LeveL.L Releases "L-Check," a Free Diagnostic Tool Specializing in 71 Technical SEO Items
LeveL.L Inc. has released "L-Check," a free diagnostic tool specializing in technical SEO. By simply entering a URL, it comprehensively diagnoses 71 technical SEO items in about 30 seconds, providing a score, prioritized improvement actions, and personalized comments.
📋 Article Processing Timeline
- 📰 Published: May 11, 2026 at 19:10
- 🔍 Collected: May 11, 2026 at 10:31
- 🤖 AI Analyzed: May 12, 2026 at 07:11 (20h 39m after Collected)
LeveL.L Inc. (Representative Director: Itoh Kyosuke) today released "L-Check," a free diagnostic tool specializing in technical SEO.
Tool screen capture
This tool is an industry-leading diagnostic tool that, by simply entering a URL, comprehensively diagnoses 71 technical SEO items across 11 categories in approximately 30 seconds. It provides a score out of 100, prioritized improvement actions, and even 40 patterns of individual comments from Representative Director Itoh. It is completely free and requires no membership registration.
▼ L-Check Service Site
https://levell.co.jp/seo-check/
[Background] Making the "Black Box" of the SEO Industry a More Accessible Measure
SEO measures remain a closed domain handled only by a few specialists, and web managers and business owners of companies continue to be unable to grasp "the current state of their own sites."
Even while supporting the web marketing of small and medium-sized enterprises, we have received many comments like the following:
* Proposals from production companies and SEO agencies are black boxes, making it impossible to judge what is correct.
* Existing free SEO diagnostic tools only provide scores, but ultimately don't explain "what to do."
* Even when asking AI for diagnostic results, only abstract answers are returned, making the next step unclear.
* Despite implementing measures, search rankings do not improve easily.
The root cause of this situation is the obscurity of technical SEO, which is the "foundation." We believed there was a need for a place where anyone could easily check whether their site's structure is correctly evaluated by search engines before focusing on content measures.
Therefore, under the vision of "Towards a world where corporate public relations personnel can master SEO," we developed and released "L-Check," a free diagnostic tool specializing in the technical domain.
[Service Overview] What is L-Check?
"L-Check" is a free web tool that, by simply entering a URL, can comprehensively diagnose 71 technical SEO items in approximately 30 seconds.
While general SEO tools are designed for "broad and shallow coverage," this tool focuses on the technical domain and specializes in in-depth diagnosis with the highest number of items in the industry. Diagnostic results are displayed with a score from 0 to 100 points and a 5-stage grade (S/A/B/C/D), and improvement items are clearly prioritized in 4 stages: Critical / High / Medium / Low.
Furthermore, it automatically extracts the top 3 priority items from the failing items, indicating "just do these three first." For sites that already have a high technical completion level, it is designed to automatically guide them to content review actions.
[Main Functions] 7 Functions to Guide Your Next Step
No | Function | Content
---|---|---
1 | Comprehensive diagnosis of 71 items across 11 categories | Comprehensively diagnoses with the highest number of items in the industry, specializing in technical SEO
2 | Scoring out of 100 points | 0-100 points + 5-stage grade judgment (S/A/B/C/D)
3 | 4-stage prioritization | Clearly indicates improvement order with Critical / High / Medium / Low
4 | Automatic extraction of "just do these three first" | Automatically picks up the top 3 priority items from failing items
5 | Individual comments from the Representative Director | Displays one of 40 patterns based on score range x weak category combination
6 | Rich result determination | Diagnoses the implementation status of structured data such as FAQ, Article, Organization
7 | Copy-pasteable consultation template | Allows consultation with us by simply pasting the diagnostic results
[Diagnostic Items] Breakdown of 11 Categories and 71 Items
The breakdown of the industry's highest standard of 71 items is as follows. The scoring is based on our unique perspective.
The heaviest emphasis is placed on indexability (index and URL-related structure). This is because while the TOP page may be fine, cases where SEO is not done at all are often seen once you enter the lower-level pages. There will be no oversight if you enter several URLs of major pages.
No | Category | Score | Number of Items
---|---|---|---
1 | Indexability | 26 | 12
2 | Title/Meta Information | 10 | 6
3 | Heading Structure | 8 | 7
4 | Keyword Inclusion | 11 | 10
5 | Structured Data/Rich Results | 8 | 8
6 | Image Optimization | 6 | 5
7 | Internal Links | 5 | 5
8 | OGP/SNS | 2 | 2
9 | Mobile/HTML Quality | 4 | 5
10 | Performance/Security | 5 | 8
11 | Content Enrichment | 15 | 3
From basic items like HTTPS, noindex, canonical, to JSON-LD structured data, W
Tool screen capture
This tool is an industry-leading diagnostic tool that, by simply entering a URL, comprehensively diagnoses 71 technical SEO items across 11 categories in approximately 30 seconds. It provides a score out of 100, prioritized improvement actions, and even 40 patterns of individual comments from Representative Director Itoh. It is completely free and requires no membership registration.
▼ L-Check Service Site
https://levell.co.jp/seo-check/
[Background] Making the "Black Box" of the SEO Industry a More Accessible Measure
SEO measures remain a closed domain handled only by a few specialists, and web managers and business owners of companies continue to be unable to grasp "the current state of their own sites."
Even while supporting the web marketing of small and medium-sized enterprises, we have received many comments like the following:
* Proposals from production companies and SEO agencies are black boxes, making it impossible to judge what is correct.
* Existing free SEO diagnostic tools only provide scores, but ultimately don't explain "what to do."
* Even when asking AI for diagnostic results, only abstract answers are returned, making the next step unclear.
* Despite implementing measures, search rankings do not improve easily.
The root cause of this situation is the obscurity of technical SEO, which is the "foundation." We believed there was a need for a place where anyone could easily check whether their site's structure is correctly evaluated by search engines before focusing on content measures.
Therefore, under the vision of "Towards a world where corporate public relations personnel can master SEO," we developed and released "L-Check," a free diagnostic tool specializing in the technical domain.
[Service Overview] What is L-Check?
"L-Check" is a free web tool that, by simply entering a URL, can comprehensively diagnose 71 technical SEO items in approximately 30 seconds.
While general SEO tools are designed for "broad and shallow coverage," this tool focuses on the technical domain and specializes in in-depth diagnosis with the highest number of items in the industry. Diagnostic results are displayed with a score from 0 to 100 points and a 5-stage grade (S/A/B/C/D), and improvement items are clearly prioritized in 4 stages: Critical / High / Medium / Low.
Furthermore, it automatically extracts the top 3 priority items from the failing items, indicating "just do these three first." For sites that already have a high technical completion level, it is designed to automatically guide them to content review actions.
[Main Functions] 7 Functions to Guide Your Next Step
No | Function | Content
---|---|---
1 | Comprehensive diagnosis of 71 items across 11 categories | Comprehensively diagnoses with the highest number of items in the industry, specializing in technical SEO
2 | Scoring out of 100 points | 0-100 points + 5-stage grade judgment (S/A/B/C/D)
3 | 4-stage prioritization | Clearly indicates improvement order with Critical / High / Medium / Low
4 | Automatic extraction of "just do these three first" | Automatically picks up the top 3 priority items from failing items
5 | Individual comments from the Representative Director | Displays one of 40 patterns based on score range x weak category combination
6 | Rich result determination | Diagnoses the implementation status of structured data such as FAQ, Article, Organization
7 | Copy-pasteable consultation template | Allows consultation with us by simply pasting the diagnostic results
[Diagnostic Items] Breakdown of 11 Categories and 71 Items
The breakdown of the industry's highest standard of 71 items is as follows. The scoring is based on our unique perspective.
The heaviest emphasis is placed on indexability (index and URL-related structure). This is because while the TOP page may be fine, cases where SEO is not done at all are often seen once you enter the lower-level pages. There will be no oversight if you enter several URLs of major pages.
No | Category | Score | Number of Items
---|---|---|---
1 | Indexability | 26 | 12
2 | Title/Meta Information | 10 | 6
3 | Heading Structure | 8 | 7
4 | Keyword Inclusion | 11 | 10
5 | Structured Data/Rich Results | 8 | 8
6 | Image Optimization | 6 | 5
7 | Internal Links | 5 | 5
8 | OGP/SNS | 2 | 2
9 | Mobile/HTML Quality | 4 | 5
10 | Performance/Security | 5 | 8
11 | Content Enrichment | 15 | 3
From basic items like HTTPS, noindex, canonical, to JSON-LD structured data, W