without consuming or requiring credits
• Re-check workflow confirms whether fixes actually resolved issues

Caveats

• Vendor notes optional paid extras may be introduced later — currently free, but not guaranteed to remain free forever

Fits your ask

• Free tier covers 100+ technical, on-page, backlink, and content-quality SEO audits with no sign-up required
• Paid Pro plan at $79/mo includes white-label reporting and API access

Caveats

• API usage is billed per-call via a shared credit wallet — not a flat, all-inclusive price even on paid plans
• No indication of a truly flat-rate plan where all features and API calls are included at a fixed monthly cost

Fits your ask

• SEO audit is core: checks Hn tags, title attributes, alt attributes, canonical tags, hreflang, broken links, and indexability
• completely free with no credits system — all tools including the SEO Professional Audit are listed as free
• flat model: no per-scan charges, no credit depletion, no paid tiers shown

Caveats

• no competitor analysis or backlink auditing listed
• no reporting or scheduled audit features — appears to be single-scan utilities rather than a dashboard-based audit platform

Fits your ask

• SEO audit / checker as a core feature with domain rating, issues, and performance breakdown

Caveats

• Pricing structure is not transparent — no plan names, amounts, or billing terms are published; it's unclear whether paid tiers use a flat price or credit system
• Free tier exists but its scope and limits are not detailed — unclear if audits are unlimited or restricted

Fits your ask

• Free to use — no credits or subscription required
• SEO audit via Lighthouse SEO score and meta tag analysis
• No account needed; generates shareable reports

Caveats

• Single-scan tool for any public website, not a dedicated SEO audit platform for your own site
• No ongoing monitoring, keyword tracking, backlink analysis, or site health tracking — typical of full SEO audit tools
• Lighthouse SEO score is one component; lacks comprehensive SEO metrics like crawl errors, indexation, or technical SEO depth

Fits your ask

• Site audits are a core feature
• Offers a lifetime plan positioned as an alternative to monthly subscriptions

Caveats

• Pricing details are not transparent — no specific dollar amounts shown for any plan, including the lifetime option
• Lifetime/one-time purchase model does not match the 'flat price' (monthly recurring) the query implies
• No mention of credit-based usage or consumption limits, so the 'no credits' constraint cannot be confirmed

Fits your ask

• core SEO audit covering on-page, technical issues, rankings, and backlinks
• flat subscription model starting at $29/mo for the main DIY plan — no per-audit or credit-based pricing

Caveats

• GEO (AI search), Local SEO audit, and API access are separate add-on products billed independently — not included in the flat base price
• no free tier, only a 14-day trial on core plans (add-on tools bill immediately with no trial)