Header Modifier Pro – Cheap Header Rewriter

A $19 one-time alternative to Requestly for header and redirect rewriting

Problem

Request interception and header rewriting tools like Requestly are staples for developers, but subscriptions feel expensive for people who just need to tweak a few headers. Someone already built a $19 pay-once alternative and directly compared it to Requestly, showing a clear audience that wants just-enough features without a monthly bill. Many debugging scenarios only need a simple local tool.

Solution

A minimal browser extension or local proxy: add, override, and delete request headers by domain or URL, with redirects and simple mocks, and export/import rules as shareable files. No enterprise collaboration—just a solid single-user pay-once tool.

Users

Frontend, backend, and QA engineers who frequently debug CORS, auth, or feature-flag headers

MVP

Rewrite headers by domain/URL match; support redirects and local mock responses; rule groups with toggles; export/import JSON rules; local storage, no account required

Revenue

One-time purchase ($15–29); optional team pack with multi-seat licensing

Why now

More dev tools are moving to subscriptions, fueling anti-subscription sentiment; indie devs can capture the low-price gap that big players ignore