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Entire
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Human-in-the-Loop infra for AI Agents
Langfuse
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The first platform built for prompt engineers

Which is more popular?
Based on our record, HumanLayer should be more popular than PromptLayer. It has been mentioned 2 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | humanlayer.dev | promptlayer.com |
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What each product offers, as listed by its team.
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Overall verdict
Why this product is good
Recommended for
No analysis of PromptLayer yet.
Walkthroughs and reviews on video.
HumanLayer (CodeLayer): The MOST PRODUCTIVE AI Coder 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.
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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.
Dex Horthy, CEO of HumanLayer, put a name to the pattern in his AI Engineer conference talk "No Vibes Allowed" (AI Engineer World's Fair, 2024). The Research → Plan → Implement (RPI) framework is a structured workflow for AI-assisted... - Source: dev.to / 7 months ago
I realized I needed to change my approach. While I love the iterative learning process, I needed a way to give the agent a better foundation so our pair programming sessions actually made progress. I decided to try the RPI method... - Source: dev.to / 8 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
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