Helicone vs PromptLayer

Helicone

Evaluation

PromptLayer

Evaluation

Tagline

Helicone

Open-source LLM observability — one-line proxy install.

PromptLayer

Lightweight prompt logging + management for OpenAI/Claude apps.

Pricing

Helicone

Freemium· Free 100k req/mo; Pro from $25/mo

PromptLayer

Freemium· Free: $0 · Pro: $49 · Team: $500 · Enterprise: Custom

Lowest paid tier

Helicone

—

PromptLayer

$49 · Pro

captured 2026-08-06

Platforms

Helicone

api

PromptLayer

api

Model used

Helicone

Platform (any LLM)

PromptLayer

Platform (any LLM)

Best for

Helicone

Pick Helicone when you want one-line LLM observability with no integration work.

PromptLayer

Pick PromptLayer when you want prompt logging + light versioning without committing to a heavier eval platform.

Not for

Helicone

Skip it when you need deep eval datasets or your workload can't tolerate a proxy hop.

PromptLayer

Skip it when you need deep eval datasets, multi-step tracing, or production monitoring.

Editorial score

Helicone

8.3 / 10

PromptLayer

7.9 / 10

Use cases

Helicone

observabilitycost trackingopen source

PromptLayer

prompt loggingversioningsmall teams

Pros

Helicone

• One-line install
• Open source
• Generous free tier
• Cost tracking is genuinely useful

PromptLayer

• Easiest to drop in
• Good free tier
• Decent prompt versioning
• Affordable Pro tier

Cons

Helicone

• Eval features less deep than Braintrust
• Proxy adds a hop

PromptLayer

• Eval/dataset features less deep than Braintrust
• Less observability

Website

Helicone

www.helicone.ai

PromptLayer

www.promptlayer.com

Editorial score: rule-based, 0–10, from AI-assisted profile inputs (see /methodology) — not a user rating; “—” means unscored. “Not listed” means we have no record of it, not that it is absent. GitHub figures and prices carry the date they were checked or captured; prices are shown as published, unconverted.