Product
API Client

A lightweight and secure API Client for faster API Development & Testing

HTTP Interceptor

A Powerful HTTP Interceptor to Intercept, Record, Debug & Modify HTTP Requests

API Mocking

Build frontend faster without waiting for backend.

Use Case
Frontend Web/Mobile Developers

Requestly improves front-end workflows with local JS testing, mocking, and SessionBook debugging.

For QA engineers

QA engineers love Requestly for its features and ease of use, allowing easy edge case testing.

Support Engineer

Support engineers value Requestly for debugging, demoing, and overriding GTM and Adobe scripts.

Backend Developers

Requestly helps in improving back-end development workflows, by enabling testing.

Requestly vs Postman
Resources
Pricing
Blog
Case Studies
Status
Github
Release Note
Student Programme

📣 Requestly API Client – Free Forever & Open Source. A powerful alternative to Postman. Try now ->

How to Simulate Different Devices Using User-Agent

Kanishk Rawat
September 9, 2024
1MIN READ
Learn how to simulate different devices using User-Agent in Requestly for accurate website testing without affecting live data.
User-agent

Introduction

Testing websites across various devices can be resource intensive and time consuming, especially when dealing with mobile specific issues. The complexity of simulating different devices often slows down development and debugging.

Requestly streamlines this process by allowing you to modify user-agent, making it easier to simulate various devices and efficiently troubleshoot mobile-specific issues.

How to Simulate Different Devices

The User-Agent Rule in Requestly allows you to adjust user-agent strings to simulate different devices, rather than relying on actual hardware. This is particularly useful for testing how your site performs across various devices in a controlled environment, ensuring accurate results without needing physical devices.

user-agent
  • Options: You can select different parameters such as Device, Browser, or Custom conditions to modify how requests are handled.
  • Agent: Choose the device type or user agent that the request should simulate. In this example, android phone is selected to mimic requests from an Android device.
  • Source Condition: This allows you to set up specific conditions, such as URL patterns, to target particular domains or requests. For example, the URL is set to example.com.
  • Test URL Condition: You can check if the rules you’ve set up work correctly by testing them on specific URLs.
  • Filter Out Condition: You can apply filters to limit which requests are affected, making sure only the ones you want are modified.
    Install Requestly Browser Extension if not installed already
    Try This Rule

    Or create your own Rule by following the steps below

    Here’s how to set up a rule to simulate different devices using User-Agent in Requestly:

    1. Open Requestly:Open Requestly app.
    2. Create a New Rule: Click on New Rule and select the User-Agent Rule option.
    3. Enter the URL Pattern: Define the URL condition for which the rule should apply.
    4. Choose Device User-Agent: Select the User-Agent string that corresponds to the device you want to simulate, such as Android or iPhone.
    5. Save the Rule: Click Save to apply the rule.

    Interactive Guide

    Check this interactive and easy explanation of how to create  User-Agent rule.

    Conclusion

    Try this User-Agent rule to simulate different devices, ensuring accurate testing without affecting live data. Requestly is trusted by over 200k developers and 1000+ companies for its efficient network request management.

    Explore More:

    Written by
    Kanishk Rawat
    Kanishk Rawat, a tech enthusiast since childhood, has mastered programming through dedication. Whether solo or in a team, he thrives on challenges, crafting innovative solutions .

    Related posts

    Endpoint ft. Kushagra Gour: A Builder’s Philosophy on Craft and Empathy
    In the world of technology, some leaders don’t just follow trends—they define them. They are the builders and thinkers, grounded in real-world experience, whose insights push the industry forward. To celebrate their work and bring their hard-won wisdom to the community, we’re proud to introduce Endpoint—a series by Requestly spotlighting the leaders shaping the future of software.
    Kanishk Rawat
    November 3, 2025
    1xx HTTP Status Codes: Informational Responses
    Explore 1xx informational HTTP status codes and their role in communicating request progress between client and server.
    Azma Banu
    November 3, 2025
    Mock APIs with Pagination: Types, Steps, and Best Practices
    Learn how to mock APIs with pagination in a step-by-step guide that covers setup, pagination formats, and structured methods for effective API simulation.
    Rohit Rajpal
    October 31, 2025