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https://computerhistory.org

Content

· 5 checks — Internal links, mixed-content guards, Open Graph previews, and structured data rolled into one auditable list.
SCORE
91
GRADE
A
FIX
1
REVIEW
2
PASS
2
INFO
0
Checks
5
2 PASS 2 REVIEW 1 FIX
F
Brand Presence
Action
Site-name consistency, favicon, social image, meta tags, schema, and contact signals
FIX

Brand Presence

Your brand name differs across channels — visitors see inconsistent identity.

F

31/100

Site name appears as

Page titleCHM
og:site_nameCHM
twitter:site@ComputerHistory
Organization.name—

Inconsistent — names differ across channels

Brand assets

Favicon

8/15

single size only

Social share image

0/20

Meta completeness

8/20

Organization schema

0/15

Contact info discoverable

10/10

contact page + tel link

Findings

  • Brand name differs across channels — users see inconsistent identity
  • No social share image — shared links render as bare URLs
  • Single favicon only — add apple-touch-icon for iOS home-screen and high-DPI support
  • og:image missing
  • No Organization schema — Google can't render your logo in the knowledge panel

How consistently your brand appears across channels — shared link previews, structured data, favicon, contact info.

C
Open Graph
Action
Open Graph tags are partially configured — some improvements recommended.
REVIEW
Open Graph tags are partially configured — some improvements recommended.
Warning::
Missing og:description
The og:description tag controls the description in social sharing previews.
Warning::
Missing og:image
The og:image tag provides a preview image for social sharing.
Info::
og:title is short (4 characters)
Ideal length is 25–60 characters for social sharing previews.
Got: 4 chars Expected: 25–60 chars

The og:description tag controls the description in social sharing previews.

Why this matters

No og:description means social cards either show no subtitle or scrape the first paragraph — usually unflattering.

Learn more ▾

Without og:description, social platforms either render no subtitle or pull whatever text appears first on the page. The first paragraph is rarely written for share-card context. A purpose-written 150-200 character og:description gives a polished card.

Source: Open Graph Protocol

The og:image tag provides a preview image for social sharing.

Why this matters

No og:image means social shares are imageless — measurably less engaging than image-cards across every major platform.

Learn more ▾

Twitter, Facebook, and LinkedIn all use og:image (or twitter:image as a fallback) for share-card thumbnails. Without one, the post renders as a text-only card. A 1200x630px image (Twitter's preferred size) covers all platforms.

Source: Open Graph Protocol

URL: 4 chars

Ideal length is 25–60 characters for social sharing previews.

Expected: 25–60 chars
Why this matters

og:title very short — may render with awkward whitespace in social cards.

Source: Open Graph Protocol

Preview

No image set

computerhistory.org

Home

No description

Preview quality · Twitter/X F · 45/100
  • twitter:card — summary_large_image
  • twitter:title — falling back from og:title
  • twitter:description — Add twitter:description to give the preview body text
  • twitter:image — Add twitter:image — preview card without an image looks broken

  • No preview image for Twitter/X

    → Add og:image or twitter:image (≥300×157 for summary_large_image)

No image set

COMPUTERHISTORY.ORG

Home

No description

Preview quality · Facebook D · 50/100
  • og:title — Home
  • og:description — Add og:description to give the preview body text
  • og:image — Add og:image — preview card without an image looks broken
  • og:type — website
  • og:url — https://computerhistory.org/
  • og:site_name — CHM

  • No preview image for Facebook

    → Add og:image (recommended 1200×630)

No image set

Home

computerhistory.org

Preview quality · LinkedIn D · 50/100
  • og:title — Home
  • og:description — Add og:description to give the preview body text
  • og:image — Add og:image — preview card without an image looks broken

  • No preview image for LinkedIn

    → Add og:image (recommended 1200×627)

computerhistory.org

Home

No description

Preview quality · Slack C · 65/100
  • og:title — Home
  • og:description — Add og:description to give the preview body text
  • og:image — Add og:image — preview card without an image looks broken

  • No preview image — Slack unfurl will be text-only

    → Add og:image or twitter:image

Social preview quality

Averaged across Twitter/X, Facebook, LinkedIn, and Slack.

D · 52/100
FieldTwitter/XFacebookLinkedInSlack
og:title
og:description
og:image
og:type
og:url
og:site_name
twitter:card———
twitter:title⚠———
twitter:description———
twitter:image———
A+
Mixed Content
No mixed content detected — all resources use HTTPS.
PASS
No mixed content detected — all resources use HTTPS.
Info::
No mixed content detected — all resources use HTTPS
A+
Structured Data
1 JSON-LD block(s) found — structured data is well configured.
PASS
1 JSON-LD block(s) found — structured data is well configured.
Info::
Custom type "WebPage" — unable to validate specific properties

JSON-LD Blocks

Block 1 : WebPage
2 properties Valid
{
  "@context": "https://schema.org",
  "@graph": [
    {
      "@type": "WebPage",
      "@id": "https://computerhistory.org/",
      "url": "https://computerhistory.org/",
      "name": "Home - CHM",
      "isPartOf": {
        "@id": "https://computerhistory.org/#website"
      },
      "about": {
        "@id": "https://computerhistory.org/#organization"
      },
      "datePublished": "2019-06-25T08:09:18+00:00",
      "dateModified": "2026-03-30T20:17:24+00:00",
      "breadcrumb": {
        "@id": "https://computerhistory.org/#breadcrumb"
      },
      "inLanguage": "en-US",
      "potentialAction": [
        {
          "@type": "ReadAction",
          "target": [
            "https://computerhistory.org/"
          ]
        }
      ]
    },
    {
      "@type": "BreadcrumbList",
      "@id": "https://computerhistory.org/#breadcrumb",
      "itemListElement": [
        {
          "@type": "ListItem",
          "position": 1,
          "name": "Home"
        }
      ]
    },
    {
      "@type": "WebSite",
      "@id": "https://computerhistory.org/#website",
      "url": "https://computerhistory.org/",
      "name": "CHM",
      "description": "Computer History Museum",
      "publisher": {
        "@id": "https://computerhistory.org/#organization"
      },
      "potentialAction": [
        {
          "@type": "SearchAction",
          "target": {
            "@type": "EntryPoint",
            "urlTemplate": "https://computerhistory.org/?s={search_term_string}"
          },
          "query-input": {
            "@type": "PropertyValueSpecification",
            "valueRequired": true,
            "valueName": "search_term_string"
          }
        }
      ],
      "inLanguage": "en-US"
    },
    {
      "@type": "Organization",
      "@id": "https://computerhistory.org/#organization",
      "name": "Computer History Museum",
      "url": "https://computerhistory.org/",
      "logo": {
        "@type": "ImageObject",
        "inLanguage": "en-US",
        "@id": "https://computerhistory.org/#/schema/logo/image/",
        "url": "https://computerhistory.org/wp-content/uploads/2019/07/chm_logo_400x400.jpg",
        "contentUrl": "https://computerhistory.org/wp-content/uploads/2019/07/chm_logo_400x400.jpg",
        "width": 800,
        "height": 800,
        "caption": "Computer History Museum"
      },
      "image": {
        "@id": "https://computerhistory.org/#/schema/logo/image/"
      },
      "sameAs": [
        "https://www.facebook.com/computerhistory/",
        "https://x.com/ComputerHistory",
        "https://www.instagram.com/computerhistory/",
        "https://www.youtube.com/user/ComputerHistory",
        "https://en.wikipedia.org/wiki/Computer_History_Museum"
      ]
    }
  ]
}
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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