Tech Stack (14)
· Scale-up stack
Infrastructure
DNSSEC
Not enabled
DNS responses unsigned. Cache-poisoning vulnerable.
Green hosting
Green hosted
SSL Certificate
Google Trust Services
Valid 24 May 2026 to 22 Aug 2026
Certificate as captured in this snapshot, not a live check.
Domain Age
16.2 years
Registered Apr 2010 · Amazon Registrar, Inc.
Email Security
✓
SPF ~all (via apex substack.com)
Soft-fail (~all). Common and accepted.
✓
DKIM (via apex substack.com)
Detected on apex substack.com
✓
DMARC p=reject (via apex substack.com)
Reject (strict). Strong.
?
MTA-STS
Not deployed. Mail to your domain can be downgraded to plaintext en route.
?
TLS-RPT
Not configured. You won't hear about silent SMTP TLS handshake failures.
Storage (15)
Cookies (9)
| Name | Lifetime | Detected as |
| ab_experiment_sampled |
1y |
Substack |
| ajs_anonymous_id |
1y |
Segment |
| AWSALBTG |
7d |
Amazon Web Services |
| AWSALBTGCORS |
7d |
- |
| cf_clearance |
1y |
Cloudflare |
| cookie_storage_key |
3mo |
- |
| disable_experiments |
session |
Substack |
| disable_html_pixels |
session |
Substack |
| __cf_bm |
< 1h |
Cloudflare |
Local storage (4)
| Key | Size | Detected as |
| pub-9722747-subscribe-prompt-next-shown-at |
13 B |
Substack |
| pub-9722747-takeover-next-shown-at |
13 B |
Substack |
| substack_ref |
2 B |
Substack |
| substack_ref_url |
75 B |
Substack |
Session storage (2)
| Key | Size | Detected as |
| substack_ref |
2 B |
Substack |
| substack_ref_url |
75 B |
Substack |
Readiness Breakdown How?
✓
Custom title and meta description
✓
Open Graph tags (title, image, description)
✓
Twitter card meta tags
✓
Canonical URL declared
✓
Responsive viewport meta tag
✓
Favicon present
✓
Semantic HTML (nav, main, article)
292 ms
Server response
57%
Faster than peers
1280 ms
Largest contentful paint
0.00
Cumulative layout shift
3.6 MB
Page weight
919 KB
Image weight
5
Third-party domains
1
Console errors
1
Failed requests
⚠ 10 images: 1 without width/height, 5 missing alt text
Broken first-party requests (1), worth fixing
- 401 /api/v1/reporting/flows
Indicative grade from a single automated render, not a substitute for Lighthouse or field data, and not part of the StackScope score.
Vibe Score Breakdown How?
| Signal | Points |
| AI CSS signals |
+10 |
| AI palette signals |
+5 |
This score is based on structural patterns and is not definitive. Many legitimate sites may trigger signals, and AI-built sites may go undetected. It should be treated as an indicator, not a verdict.