
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.

jQuery
React Native
Babel
Composer
Raven.js
Symfony
jQuery UI
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 …

Which is more popular?
Based on our record, OpenSSL seems to be more popular. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | headerflex.app | openssl.org |
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Das Kommando "enc" in OpenSSL
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Share your experience with using HeaderFlex.app and OpenSSL. 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.
Baserow uses open source like https://en.wikipedia.org/wiki/OpenSSL and can use it without handing over data to openssl.org. Source: about 4 years ago
Noob here; I'm looking at openssl.org Two commands are listed; "openssl-genrsa" and "openssl genrsa" (No hyphen). Source: over 4 years ago
When comparing HeaderFlex.app and OpenSSL, you can also consider the following products.


Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
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A framework for building native apps with React
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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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Babel is a compiler for writing next generation JavaScript.
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