LLM cost without framework lock-in
LangSmith is built for LangChain — and charges by developer seat. LLMeter works with any HTTP client, never sees your prompts, and ships flat pricing. Set up in 30 seconds.
No credit card required. Free plan never expires.
Why teams move off LangSmith for cost
LangSmith is excellent for tracing, eval, and prompt management. As a pure cost-monitoring tool, the model has trade-offs.
Per-seat pricing
LangSmith Plus is per-developer. A growing team pays more for the same cost data. LLMeter is flat-tier — your bill doesn't track headcount.
LangChain coupling
The best LangSmith UX assumes you're on LangChain. If you use raw OpenAI SDK, custom HTTP, or LlamaIndex, you're second-class. LLMeter is framework-agnostic by design.
Tracing sees prompts
LangSmith's tracing model captures prompts and completions by default. LLMeter only reads billing data — your prompts never leave your stack.
Migrate in 3 steps
No SDK install. No tracing config. Your LangChain code keeps running.
Sign up for LLMeter
Create a free account. No credit card. No team-size minimum.
Paste a read-only API key
Generate read-only keys for OpenAI/Anthropic/DeepSeek and paste them. LLMeter pulls usage data — your LangChain stack stays exactly as it is.
Disable LangSmith tracing
Remove LANGCHAIN_TRACING_V2 env vars and the @traceable decorators if you only used them for cost. Your LangChain code keeps running, just without sending traces to LangSmith.
LangSmith vs LLMeter
For cost monitoring specifically — the comparison most teams care about.
| Feature | LangSmith | LLMeter |
|---|---|---|
| Framework dependency | LangChain-first (best UX with LC) | None — works with any HTTP client |
| Pricing model | Per developer seat | Flat tier (Free / $19 / $49) |
| Setup method | SDK + LANGCHAIN_TRACING env vars | Read-only API key (no code changes) |
| Time to first dashboard | ~10 min (SDK install + tracing) | 30 seconds |
| Open source | No (server is closed) | Yes (AGPL-3.0) |
| Self-hosting | Enterprise tier only | Free for everyone |
| Multi-provider support | Whatever LangChain supports | OpenAI, Anthropic, DeepSeek, OpenRouter |
| Per-customer cost attribution | Custom metadata (manual) | Built-in |
| Trace/eval features | Yes (full LLMOps suite) | No (cost-focused, on purpose) |
| Prompt/data access | Sees all prompts via SDK | Never sees prompts |
Pricing comparison: LangSmith Plus $39/dev/month (Apr 2026 pricing). LLMeter Team $49/mo flat.
Migration FAQ
Is LLMeter a full LangSmith replacement?
For cost monitoring, yes. For prompt evaluation, dataset management, and agent debugging — no. LLMeter is intentionally focused on the cost layer. If you use LangSmith primarily for "how much am I spending and where," LLMeter replaces it cleanly. If you use it for prompt regression testing or eval suites, keep LangSmith for those and pair with LLMeter for cost.
Does LLMeter require LangChain?
No. LLMeter doesn't care which framework (or no framework) you use. It reads usage data from each provider's billing/usage API via read-only keys. OpenAI raw, Anthropic raw, LangChain, LlamaIndex, custom HTTP — all work the same.
Why move off LangSmith for cost monitoring?
Three common reasons we hear: (1) per-developer-seat pricing penalizes growing teams even when LLM usage stays flat, (2) you want cost visibility without committing to LangChain or maintaining @traceable wrappers, (3) you want a tool that doesn't see your prompts or completions for compliance reasons.
Can LLMeter see my prompts or completions?
No. LLMeter only reads usage and billing data. The provider's read-only API doesn't expose prompt content, and LLMeter never proxies your live calls. LangSmith's tracing model captures prompts and outputs by design — LLMeter's doesn't.
How does pricing compare for a 5-dev team?
LangSmith Plus is currently $39/dev/month — a 5-dev team pays $195/mo. LLMeter Team is $49/mo flat for the same 5 devs (and 50 more if you grow). The savings compound as the team grows; the cost-monitoring need does not scale with headcount.
Is LLMeter open source?
Yes. AGPL-3.0. You can self-host the entire thing on your infra at no cost — LangSmith's self-hosting is enterprise-tier only.
Cost monitoring shouldn't scale with headcount.
Free for 1 provider, forever. $19/mo for unlimited. $49/mo for the whole team. No per-seat math, no LangChain lock-in.
No credit card required. Free plan never expires.