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These three free utilities solve different problems: inspect how crawler names match a site’s robots.txt, preview text against platform limits, or read plain-language summaries of selected Korean terms of service. Their feature and coverage details below are those described by developer Max Hwang in a September 30, 2026 post, rather than independently verified results.
Choose the tool for the task
| Tool | Use it to | Important qualification |
|---|---|---|
| AI crawler checker | See how named crawler user agents appear to match a submitted site’s robots.txt rules. |
A robots.txt result describes crawler instructions, not access control. |
| Text-limit checker | Compare text with stated platform limits and inspect potential cut points or message encoding. | Limits and display behavior can change; a preview is not a guarantee of what a platform or Google will show. |
| Korean terms summaries | Scan selected Korean services’ terms through plain-language clause cards. | Coverage is limited to the services described by the author, and summaries are not a substitute for the source terms. |
What does your robots.txt say to AI crawlers?
Hwang describes a checker that fetches a submitted domain’s robots.txt and reports a verdict for 15 user agents: GPTBot, ChatGPT-User, OAI-SearchBot, ClaudeBot, Claude-User, Claude-SearchBot, Google-Extended, PerplexityBot, Perplexity-User, Bytespider, CCBot, Amazonbot, Applebot-Extended, Diffbot, and meta-externalagent. The reported labels are allowed, partial, blocked, and no-rules. The post says the checker also returns a blocking-rule snippet for crawlers that are not already blocked.
Those labels are the tool author’s described implementation, not a statement that each crawler will actually visit, obey, or be recognized by the site. The governing standard, IETF RFC 9309, defines how compliant crawlers interpret the Robots Exclusion Protocol:
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*group when one exists. - For a requested path, the most specific matching rule takes precedence. If equally specific
AllowandDisallowrules conflict, the RFC saysAllowshould be used. - The protocol is not an authorization mechanism. The RFC states, “These rules are not a form of access authorization.” A client that ignores the rules can still request a publicly reachable URL, and paths listed in the file are themselves exposed.
Use a checker result as a quick reading of published crawl instructions, not as a security test or a guarantee about a crawler’s behavior. Google likewise describes robots.txt as a way to manage crawling, not to keep a page out of search; its robots.txt guide explains the distinction.
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Related llms.txt check
The same post describes a related /llms page that checks and generates llms.txt. It reportedly warns about missing optional sections and errors if an H1 is missing. These are feature descriptions from the post, not an independently confirmed standard-compliance assessment.
Where exactly does text get cut?
The character-limit checker is described as covering X, Instagram, LinkedIn, Threads, Bluesky, Mastodon, TikTok, YouTube, Discord, Reddit, Pinterest, Google Ads, and search-result title and description text. It reportedly highlights cut points and separately counts grapheme clusters, UTF-8 bytes, and words. For SMS, it identifies GSM-7 or UCS-2 encoding and estimates segment count.
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Those measurements can help catch overlong drafts, but they are not interchangeable: a visible symbol may comprise multiple code points, and byte limits differ from character limits. Platform rules, interfaces, and display conventions are subject to change, so check the platform’s current documentation before relying on a specific limit.
Google titles and snippets are not fixed character slots
The tool’s post also describes specialized pages for meta-description pixel-width estimates, title-tag checks, YouTube title limits that distinguish a hard cap from a default visible cut, and Discord message and embed limits with overflow splitting. Treat these as previews of the checks described by the author. Google says it generates title links from multiple sources, so a result may not reproduce the page’s title element exactly; see its title-link guidance. Google’s snippet documentation sets no fixed character limit for meta descriptions, and the snippet shown can vary. A pixel-width or character-count estimate therefore cannot promise a particular Google cutoff.
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Privacy claim
Hwang says pasted text stays in the browser and that the worker serves static files. That is the author’s description, not an independently audited privacy finding. Avoid entering sensitive material unless you have verified the tool’s current behavior and privacy terms for yourself.
Can a Korean terms summary make ToS easier to scan?
Hwang describes a Korean-language, ToS;DR-style service that presents human-written plain-language cards for clauses such as automatic renewal, refund limits, liability caps, and third-party data sharing. Cards reportedly include article references and source text, allowing readers to locate the underlying provision.
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The September 30, 2026 post lists ten services in the collection: Naver, Kakao T, KakaoPay, Toss, Gmarket, Netflix, Google, Airbnb, Albamon, and Apple Media Services. This is the author’s stated database coverage; the current collection and the underlying terms were not independently checked. Use a summary to locate issues worth reading, then consult the linked terms themselves before making a decision with legal or financial consequences.
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The post also says collection respects each site’s robots.txt, waits at least two seconds between requests, follows any Crawl-delay, and publishes summaries and source URLs rather than full source terms. These collection-practice details are author-reported, not independently verified.
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How much weight should you give the author’s test figures?
The post reports 240 regression cases for the crawler checker. It also reports 9,544 comparison values with zero mismatches in a run dated September 4, 2026. Those are the developer’s stated test counts and result, not an independent benchmark; they do not establish accuracy for every site, text, platform update, or terms entry.
Overall, the three utilities are useful as focused first-pass aids when their stated scope matches your task: inspect published crawler rules, catch likely text-limit problems, or navigate selected Korean terms. Their results should be read within those limits rather than as guarantees of access, display, privacy, or legal interpretation.
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