
Requestly
modheader
Header Editor
RequestHeaders.com
VibeHeader
HTTP Header Live
Modify Header Value (HTTP Headers)
A local-first ModHeader alternative: rewrite HTTP request & response headers via Chrome's native declarativeNetRequest. No backend, no account, no telemetry.

OpenSSL
GeoTrust SSL
Namecheap SSL Certificates
GlobalSign
Thawte SSL
SSLs
StartSSL
SSL.com is one of the most trusted certificate authorities that expands boundaries of encryption and data authentication relied upon by many worldwide users.

Which is more popular?
Based on our record, SSL.com seems to be more popular. It has been mentioned 6 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | headerflex.app | ssl.com |
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What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using HeaderFlex.app and SSL.com. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Tracking HeaderFlex.app since Aug 2026.
I currently use ssl.com for a SMIME certificate which works. Emails sent to gmail for example will show the email as signed/trusted even if it's not encrypted. Source: almost 3 years ago
It looks like they resell ssl.com and for onion there is appendix B in CA/B BR is for handling a certificate for .onion addresses. https://www.harica.gr/ sells cert for onion too. Source: over 3 years ago
I have succeeded in getting the code signing done in the Windows environment. I bought an EV cert online went through the process of signing the Mesh agent files. All is working well. However, I am finding that Apple has its own code... Source: over 3 years ago
When comparing HeaderFlex.app and SSL.com, you can also consider the following products.


OpenSSL is a free and open source software cryptography library that implements both the Secure Sockets Layer (SSL) and the Transport Layer Security (TLS) protocols, which are primarily used to provide secure communications between web browsers and …
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Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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The SSL Store™ offers 70% Off On GeoTrust SSL Certificates, including Free Site Seal. Buy GeoTrust CA SSL and get 256 bit encryption web security now.
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Add custom HTTP request headers to any site. Set Authorization tokens, override Content-Type, inject debug headers per URL pattern. declarativeNetRequest. Free: 5 rules, Pro: unlimited.
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Namecheap SSL Certificates act as a third-party verification for a website’s security.
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