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celus.io website review
Visit site (opens in a new tab)Reviewed 20 October 202637 issues · 95 checks
This review found 37 issues worth fixing on celus.io, 10 of them high impact, across 95 checks. The most urgent: mobile performance score: 49. Your full playbook turns these into prioritised fixes alongside reviews, competitors and channels.
- Homepage
- Phone render
- Links and pages
- Google PageSpeed
Google PageSpeed Insights (opens in a new tab), mobile
Site score
68DClosest competitors among reviewed websites
Compare side by sideShow as table
| Date | Real-visitor load time (LCP) |
|---|---|
| May 2, 2026 | 2.5 s |
| May 9, 2026 | 2.6 s |
| May 16, 2026 | 2.6 s |
| May 23, 2026 | 2.6 s |
| May 30, 2026 | 2.6 s |
| Jun 6, 2026 | 2.6 s |
| Jun 13, 2026 | 2.5 s |
| Jun 20, 2026 | 2.6 s |
| Jun 27, 2026 | 2.6 s |
| Jul 4, 2026 | 2.6 s |
| Jul 11, 2026 | 2.7 s |
| Jul 18, 2026 | 2.6 s |
| Jul 25, 2026 | 2.5 s |
| Aug 1, 2026 | 2.5 s |
| Aug 8, 2026 | 2.5 s |
| Aug 15, 2026 | 2.5 s |
| Aug 22, 2026 | 2.5 s |
| Aug 29, 2026 | 2.7 s |
| Sep 5, 2026 | 2.7 s |
| Sep 12, 2026 | 2.9 s |
| Sep 19, 2026 | 3.1 s |
| Sep 26, 2026 | 3.1 s |
| Oct 3, 2026 | 3.2 s |
| Oct 10, 2026 | 3.4 s |
| Oct 17, 2026 | 3.4 s |
Show as table
| Date | Real-visitor tap response (INP) |
|---|---|
| May 2, 2026 | 135 ms |
| May 9, 2026 | 136 ms |
| May 16, 2026 | 141 ms |
| May 23, 2026 | 141 ms |
| May 30, 2026 | 145 ms |
| Jun 6, 2026 | 149 ms |
| Jun 13, 2026 | 160 ms |
| Jun 20, 2026 | 159 ms |
| Jun 27, 2026 | 152 ms |
| Jul 4, 2026 | 151 ms |
| Jul 11, 2026 | 146 ms |
| Jul 18, 2026 | 147 ms |
| Jul 25, 2026 | 146 ms |
| Aug 1, 2026 | 143 ms |
| Aug 8, 2026 | 149 ms |
| Aug 15, 2026 | 162 ms |
| Aug 22, 2026 | 186 ms |
| Aug 29, 2026 | 198 ms |
| Sep 5, 2026 | 204 ms |
| Sep 12, 2026 | 209 ms |
| Sep 19, 2026 | 206 ms |
| Sep 26, 2026 | 210 ms |
| Oct 3, 2026 | 217 ms |
| Oct 10, 2026 | 216 ms |
| Oct 17, 2026 | 222 ms |
Chrome UX Report (opens in a new tab): real Chrome visitors over rolling 28-day periods.
One score from every part of this review. How it works
Speed
Mobile performance score: 49
49/100Your mobile performance score is 49 (desktop: 95). Under 50 is Google's “poor” band: many phone visitors leave before the page is usable.
6 third-party services on the page
6 third-party services load with your homepage (framerusercontent.com, Cookiebot and framer.com and others), adding 6.3 MB and 931 ms of main-thread time.
framerusercontent.com adds 744 ms
744 msframerusercontent.com costs a phone 744 ms of main-thread work and 5.8 MB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.
Reduce unused JavaScript
450 ms · 124 KiBAbout 124 KiB of JavaScript is downloaded but never used on this page. Google estimates it would make the page about 450 ms faster on a phone.
Render-blocking requests
450 ms1 file blocks the first paint until they finish downloading. Deferring or inlining it could save about 450 ms.
Use efficient cache lifetimes
300 ms · 65 KiB7 files are served with short cache lifetimes, so returning visitors download them again (65 KiB).
Improve image delivery
310 KiB2 images could be 310 KiB smaller with modern formats (WebP or AVIF) and sizes that fit a phone screen.
Main-thread work: 2.9 s
A phone's processor spends 2.9 s on main-thread work while loading, 1.2 s of it running JavaScript. Above 2 s, taps and scrolls feel sluggish.
1,575 HTML elements
The page has 1,575 HTML elements. Above 1,500, rendering and every interaction get slower on phones.
Google Fonts adds 0 ms
0 msGoogle Fonts costs a phone 0 ms of main-thread work and 293 KiB of downloads while your page loads. Loading it after the page is usable, or only on the pages that need it, takes that off the critical path.
3 long tasks on the main thread
3 long tasks block the main thread while loading, the longest for 83 ms. During a long task the page ignores taps.
Reduce unused CSS
14 KiBAbout 14 KiB of CSS is downloaded but never applied on this page.
Phones get a much slower page than desktops
Desktop scores 95 but mobile only 49. A gap that wide usually means heavy scripts and images that hit phones hardest.
Chained critical requests
Critical files load one after another instead of in parallel (3 chains). Preconnecting to key origins and preloading the hero image shortens the chain.
Forced reflow
Scripts make the browser recalculate the layout repeatedly while the page loads, which wastes processor time on phones.
1 checks passed
Server response: 63 ms
63 msYour server sent the HTML in 63 ms, well inside Google's 600 ms guideline.
Core Web Vitals
Fails Core Web Vitals for real visitors
Real Chrome users on phones do not pass Google's Core Web Vitals on this page (28-day field data from the Chrome UX Report (opens in a new tab)). Google uses this in ranking.
Largest Contentful Paint: 9.8 s
9.8 sYour largest element takes 9.8 s to render on a phone. Google's threshold for “good” is 2.5 s. The largest element is the text “From requirements to a complete design, with you in control…”.
First Contentful Paint: 6.7 s
6.7 sThe first text or image appears after 6.7 s on a phone. Good is under 1.8 s.
Time to Interactive: 9.9 s
9.9 sThe page becomes fully interactive after 9.9 s. Good is under 3.8 s.
Speed Index: 7.2 s
7.2 sVisually, the page fills in at 7.2 s (Speed Index). Good is under 3.4 s.
Real-user LCP: 3.7 s
3.7 sReal visitors wait 3.7 s for the largest content to appear (75th percentile). Good is under 2.5 s.
Real-user INP: 228 ms
228 msReal visitors wait 228 ms for the page to respond to a tap (75th percentile). Good is under 200 ms.
Real-user CLS: 0.21
0.21For real visitors the layout shifts by 0.21 (75th percentile). Good is under 0.1.
Tap response (INP) got 62% slower for real visitors
+62%Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' tap response (inp) went from 135 ms to 222 ms at the 75th percentile (Chrome UX Report (opens in a new tab) history).
Largest content (LCP) got 35% slower for real visitors
+35%Over the last 25 four-week periods to 2026-10-17, real Chrome visitors' largest content (lcp) went from 2.5 s to 3.4 s at the 75th percentile (Chrome UX Report (opens in a new tab) history).
Real-user FCP: 1.9 s
1.9 sReal visitors see the first content after 1.9 s (75th percentile). Good is under 1.8 s.
Cumulative Layout Shift: 0.189
0.189The layout shifts by 0.189 while loading, so content jumps under the reader's thumb. Good is under 0.1.
2 checks passed
Real-user TTFB: 721 ms
721 msReal visitors wait 721 ms for your server to start answering (75th percentile). Good is under 800 ms.
Total Blocking Time: 0 ms
0 msScripts block the page for only 0 ms while loading. Good is under 200 ms.
Images and page weight
Page weight: 6.4 MB in 63 requests
6.4 MBYour homepage downloads 6.4 MB in 63 requests on a phone: media 5.0 MB (2), scripts 509 KiB (28) and images 459 KiB (19). Under 2 MB keeps phones on slow connections fast.
About 1.8 g of CO₂ per visit
1.81 gBy the Sustainable Web Design model, a visit to your homepage emits about 1.81 g of CO₂e: 216.7 kg a year at 10,000 visits a month. It scales with page weight, so every byte cut lowers it.
3 checks passed
Images use modern formats
Every sizeable image is WebP, AVIF or SVG.
Images load when needed
Images below the first screen wait until the visitor scrolls to them.
Images are sized for phones
No image is downloaded at more than three times the size it is drawn on a phone.
Accessibility
19 text elements with low contrast
19 text elements don't have enough contrast against the background to read easily, especially outdoors on a phone.
Elements must only use permitted ARIA attributes (1 element)
Elements must only use permitted ARIA attributes: 1 element on the page fails this check, rated serious by axe-core.
All page content should be contained by landmarks (29 elements)
All page content should be contained by landmarks: 29 elements on the page fail this check, rated moderate by axe-core.
No main landmark
The page has no <main> landmark, so screen-reader users cannot jump straight to the content.
1 link without text
1 visible link has no text or label, so screen readers cannot say where it goes.
2 checks passed
Every image has alt text
All 42 images in the HTML carry an alt attribute.
39 automated accessibility rules passed
axe-core 4.13.0, the open-source engine behind most accessibility testing tools, ran 44 WCAG 2.2 A/AA and best-practice rules on the phone render: 39 passed and 5 failed. 2 mores need a person to judge. Automated rules catch about a third of accessibility problems; the rest need manual testing.
SEO
No structured data
No structured data (JSON-LD), so Google can't show rich results such as your logo, ratings or FAQs.
3 H1 headlines
There are 3 <h1> headlines (“Imagine it. Describe it. Our agents design it, yo…”, “Imagine it. Describe it. Our agents design it, yo…” and “Imagine it. Describe it. Our agents design it, yo…”). One clear main headline is easier for people and search engines.
22 internal links, 32 external
The homepage links to 22 pages on celus.io and 32 external pages.
6 checks passed
Meta description: 160 characters
Your meta description is 160 characters: “From requirement to design. CELUS agents capture what you need, search millions of components, and generate a working s…”.
Title: 38 characters
Your title is a healthy 38 characters: “AI Electronics Design Platform | CELUS”.
Canonical URL set
The canonical URL is https://www.celus.io/.
Open Graph tags complete
Open Graph tags are complete, so shared links show a title, description and image.
robots.txt in place
robots.txt is in place and points crawlers to your sitemap.
XML sitemap found
Your XML sitemap is reachable at https://www.celus.io/sitemap.xml.
AI search readiness
No Organization structured data
There is no Organization (or LocalBusiness) JSON-LD, so search engines and AI assistants have no machine-readable facts about who runs the site: its name, logo, profiles and contact details.
3 checks passed
AI answer engines may read the site
Your robots.txt lets the crawlers behind ChatGPT search, Claude and Perplexity read the site and cite it in answers.
Text is in the HTML
Your server sends the page's text in the HTML (1,373 words), so crawlers that don't run JavaScript still read it.
llms.txt published
The site publishes /llms.txt (10 KiB, 59 links), a plain-text guide to the site for AI tools.
Other pages
1 page without an H1
/knowledge has no <h1> headline, so visitors and search engines get no clear main topic.
1 page with very little text
/legal/cookie-declaration has under 150 words in the HTML. Thin pages rarely rank; if the text loads with JavaScript, crawlers that don't run it see even less.
8 internal pages checked
We fetched 8 pages linked from your homepage and read each the way a search engine does.
6 checks passed
Linked pages load
All 8 pages we checked loaded without an error.
Canonical URLs point to themselves
No page we checked hands its ranking to a different URL.
Every page has a meta description
All 8 pages that loaded have a meta description.
Titles are unique
Every page we checked has its own title.
No linked page is hidden from search
None of the pages we checked carries a noindex tag.
Every page has a title
All 8 pages that loaded have a <title>.
Best practices
1 JavaScript error while loading
1 error was logged to the browser console while the page loaded, for example “Failed to load resource: net::ERR_FAILED”.
1 distorted image
1 image is displayed at the wrong aspect ratio, so it looks stretched or squashed.
2 checks passed
Tap targets are thumb-sized
18 of 20 tappable elements near the top are at least 24 px.
Mobile viewport set
The page declares a mobile viewport.
Security and trust
No Content-Security-Policy
No Content-Security-Policy header, the main browser-side defence against injected scripts.
No clickjacking protection
Neither X-Frame-Options nor a CSP frame-ancestors policy is set, so any site can embed yours in a frame.
No Referrer-Policy
No Referrer-Policy header, so full URLs can leak to the sites you link to.
No Permissions-Policy
No Permissions-Policy header to switch off camera, microphone and location for embedded content.
No security.txt
There is no /.well-known/security.txt telling researchers how to report a security problem to you.
6 checks passed
Served over HTTPS
The homepage is served over HTTPS (celus.io).
Valid certificate (89 days left)
The certificate from Let's Encrypt · YE2 verifies for celus.io and is valid for another 89 days.
HSTS enabled
Strict-Transport-Security is set, so browsers always use https.
http:// redirects to https
http://celus.io redirects to the secure version.
HTTP/2 and HTTP/3
The server speaks HTTP/2 and advertises HTTP/3, so browsers load many files over one connection.
All 28 links work
All 28 links checked from your homepage (9 internal, 19 external) answered without errors.
Domain and trust
No CAA record
celus.io has no CAA record, so any certificate authority may issue a certificate for it. A CAA record naming your provider (for example letsencrypt.org) closes that door.
Content and conversion
No social proof
No testimonials, customer logos, ratings or customer counts on the homepage: nothing tells a new visitor that others already trust you.
No direct contact details
No phone number or email link on the homepage, so ready-to-buy visitors have one fewer way to reach you.
No risk reducer
No guarantee or risk reducer (money-back, free trial, no credit card) is mentioned, which is often what tips a hesitant visitor.
About 961 words of copy
The homepage carries about 961 words of visible text.
4 checks passed
Clear next step on the first screen
On a phone, the first screen shows a clear next step: “Get started”.
9 calls to action
The homepage has 9 calls to action, for example “Contact”, “Get started” and “Contact Us”.
3 short forms
3 short forms (1 field at most) are right on the homepage.
Analytics in place
Analytics detected: Google Tag Manager.
Email authentication
Email authentication score: 90/100
Email authentication: SPF record 25 points, plus 15 when it ends in -all (10 for ~all); DMARC record 25, plus 25 for a reject policy (15 for quarantine); a DKIM key on a common selector 10.
3 checks passed
DMARC policy: quarantine
DMARC tells receivers to quarantine mail that fails authentication.
SPF with a strict ending (-all)
An SPF record lists your sending servers and tells receivers to reject anything else: “v=spf1 include:spf.protection.outlook.com include:spf.mailjet.com include:mailgun.org include:7288952.spf05.hubspotemai…”.
DKIM signing found
A DKIM key is published (selector “selector1”, “selector2” and “hs1”), so receivers can verify mail really came from you.
Privacy and tracking
1 tracker load before any consent
1Before a visitor clicks anything, the page loads HubSpot (measured from a US location before any click). A consent tool (Cookiebot) is installed; check it blocks these until visitors agree where the law requires it.
8 other companies contacted
Loading the homepage contacts 8 hosts run by other companies (fonts, scripts, analytics, ads), each of which sees the visitor's IP address.
1 checks passed
Consent tool: Cookiebot
A consent management tool (Cookiebot) loads with the page.
Upkeep, stack and company
No signs of neglect in what was checked: the copyright year, CMS and plugin versions, and jQuery.
Stack
- CMS
- Framer 0da2bc6
- Analytics
- Google Tag Manager
Upkeep, stack, hiring and company data from programmable.info
Go beyond the website
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