--- title: "3 Best Langfuse Alternatives in 2026 (Compared)" description: "Looking for a Langfuse alternative? Compare the best LLM Observability & Evals alternatives to Langfuse by pricing, free tiers, and features — find the right fit for your startup." source: https://appstackbuilder.com/tool-alternatives/langfuse retrieved: 2026-10-07 --- LLM Observability & Evals # The 3 Best Langfuse Alternatives in 2026 Looking for an alternative to [Langfuse](https://appstackbuilder.com/tools/langfuse)? Below we compare the best llm observability & evals alternatives by pricing, free tiers, and what each is best for — so you can pick the right fit for your budget and stack. Category LLM Observability & Evals Langfuse pricing Free tier available Free tier Yes Alternatives 3 compared ## Why look for a Langfuse alternative? Langfuse is a solid llm observability & evals choice, but it isn't the right fit for everyone. The most common reasons teams evaluate alternatives: * −Self-hosting at scale means running ClickHouse, Postgres and Redis * −Units add up quickly for agent traces with many spans * −Longer retention is gated behind the $199 plan ## Langfuse vs Alternatives — Quick Comparison | Tool | Pricing | Free tier | Rating | Best for | | --------------------------------------- | ---------------------------- | --------- | ------ | -------------------------------------------------- | | [Langfuse](https://appstackbuilder.com/tools/langfuse)You searched | Free · paid from $29/mo | ✓ | 4.7 | LLM Observability & Evals — llm, observability | | 1.[Braintrust](https://appstackbuilder.com/tools/braintrust) | Free · paid from $249/mo | ✓ | 4.6 | LLM Observability & Evals — llm, evals | | 2.[LangSmith](https://appstackbuilder.com/tools/langsmith) | Free · paid from $39/seat/mo | ✓ | 4.5 | LLM Observability & Evals — llm, observability | | 3.[OpenTelemetry](https://appstackbuilder.com/tools/opentelemetry) | Free | ✓ | 4.6 | LLM Observability & Evals — observability, tracing | ## Top Langfuse Alternatives, Explained ![Braintrust](https://www.google.com/s2/favicons?domain=braintrust.dev&sz=128) ### 1. Braintrust Free tier4.6· Free · paid from $249/mo Braintrust starts from evaluation rather than tracing: experiments, datasets, scorers and a playground for comparing prompts and models side by side, with production logging on the same data. Every plan has unlimited users. The free Starter plan includes 1 GB of processed data and 10k scores with 14-day retention. Pro is $249/month for 5 GB and 50k scores, then $3/GB and $1.50 per 1,000 scores, and qualifying startups can get 6–12 months of Pro free. It is closed source; there is no self-hosted tier below Enterprise. * ✓Strongest eval and experiment workflow in the category * ✓Unlimited users, so PMs and domain experts can review outputs * ✓Generous startup program [Braintrust pricing & review ](https://appstackbuilder.com/tools/braintrust)[Langfuse vs Braintrust ](https://appstackbuilder.com/compare/braintrust-vs-langfuse) ![LangSmith](https://www.google.com/s2/favicons?domain=langchain.com&sz=128) ### 2. LangSmith Free tier4.5· Free · paid from $39/seat/mo LangSmith comes from the team behind LangChain and LangGraph, and it shows: agent graphs, tool calls and state transitions render without extra instrumentation, and it now ingests OpenTelemetry for everything else. The free Developer plan is one seat with 5,000 base traces a month. Plus is $39 per seat with 10,000 traces and pay-as-you-go above that. Base traces keep 14 days; 180-day extended retention costs more per trace. LangChain has repriced traces more than once in 2026, so model your volume in its calculator. Self-hosting is an Enterprise option. * ✓Best-in-class visibility into LangGraph and LangChain agents * ✓Mature evals, datasets and annotation queues * ✓Accepts OpenTelemetry traces from non-LangChain code [LangSmith pricing & review ](https://appstackbuilder.com/tools/langsmith)[Langfuse vs LangSmith ](https://appstackbuilder.com/compare/langfuse-vs-langsmith) ![OpenTelemetry](https://www.google.com/s2/favicons?domain=opentelemetry.io&sz=128) ### 3. OpenTelemetry Free tier4.6· Free OpenTelemetry is not a dashboard. It is the CNCF standard, SDKs and Collector that decide what a trace looks like and where it gets sent. Its GenAI semantic conventions now live in their own repository and cover spans, metrics and events for model clients, MCP and provider-specific calls (OpenAI, Anthropic, Bedrock, Azure AI). Instrument once with OTel and the traces can go to Langfuse, LangSmith, Braintrust or a Grafana stack you run yourself. That is why it belongs on this list: it is how you avoid getting locked into any of them. * ✓No vendor lock-in: switch backends without re-instrumenting * ✓One trace spans your API, database and model calls * ✓Every serious observability vendor accepts OTLP [OpenTelemetry pricing & review ](https://appstackbuilder.com/tools/opentelemetry)[Langfuse vs OpenTelemetry ](https://appstackbuilder.com/compare/langfuse-vs-opentelemetry) ## Frequently Asked Questions What are the best alternatives to Langfuse in 2026?⌄ The best Langfuse alternatives in 2026 are Braintrust, LangSmith, OpenTelemetry. Each is a llm observability & evals option you can compare on pricing, free tiers, and features in the table above. Is there a free alternative to Langfuse?⌄ Yes — Braintrust, LangSmith, OpenTelemetry offer free tiers, making them strong free Langfuse alternatives for bootstrapped startups. Why look for a Langfuse alternative?⌄ A common reason teams switch is self-hosting at scale means running clickhouse, postgres and redis. Beyond that, people compare llm observability & evals tools on pricing, specific feature gaps, ease of use, and whether an open-source or free-tier option exists — so they can pick the best fit for their stack and budget. What is the cheapest Langfuse alternative?⌄ Braintrust is among the most affordable Langfuse alternatives — free · paid from $249/mo. Check the comparison table above for the full pricing breakdown. Which Langfuse alternative is rated highest?⌄ Braintrust is the highest-rated Langfuse alternative in our catalog at 4.6 out of 5, making it a strong pick if you want a well-reviewed option. ## Find your perfect llm observability & evals tool Skip the research. Get a free AI-powered tech stack matched to your budget, app type, and team size in seconds. [Build my stack free ](https://appstackbuilder.com/)