
Avataaars Generator
Wasmer
QuickJS
Kata Containers
Lapce
Productivity Power Tools
Medium
Extism is the open source, universal plug-in system. Extend all the software everywhere! Powered by WebAssembly.
Langfuse
Helicone AI
PromptHub
LangSmith
PromptPerfect
AI Prompt Finder
AI Prompt Generator
The first platform built for prompt engineers

Which is more popular?
Based on our record, Extism seems to be a lot more popular than PromptLayer. While we know about 25 links to Extism, we've tracked only 1 mention of PromptLayer.
Website, pricing, platforms and company facts side by side.
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| Website | extism.org | promptlayer.com |
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What each product offers, as listed by its team.

No features have been listed yet.
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Prompt Engineering for Beginners - Tutorial 6 - PromptLayer
How often each product is chosen within a category, 0–100% relative to the other.

Share your experience with using Extism and PromptLayer. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.

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Developer-focused with Git-style version control. Integrates with APIs, supports team collaboration, logs AI requests, and tracks how different prompt versions perform against production code. For anyone building...
Recommendations tracked on public social media and blogs since March 2021.

Technically WASI 0.1, but I used it (via Extism[0]) to implement a simple login library[1] that works in Rust, Go, and Node. Would be trivial to add other lanugages supported by Extism. Overall I loved the dev experience. [0]:... - Source: Hacker News / 3 months ago
I tinkered with https://extism.org and basically the use case is that they suggest, namely you can extend software in another programming language but without having to setup a container or VMs on the client. They "just" run the code in... - Source: Hacker News / 3 months ago
Check out https://extism.org, it is built for those kinds of use cases. However I think WASI and components could enhance it. - Source: Hacker News / 3 months ago
Looks nice, and it's nice that it also supports function call simulation. I've been collecting a list of tools for prompt engineering, I've added Knit now. Newly added: https://promptknit.com/ Newly added:... - Source: Hacker News / about 3 years ago
When comparing Extism and PromptLayer, you can also consider the following products.


Langfuse is an open-source LLM engineering platform that helps teams collaboratively debug, analyze, and iterate on their LLM applications.
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Open-source LLM Observability for Developers
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Application and Data, Build, Test, Deploy, and JavaScript Compilers
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Test, deploy, and manage your prompts with PromptHub, a prompt management tool designed to be usable by your whole team, not just engineers.
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