JSON Placeholder
JSON Server
mocki Fake JSON API
httpbin(1)
MockRest
Nacapi
Format JSON Online
A hosted REST-API ready to respond to your AJAX requests.

Langfuse
Helicone AI
LangChain
Portkey
Braintrust
Braintrust.dev
Arize Phoenix
Build and deploy LLM applications with confidence

Which is more popular?
Based on our record, ReqRes seems to be more popular. It has been mentioned 21 times since March 2021.
Website, pricing, platforms and company facts side by side.
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ReqRes
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| Website | reqres.in | langchain.com |
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What each product offers, as listed by its team.

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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.
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🦜🛠️ Getting started with LangSmith - Integrating with LANGCHAIN powered Web Applications & Chatbots
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Share your experience with using ReqRes and LangSmith. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.

Https://reqres.in/ - roughly that much in ads revenue. Would love to add a paid plan for more features, but....time. - Source: Hacker News / almost 2 years ago
Reqres.in - A Free hosted REST-API ready to respond to your AJAX requests. - Source: dev.to / over 2 years ago
As stated earlier we are using the REQ | RES API in the example, you can check it out to see all the methods it provides. Now, go to the core/internet_services/ create a dart file and name it paths.dart, this will contain the baseurl and... - Source: dev.to / over 3 years ago
Tracking LangSmith since Jul 2023.
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