LangSmith VS Requestly

Compare LangSmith VS Requestly and see what are their differences

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LangSmith

Build and deploy LLM applications with confidence

Requestly

A Powerful API Mocking and Testing Tool

Landing page //
2023-10-21

Requestly //
2025-02-12
Rest Client //
2025-02-12
HTTP Interceptor //
2025-02-12
API Mocking //
2025-02-12
Requestly //
2025-02-12

Requestly is a modern and powerful companion for API Development and Testing. It is an open-source tool purpose-built to speed up and simplify API development workflow for developers and QAs. It is a combination of API Client and HTTP Interceptor that helps create and share API Contracts, testing APIs, and easily mock and integrate them into web and mobile apps.

LangSmith

Website: langchain.com
Pricing URL: -
$ Details: -
Platforms: -
Release Date: -

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Requestly

Website: requestly.com
Pricing URL: Official Requestly Pricing
$ Details: freemium
Platforms: Google Chrome Firefox Edge Safari Brave Opera Vivaldi Android Windows Linux Mac OSX MacOS
Release Date: 2021 January
Startup details
Country: United States
State: California
City: San Francisco
Founder(s): Sachin Jain, Sagar Soni, Sahil Gupta
Employees: 20 - 49

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LangSmith features and specs

Enhanced Workflow Integration
LangSmith provides seamless integration with existing workflows, allowing for a streamlined process when incorporating language models into various applications.
User-Friendly Interface
The platform features an intuitive and user-friendly interface, making it accessible for both technical and non-technical users to navigate and utilize effectively.
Advanced Language Model Support
LangSmith offers support for a wide range of advanced language models, enabling users to choose the best fit for their specific needs.
Comprehensive Analytics
Users have access to comprehensive analytics tools that allow for detailed monitoring and evaluation of language model performance.

Possible disadvantages of LangSmith

Cost Considerations
Depending on the scale and frequency of use, LangSmith can become costly, potentially making it less accessible for smaller organizations or individual developers.
Learning Curve
While user-friendly, mastering all features of LangSmith may require some time and effort, especially for users who are less experienced with language models.
Limited Customization
Some users might find the customization options for certain aspects of the platform to be limited compared to building a solution in-house.
Dependency on Internet Connectivity
LangSmith, being a cloud-based service, relies heavily on a stable internet connection, which can be a limitation in regions with poor connectivity.

Requestly features and specs

Redirect URL
Block Network Requests
Modify Request & Response Header
Modify Response
Supercharge Selenium
Session Replay
Modify Query Params
Team Workspace
API Client
API Mocks
GraphQL Support
Zero Setup
Auto Capture Sessions
Network Logs
Console Logs

Analysis of LangSmith

Overall verdict

LangSmith is a valuable tool for developers working in the field of natural language processing or any project involving language models. Its comprehensive toolset for managing and optimizing interactions with LLMs provides a significant advantage, enhancing both productivity and the quality of applications built with it.

Why this product is good

LangSmith, the platform from LangChain, offers a suite of tools and features that facilitate building applications powered by language models. It provides capabilities like prompt management, evaluation, and debugging, which are essential for developers working with LLMs. These features make it easier to manage, refine, and optimize the performance of language model applications.

Recommended for

LangSmith is recommended for AI developers, machine learning engineers, and businesses aiming to build, test, and optimize applications based on language models. It is particularly useful for teams that require robust evaluation tools and a streamlined process for managing and deploying language-driven applications.

Analysis of Requestly

Overall verdict

Requestly is generally regarded as a good tool due to its comprehensive functionalities and ease of use. Its ability to seamlessly manage network requests makes it suitable for both beginners and experienced developers.

Why this product is good

Requestly is widely considered a valuable tool because it offers robust and flexible features for intercepting and modifying network requests. Developers and QA testers appreciate it for its ability to simulate and debug API calls efficiently. It is particularly useful for testing changes without altering the codebase and for working with web applications in development and production environments.

Recommended for

Developers looking to debug and test API endpoints.
Quality Assurance (QA) teams that require reliable testing tools for web applications.
Technical professionals who manage network traffic and need to modify or redirect requests effortlessly.
Anyone involved in web development who needs to simulate network conditions or test application behavior under different scenarios.

LangSmith videos

+ Add

🦜🛠️ Getting started with LangSmith - Integrating with LANGCHAIN powered Web Applications & Chatbots

Requestly videos

+ Add

Get Started with Requestly

Category Popularity

0-100% (relative to LangSmith and Requestly)

LangSmith

Requestly

100 100%

0% 0

Developer Tools

39 39%

Developer Tools

61% 61

Testing

0 0%

Testing

100% 100

Productivity

100 100%

Productivity

0% 0

Questions & Answers

As answered by people managing LangSmith and Requestly.

Who are some of the biggest customers of your product?

Requestly's answer:

Verizon
AT&T
Adobe
Salesforce
Telegraph
Intuit
Verizon

How would you describe the primary audience of your product?

Requestly's answer:

Front-end developers, QAs, PMs, Digital Marketers

What makes your product unique?

Requestly's answer:

Requestly is an open-source API development and testing tool that combines the capabilities of an API Client and HTTP Interceptor, making it a better alternative to Postman + Charles Proxy. It simplifies API mocking, request modification, and debugging with an intuitive no-code interface, enabling developers and QAs to test APIs efficiently.

User comments

Share your experience with using LangSmith and Requestly. For example, how are they different and which one is better?

Reviews

These are some of the external sources and on-site user reviews we've used to compare LangSmith and Requestly

LangSmith Reviews

We have no reviews of LangSmith yet.
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Requestly Reviews

Comparing Charles Proxy, Fiddler, Wireshark, and Requestly

On the pricing front, Requestly strikes a balance between affordability and functionality. It is an open-source tool, offering freemium to individual developers and affordable pricing plans for team collaboration. We have also clearly differentiated how Requestly differs from Wireshark and other web debugging tools like Proxyman, Modheader, and HTTP ToolKit separately.

Source: dev.to

Social recommendations and mentions

Based on our record, Requestly seems to be more popular. It has been mentiond 35 times since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.

LangSmith mentions (0)

We have not tracked any mentions of LangSmith yet. Tracking of LangSmith recommendations started around Jul 2023.

Requestly mentions (35)

Why You Need a Local-First API Client (With Hands-On Example)
If you want to try a local-first workflow, you can start using Requestly here: https://requestly.com. - Source: dev.to / 8 months ago
How to use Cursor to Generate API Testcases in Requestly
That’s where automation changes the game. By pairing Cursor, an AI-powered coding assistant, with Requestly's local-first API testing and mocking platform, you can offload the grunt work of writing tests to AI while keeping execution secure and reproducible on your own system. In this article, we’ll walk through how to set up Cursor with Requestly, generate test cases automatically, and run them end-to-end so that... - Source: dev.to / 8 months ago
These 20 Awesome API Clients Will Change How You Work with APIs
Requestly is a versatile browser extension and web client used to intercept, mock, and debug APIs in real-time—perfect for frontend developers. - Source: dev.to / about 1 year ago
Best Tools for GraphQL Development in 2025
Requestly is a powerful tool for modifying GraphQL responses, intercepting requests, and debugging API interactions. It allows developers to tweak request bodies, capture GraphQL traffic, and share sessions for easier debugging and collaboration. - Source: dev.to / over 1 year ago
How Not to Use AI in Software Development
Learn more at https://requestly.com/. - Source: dev.to / over 1 year ago

What are some alternatives?

When comparing LangSmith and Requestly, you can also consider the following products

Langfuse - Langfuse is an open-source LLM engineering platform that helps teams collaboratively debug, analyze, and iterate on their LLM applications.

Postman - The Collaboration Platform for API Development

Helicone AI - Open-source LLM Observability for Developers

Proxyman.io - Proxyman is a high-performance macOS app, which enables developers to view HTTP/HTTPS requests from apps and domains.

LangChain - Framework for building applications with LLMs through composability

ngrok - ngrok enables secure introspectable tunnels to localhost webhook development tool and debugging tool.

Langfuse vs LangSmith

Langfuse vs Requestly

Postman vs LangSmith

Postman vs Requestly

Helicone AI vs LangSmith

Helicone AI vs Requestly

Proxyman.io vs LangSmith