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restack.io

https://restack.io· First analyzed 24 May 2026· Updated 24 May 2026
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restack.io
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Mobile screenshot of restack.io
Mobile

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Hosting Provider

Amazon Web Services (AWS)
aws.amazon.com

IP Address

18.165.140.31

Site Location

🇫🇮 Finlandvia ip

Server Location

🇫🇮 Helsinki, Finland

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

Vercel

Nameservers

ns-1198.awsdns-21.org.ns-1556.awsdns-02.co.uk.ns-400.awsdns-50.com.ns-513.awsdns-00.net.

Performance

98

Core Web Vitals

Weight

First Contentful Paint
876 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
837 KB
41 requests

Image Optimization

ResponsiveVercel Image Optimization
0–49
50–89
90–100

Architecture Stack

JAMstack
⚡ SSG
Decoupled
Frontend
Framework
Next.js
Styling
Tailwind CSS
API
Data Source
Headless CMS
Sanity
Infrastructure
Platform
Vercel
CDN
Vercel Image

Detected API Sources

/_next/image?url=https%3A%2F%2.../_next/image?url=https%3A%2F%2...

Technology Stack

4 Technologies Detected

Meta Frameworks

1
Next.js

CSS Frameworks

1
Tailwind CSS

Analytics

1
Google Analytics

Platforms

1
Vercel

SEO Analysis

C63/100
18
8
1
Meta Tags9/15
Content7/12
Headings8/8
Technical15/25
E-E-A-T0/7
Images5/7
Links5/5
URL5/5
Social2/5
Freshness0/4
Mobile4/4
Indexability3/3
R
restack.iorestack.io

Where product teams design, test and optimize agents at Enterprise ...

The open-source stack enabling product teams to improve their agent experience while engineers make them reliable at scale on Kubernetes.

Title truncated.
Title Length82 chars

Recommended: 50-60 chars (~503px / 580px)

Description Length137 chars

Recommended: 120-160 chars

Issues (1)

  • • Title is too long (82 chars, ~503px). Will be truncated in search results.

9 issues found

Upgrade to view details

Crawlability

Sitemap

Type: index

1 URLs

1 sub-sitemaps

robots.txt

9 rules

Sitemap reference found

Local SEO

Local Search Readiness

6/100
Poor
2 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D46/100
Bot Access
20/25
Machine Read.
12/25
Schema Data
0/25
Citation
14/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
Text ratio:5%
Words:383
Token eff.:Optimal
Sections/1K:36.6

Structured Data

No Schema

Citation Readiness

Opening Summary33w
Descriptive Headingsavg 3.3w
Canonical URL
Open Graph3/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (9)
AI readiness recommendation preview...
Upgrade to view recommendations

Sponsored

Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
A
86/100
14
Passed
1
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
18/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
9/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •Accessibility recommendation preview...
Upgrade to view recommendations

Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
65/100
B
85 mg
CO₂e / view
837.4 KB
Page Weight
80%
Cleaner Than
New Visitor
97 mg
vs
Returning (cached)
48 mg
Annual (10K/mo)
10.2 kg
Emission Segments
Data Center
4 mg
Network
25 mg
Device
56 mg
Resource Breakdown
JavaScript
564.2 KB
CSS
20.3 KB
Fonts
69.7 KB
HTML
11.8 KB
Other
171.4 KB
Green Hosting Verified
Amazon Web Services (AWS)
Provider Match
2 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
B

Security Score

76%Good
Static / Informational

HTTPS

No WAF

29d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

25.03.2026

Valid Until

23.06.2026

Subject Alternative Names (1)

www.restack.io

SHA-256 Fingerprint

AB:31:69:E2:8A:F3:31:9A:08:72:B9:43:D6:A0:70:3E:D0:C5:C8:01...

Recommendations

Security recommendation preview

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Upgrade to view header details

HTTP Headers

Developer Console

age
14
cache-control
🟡 0s(public, max-age=0, must-revalidate)
content-encoding
⚡ Brotli(br)
content-type
text/html; charset=utf-8
date
Thu, 14 May 2026 20:57:33 GMT
etag
W/"123zi4anxi210uj"
Good Warning Issue

Email Infrastructure

Google Workspace

Score

90

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (5)

aspmx.l.google.com
alt3.aspmx.l.google.com
alt4.aspmx.l.google.com
alt2.aspmx.l.google.com

+1 more

Domain Information

restack.io

Domain Age
6y 2m

Created

28.02.2020

Expires

28.02.2027

Last Updated

29.01.2026

Registrar

Gandi SAS

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
C
65/100
Mobile Friendly
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
Viewport
width=device-width, initial-scale=1.0
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

__Space_Grotesk_dd5b2f + __Inter_f367f3

WCAG Partial
71/100
Readability
/30
23/30

20px · LH 1.38

Hierarchy
/20
16/20

2.4x ratio · ✓ H1→H6

WCAG
/25
16/25

1.55:1 min contrast

Performance
/25
16/25

3 fonts · 2 req

Heading Font

__Space_Grotesk_dd5b2f

Sans48px

Body Font

__Inter_f367f3

Sans20px

Contrast Ratio

1.55:1

14 issues

Reading Comfort

~37 CPL

Narrow lines
48px
h1
48px
h2
24px
h3
20px
p

✅ Excellent readability: 20px body text is ideal for all devices.

⚠️ Tight line spacing (1.38). Increase to 1.4–1.6 for better readability.

⚠️ Hard to read: Flesch score 32/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 14 elements below WCAG AA threshold (min 1.6:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

✅ Strong hierarchy: Headlines are 2.4x larger than body text.

Buy on MyFontsFlesch 32

Color Palette

9 unique colors
5.34:1 AA Light
#ffffff
Background· 94.09999999999997%
#676b74
Other· 0.7%
#20283f
Primary· 1.1%
#28479a
Accent· 0.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

21 Resources

20
Scripts
1
Styles
0
Async
20
Defer

Top Script Sources

local(20)

Website Identity

restack.io

6 years old
Location detected: 🇫🇮 Finlandvia ip
Gandi SAS📧 Google Workspaceen

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Last analyzed: 24 May 2026 at 10:58

Historical Analysis & Change Tracking