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Open-source LLM Observability for Developers

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Which is more popular?
Based on our record, Helicone AI should be more popular than Devsession. It has been mentioned 5 times since March 2021.
Website, pricing, platforms and company facts side by side.
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| Website | helicone.ai | devsession.is |
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How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using Helicone AI and Devsession. For example, how are they different and which one is better?
Recommendations tracked on public social media and blogs since March 2021.


Helicone takes the simplest possible approach to LLM monitoring: it's a proxy. Change your OpenAI base URL from api.openai.com to oai.helicone.ai, add your Helicone API key as a header, and every LLM request is logged — latency, tokens,... - Source: dev.to / 5 months ago
You're monitoring production traffic. You need Langfuse / Phoenix / Helicone / Braintrust for that. Online eval is a different problem class: implicit feedback, drift detection, hallucination rates on your data, not on HellaSwag. - Source: dev.to / 5 months ago
For many teams, especially those starting out or with simpler needs, commercial solutions like Portkey, Helicone, OpenPipe, or LiteLLM Proxy offer off-the-shelf capabilities that cover many common proxy use cases (caching, logging, cost... - Source: dev.to / 7 months ago
I will even give away the devsession.is domain (which gives you the cool: my.devsession.is/bobs-session url scheme) if I deem the effort serious and trust that it will be maintained in the long run. Source: over 4 years ago
If someone else wants to build this and maintain it as a service I will give this all the support I can. I tried (https://devsession.is/) and did not have the bandwidth. Source: over 4 years ago
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