
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.

Mockuuups Studio
Smartmockups
Mediamodifier
Canva
Dimmy.Club
Magic Mockups
Mockups Design
Generate realistic product shots in seconds

Which is more popular?
Based on our record, Placeit seems to be more popular. It has been mentioned 46 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | headerflex.app | placeit.net |
| Pricing | — | |
| Company | — | Startup from Mexico |
| Listed in |
What each product offers, as listed by its team.


Possible disadvantages
Possible disadvantages
An editorial look at what each product does well and who it suits.


No analysis of HeaderFlex.app yet.
Overall verdict
Why this product is good
Recommended for
Small business owners, marketers, social media managers, freelancers, and content creators who require high-quality visual assets with minimal effort and investment.
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using HeaderFlex.app and Placeit. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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With nearly 3000 mockup templates, Placeit has it all. iPhones, Samsungs, desktops, laptops, tablets, you name it, they've got it, and in nearly every position imaginable!
Recommendations tracked on public social media and blogs since March 2021.


Tracking HeaderFlex.app since Aug 2026.
Placeit: Offers mockups and templates that can be tailored to specific locations. - Source: dev.to / about 2 years ago
Placeit.net - This is probably the best one on mock-up generation imo. It has many many real-life mock-ups to choose from. (One of my favorites). Source: over 3 years ago
It's mockup, you can use mockup generator like placeit.net and many others. Source: over 3 years ago
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Fast and easy way to create product mockups on macOS, Windows and Linux.
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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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Create stunning product mockups, easily and online.
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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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Create beautiful designs and product mockups in seconds.
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