Dev tools · alternatives · 2026

24 alternatives to RequestFlow

Turn complex REST testing scenarios into beautiful graphs

Below are 24 products that do a similar job, ranked by how close each is in meaning and then by launch-day votes. RequestFlow launched in 2021; newer entries below may have overtaken it.

1. 1
   Superflow AI▲270

   AI agents that QA your website before launch

   23d ago · usesuperflow.ai · its alternatives →

2. 2
   Upflowy▲513

   Build & A/B test beautiful web experiences in a few clicks

   2021 · its alternatives →

3. 3
   Mock API Generator▲548

   Generate custom data & API to build apps in less than 30s

   2021 · its alternatives →

4. 4DT
   Declarative Testing Framework for REST, GraphQL APIs▲45

   2018 · github.com · its alternatives →

5. 5
   A/B testing for Webflow▲161

   Test different versions of your site to improve conversions

   2024 · its alternatives →

6. 6
   Requestly▲148

   Debug & Modify HTTP(s) Requests - loved by 125K+ web devs

   2019 · its alternatives →

7. 7
   Optibase 2.0▲177

   The ultimate A/B testing app for Webflow

   2025 · optibase.io · its alternatives →

8. 8TR
   Testing REST, GraphQL APIs▲14

   2018 · github.com · its alternatives →

9. 9
   API Flow Integration Tool▲73

   Powerful tool for API flow integration, testing, prototyping

   2020 · its alternatives →

10. 10
    Request▲5

    Minimal HTTP Client for restful API development and testing.

    2022 · its alternatives →

11. 11
    FlowTest▲1

    Visual API testing that flows

    9d ago · flowtest.io · its alternatives →

12. 12
    Requestly 2.0▲112

    Intercept & modify HTTP requests

    2021 · its alternatives →

13. 13MM
    Mockoon – mock REST APIs in seconds▲68

    2017 · mockoon.com · its alternatives →

14. 14HA
    HTTPretty, an easy way to mock http requests in python▲97

    2012 · falcao.it · its alternatives →

15. 15
    Archi-Flow▲86

    Visualize cloud architecture with live traffic simulations

    May 2026 · its alternatives →

16. 16
    Mocklets▲82

    A HTTP-based API simulator to assist parallel development 🛠️

    2018 · its alternatives →

17. 17NW
    New way to test APIs with OpenAPI and Postman▲80

    2021 · github.com · its alternatives →

18. 18UR
    Use REST APIs? Test them!▲5

    2015 · dareid.github.io · its alternatives →

19. 19HA
    HTTPLang – a scripting language for making HTTP requests▲44

    2015 · github.com · its alternatives →

20. 20RI
    Restful.io – a curated list of resources for API developers▲18

    2015 · restful.io · its alternatives →

21. 21FG
    Flows – Google Colab meets Notion, designed for AI workflows▲11

    Hey HN! Pretty excited to show Flows— something that we’ve been working on for past few weeks! What is Flows? Flows lets you create multi-step AI workflows in minutes by chaining modular blocks like: - LLM calls - API calls, - Code execution - RAG - Document Parsing …and 50+ more tools. Why You'll Love Flows - Test Flows on your datasets—with thousands of rows effortlessly! - Deploy workflows to production and scale your AI applications. - Collaborate with your team or share workflows publicly. Which workflow would you build with Flows? Share your ideas below!

    2025 · app.athina.ai · its alternatives →

22. 22TR
    Testing RESTful services▲13

    2018 · medium.com · its alternatives →

23. 23RC
    Requestbin.com – A modern take on the old RequestBin▲18

    2019 · requestbin.com · its alternatives →

24. 24
    FlowTestAI▲4

    GenAI powered OpenSource IDE for API first workflows

    2024 · 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 →