Dev tools · alternatives · 2026

24 alternatives to Blitz

Performance testing on websites, web apps & REST APIs

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. Blitz launched in 2015; newer entries below may have overtaken it.

1. 1
   Time travel debugger for web development▲681

   Automated Penetration Testing for AI-Built Apps

   2021 · replay.io · its alternatives →

2. 2IR
   Intercept.rest – Faster API debugging▲89

   Sharing an internal tool that accelerated my development work 10-fold, especially with API debugging. Thought fellow developers here might find it useful. As a developer, I often have trouble reproducing errors at the client end. https://intercept.rest lets me debug and monitor API requests and responses. It is similar to the Network tab in Chrome Developer Tools but works for any API: mobile apps, webhooks, frontend etc. After I shared it with a close circle of friends, they found it incredibly useful and even found new use cases, I never imagined. Been a long time lurker here and…

   2018 · its alternatives →

3. 3
   Website Speed Ranker▲174

   Compare how fast your website loads vs your competitors

   2015 · comingsoon.markmonitor.com · its alternatives →

4. 4
   LoadFocus▲147

   Load test your app & API's with 1000's of concurrent users.

   2015 · loadfocus.com · its alternatives →

5. 5
   Trialfire▲74

   Point and click web analytics

   2014 · trialfire.com · its alternatives →

6. 6
   API Tester▲209

   The easiest way to test APIs

   2017 · its alternatives →

7. 7
   Web Load Speed Test▲311

   Test your website load speed from 6 locations at once

   2017 · its alternatives →

8. 8
   Harness▲63

   Automated Tests For Your Web App

   2014 · harness.io · its alternatives →

9. 9
   StopLight▲94

   The easiest way to test, debug, and share your web APIs

   2014 · stoplight.io · its alternatives →

10. 10
    Image Speed Test▲218

    Analyze your website & make it faster.

    2020 · its alternatives →

11. 11
    Breakout Room for the Web ▲94

    Instant screen recording + API

    2016 · its alternatives →

12. 12
    Mention ✪ Insights Center▲168

    Measure your brand performance any way you need to 👋

    2016 · mention.com · its alternatives →

13. 13
    Optimizely▲70

    A/B testing you'll actually use

    2014 · optimizely.com · its alternatives →

14. 14
    Is my site fast enough▲147

    Monitor how fast your site is compared to your competitors

    2015 · its alternatives →

15. 15
    Speedtest Chrome extension▲123

    Measure your ISP's performance in a click

    2016 · chromewebstore.google.com · its alternatives →

16. 16
    Reqres▲131

    A hosted REST-API for testing your front-end against

    2014 · its alternatives →

17. 17
    Calibre▲64

    Comprehensive web performance monitoring

    2014 · calibreapp.com · its alternatives →

18. 18
    ApiChecker▲104

    Reliable uptime and performance monitoring for your services

    2019 · its alternatives →

19. 19
    Bouncelytics▲77

    Finding website bottlenecks just got easier

    2016 · its alternatives →

20. 20
    Runscope▲115

    Automated API Testing and Monitoring

    2014 · runscope.com · its alternatives →

21. 21
    The Question Queue▲80

    Discover the questions that can transform team performance

    2015 · its alternatives →

22. 22
    Host Server Race Track▲72

    See how fast your site loads compared to competitors

    2016 · hostingfacts.com · its alternatives →

23. 23
    WebPage Test▲8

    Website performance & optimisation test

    2016 · webpagetest.org · its alternatives →

24. 24
    Website Image Speed Test▲109

    Beautiful & easy free analysis of the images on your page

    2017 · webspeedtest.cloudinary.com · its alternatives →

Ranked by how close each launch is in meaning, then by votes. Prices were read from each product’s own site when checked and can change. Refine with your own description →