What technology does cello.so use?

cello.so is built with PHP, WordPress, Apache.

Is cello.so secure (HTTPS)?

Yes. cello.so uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 9, 2026.

Hosting provider information for cello.so is not available yet.

What is cello.so's SEO score?

cello.so scored 90/100 for SEO in the latest analysis (excellent).

What is cello.so's overall website score?

cello.so has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.

Has cello.so's score changed over time?

cello.so's overall score has declined by 1 point (from 89 to 88) since Jul 26, 2026.

cello.so

Cello | User-led growth platform for SaaS

Last scanned Aug 2, 2026, 8:00 AM · 10 views

Overall score

Great

Summary

Turn users into your most valuable growth channel. This website uses WordPress. SEO is excellent (90/100) and accessibility is excellent (100/100). Security scores fair (65/100) and performance excellent (100/100). Top issue: robots.txt not found.

Turn users into your most valuable growth channel. Cello is the easiest way to add a user referral program to any SaaS product in hours.

Top issues to fix

7 issues found · 2 high priority

Missing Strict-Transport-Security header
Security
Add HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing X-Content-Type-Options header
Security
Add X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing X-Frame-Options header
Security
Add X-Frame-Options (or a CSP frame-ancestors rule) to prevent clickjacking via hidden iframes.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.

+1 more issue — details in the sections below.

SEO

2 issue(s) found

100

Performance

132 ms

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Score history

-1 overall since Jul 26, 2026

Overall: 88
SEO: 90
Security: 65
Performance: 100
Accessibility: 100

Organization

Company details published in this site's own structured data.

Turn users into your most valuable growth channel. Cello is the easiest way to add a user referral program to any SaaS product in hours.

Facebook X (Twitter)LinkedIn

Contact

Email, phone, and address published on this site's own pages.

Email: support@cello.so

Meta tags

Title: Cello | User-led growth platform for SaaS
Description: Turn users into your most valuable growth channel. Cello is the easiest way to add a user referral program to any SaaS product in hours.
Canonical: https://cello.so/
Language: en
Charset: utf-8
Viewport: width=device-width, initial-scale=1, maximum-scale=5.0
Robots meta: index, follow, max-image-preview:large, max-snippet:-1, max-video-preview:-1
Manifest

Technologies

Detected frameworks, languages, and tools.

PHP WordPress Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
IP address: —
ASN: —

DNS records

Type	Value
A	—
AAAA	—
MX	—
TXT	—
NS	—
CAA	—
CNAME	—
IPv6 support	No

TLS / SSL certificate

Version: TLS 1.3
Issuer: Let's Encrypt
Subject: cello.so
Valid from: Jun 11, 2026
Valid to: Sep 9, 2026
Days until expiry: 37
SAN domains: cello.so

Security headers

Strict-Transport-SecurityMissing
Content-Security-PolicyMissing
X-Frame-OptionsMissing
X-Content-Type-OptionsMissing
Referrer-PolicyMissing
Permissions-PolicyMissing

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 11 · H3 1

Links

52 internal · 8 external · 20 broken

Images

99 total · 0 missing alt

Scripts / Styles

19 scripts · 5 stylesheets

JS / CSS size

6.7 KB · 15.2 KB

Page size

155 KB

Robots.txt & Sitemap

robots.txt: Not found
Disallow rules: 0
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

robots.txt not found
sitemap.xml not found

Scan details

Requested URL: https://cello.so
Final URL: https://cello.so
HTTP status: 200
HTTP version: HTTP/2
Response time: 129 ms
HTML size: 155 KB
Redirect chain: https://cello.so

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does cello.so use?: cello.so is built with PHP, WordPress, Apache.
Is cello.so secure (HTTPS)?: Yes. cello.so uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Sep 9, 2026.
Who hosts cello.so?: Hosting provider information for cello.so is not available yet.
What is cello.so's SEO score?: cello.so scored 90/100 for SEO in the latest analysis (excellent).
What is cello.so's overall website score?: cello.so has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.
Has cello.so's score changed over time?: cello.so's overall score has declined by 1 point (from 89 to 88) since Jul 26, 2026.