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Best alternatives to Inssman: Open-Source: Modify HTTP Request (2026)

10 Chrome extensions that do a similar job to Inssman, closest first. Each shows real store users, its rating, how recently it was updated and how many permissions it asks for.

Inssman: reviews, users and permissionsBest Developer Tools extensions

Inssman: Open-Source: Modify HTTP Request today

≈5K users4.1★ from 15 ratingsNot updated for 2+ years10 permissions

Inssman alternatives, compared

  1. 1

    Requestly: Intercept & Modify HTTP Requests

    Intercept & modify HTTP(S) traffic: redirect URLs, modify headers, inject scripts, mock REST & GraphQL APIs, and more.

    ≈300K users4.7★ from 1.8K ratingsUpdated 6 weeks ago12 permissions
    • About 60× more users than Inssman
    • Updated more recently
    • Asks for more permissions (12 vs 10)
    Requestly alternativesCompare side by side
  2. 2

    Request Interceptor

    Intercept and modify network requests: headers, query params, delay, response body, custom script/CSS injection.

    ≈10K users4.2★ from 67 ratingsUpdated 3 months ago8 permissions
    • About 2.0× more users than Inssman
    • Updated more recently
    • Asks for fewer permissions (8 vs 10)
    Request Interceptor alternativesCompare side by side
  3. 3

    Modify Http Header

    Modify Http Request Or Response Header.

    ≈1K users3.8★ from 4 ratings3 permissions
    • About 5.0× fewer users than Inssman
    • Asks for fewer permissions (3 vs 10)
    Modify Http Header alternativesCompare side by side
  4. 4

    HTTP Interceptor

    Intercept and modify HTTP requests & responses: URL redirects, headers, query params, and response body replacement.

    ≈100K users5.0★ from 1 rating5 permissions
    • About 20× more users than Inssman
    • Asks for fewer permissions (5 vs 10)
    HTTP Interceptor alternativesCompare side by side
  5. 5

    tweak: mock and modify HTTP requests

    Mock or modify HTTP requests, plus a developer toolbox for any page. Test, develop and demo your web app

    ≈60K users4.5★ from 240 ratingsUpdated 3 days ago7 permissions
    • About 12× more users than Inssman
    • Updated more recently
    • Asks for fewer permissions (7 vs 10)
    tweak alternativesCompare side by side
  6. 6

    ModBox – Modify headers, block requests

    Modify HTTP headers, block assets or domains & redirect requests. Organise rules by folder and tab, optionally scope to domains.

    ≈10K users4.7★ from 15 ratingsUpdated 7 days ago3 permissions
    • About 2.0× more users than Inssman
    • Updated more recently
    • Asks for fewer permissions (3 vs 10)
    ModBox alternativesCompare side by side
  7. 7

    Mockiato: Mock API Requests in DevTools

    Intercept HTTP requests and mock responses in DevTools. Change status, body and headers. No proxy, no code changes.

    ≈5K users4.9★ from 25 ratingsUpdated 11 days ago3 permissions
    • A similar number of users to Inssman
    • Updated more recently
    • Asks for fewer permissions (3 vs 10)
    Mockiato alternativesCompare side by side
  8. 8

    Modify HTTP Headers (HTTP Header) - FlexHeader

    Add, modify & delete HTTP request/response headers with URL & regex rules. Open-source, private, no data collection

    ≈7K users4.9★ from 31 ratingsUpdated 2 months ago3 permissions
    • A similar number of users to Inssman
    • Updated more recently
    • Asks for fewer permissions (3 vs 10)
    Modify HTTP Headers (HTTP Header) alternativesCompare side by side
  9. 9

    HTTP Header Modifier

    Modify HTTP request headers for specific URLs

    ≈5K users4.5★ from 4 ratingsUpdated 6 weeks ago5 permissions
    • A similar number of users to Inssman
    • Updated more recently
    • Asks for fewer permissions (5 vs 10)
    HTTP Header Modifier alternativesCompare side by side
  10. 10

    Header Editor Pro – Modify HTTP Headers

    Modify HTTP request and response headers. Unlimited profiles, domain and tab group filters, 7 languages. Free and open source.

    ≈4K users5.0★ from 4 ratingsUpdated 4 days ago5 permissions
    • A similar number of users to Inssman
    • Updated more recently
    • Asks for fewer permissions (5 vs 10)
    Header Editor Pro alternativesCompare side by side

Inssman alternatives: questions

What is the best alternative to Inssman?

By users, the most popular alternative is Requestly: Intercept & Modify HTTP Requests with ≈300K users and a 4.7-star rating. The closest match by what it does is Requestly: Intercept & Modify HTTP Requests.

Which Inssman alternative has the best rating?

Requestly: Intercept & Modify HTTP Requests has the highest rating of these alternatives with 50+ ratings: 4.7 out of 5 from 1.8K ratings.

Is there a Inssman alternative that asks for fewer permissions?

Modify Http Header asks for 3 permissions, against 10 for Inssman.

How many alternatives to Inssman are there?

We list 10 close alternatives to Inssman on the Chrome Web Store, picked by what they do and ranked by how close they are.

Users and ratings are the figures shown on the Chrome Web Store, re-checked continuously. Alternatives are matched on name, description, category and topic. Browse best-of lists by niche.