
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.

Greenshot
Snagit
LightShot
FastStone Capture
PicPick
Snipping Tool
CleanShot X
ShareX is a free and open source program that lets you capture or record any area of your screen...
Which is more popular?
Based on our record, ShareX seems to be more popular. It has been mentioned 274 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | headerflex.app | getsharex.com |
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ShareX (Windows) – Tiny footprint, hot-key driven, and excellent for quick bug videos or GIFs. You’ll annotate in an external app if you need arrows or text.
ShareX — Windows-only, tiny app, hot-key everything. Perfect for testers: press a combo, capture a GIF of the bug, auto-upload it, and paste the link in under a minute.
Choosing the right free screen-recording tool boils down to your daily routine. If you work in short bursts and value instant sharing, ScreenRec is tough to beat. Need layered scenes or live streaming? OBS is waiting....
Recommendations tracked on public social media and blogs since March 2021.


Tracking HeaderFlex.app since Aug 2026.
I've been using the open source ShareX screenshot tool: https://getsharex.com/. - Source: Hacker News / 11 months ago
I made sure to document every step of the way via screenshots to ensure I could test enabling and disabling certain features. The screenshot tool I use on Windows is called, ShareX, and I find it extremely useful with regards to pointing... - Source: dev.to / about 2 years ago
I've been using ShareX (https://getsharex.com/) for some years, which is also open-source, and very featureful while not feeling too bloated, though Windows only. I'll have to have a look at this next time I'm on a Linux desktop, as I... - Source: Hacker News / over 2 years ago
When comparing HeaderFlex.app and ShareX, you can also consider the following products.


Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
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Free browser extension to modify HTTP request and response headers. No sign-up. Works on Chrome, Firefox, and Edge.
Compare modheader to HeaderFlex.app or ShareX:

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.
Compare Header Editor to HeaderFlex.app or ShareX:

The fastest way to take a customizable screenshot.
Compare LightShot to HeaderFlex.app or ShareX: