On-Page SEO Checker — Cheap, Japanese/CJK-aware

Audit a list of pages for on-page SEO and get a score from 0 to 100 with a clear list of issues — for $3 per 1,000 pages.

Built to judge Japanese, Chinese and Korean pages correctly: a good Japanese title is around 15–35 characters, not the 50–60 characters English tools expect. This checker detects the page language and applies the right limits.

What it checks

Area	Checks
Title & description	Missing, too short, too long — language-aware limits (CJK vs. Latin scripts)
Headings	Missing / multiple / empty <h1> (logo images count by alt text), skipped heading levels
Indexing	noindex in meta robots or X-Robots-Tag, canonical URL (missing or pointing elsewhere), hreflang list
Mobile & basics	Viewport meta, <html lang>, HTTPS
Social previews	Open Graph title/description/image, Twitter card
Structured data	JSON-LD types found, unparseable JSON-LD blocks
Images & links	Images without alt, internal / external / nofollow link counts
Content	Word count and CJK character count, thin-content warning
Speed (single request)	Server response time, HTML size

Each issue has a severity (error, warning, notice), a stable code and a readable message. A run SUMMARY shows the average score and the most common issues across all pages.

What can it be used for?

• Quick SEO checks of landing pages, blog posts and product pages before or after publishing
• Client reports for agencies — cheap enough to audit thousands of URLs
• Monitoring titles, noindex and canonicals after a CMS or theme change (run on a schedule)
• Auditing Japanese / multilingual sites with correct length rules

Input

Field	Description
urls	Pages to audit. Only these URLs are fetched — the Actor does not crawl.
respectRobotsTxt, minDelayPerSiteMs, maxConcurrency, timeoutSecs	Politeness and limits

Output (shortened)

{
    "url": "https://www.digital.go.jp/",
    "status": "success",
    "score": 93,
    "language": "ja",
    "issueCount": { "error": 0, "warning": 1, "notice": 0 },
    "issues": [
        { "severity": "warning", "code": "title_too_short", "message": "Title is 5 characters; recommended 15–35 for CJK language." }
    ],
    "title": "デジタル庁",
    "titleLength": 5,
    "descriptionLength": 91,
    "h1": ["デジタル庁"],
    "canonical": "https://www.digital.go.jp/",
    "htmlLang": "ja",
    "structuredDataTypes": [],
    "images": { "total": 18, "missingAlt": 0 },
    "links": { "internal": 84, "external": 18, "nofollow": 0 },
    "content": { "words": 134, "cjkCharacters": 3276 },
    "responseTimeMs": 21
}

Pricing

Event	Price
Page audited	$0.003 ($3 per 1,000 pages)

Failed pages and pages blocked by robots.txt are not charged. Platform usage is included.

Limitations

• Static HTML only (no JavaScript rendering). Content added by scripts in the browser is not seen.
• Speed figures come from one server request, not real-user Core Web Vitals.
• The score is a heuristic summary of the issues found, not Google's ranking.

Related

• Bulk URL Status & Broken Link Checker — status codes, redirects and SSL for large URL lists
• Website Technology Detector — CMS, analytics and frameworks