--- title: "3 Best Braintrust Alternatives in 2026 (Compared)" description: "Looking for a Braintrust alternative? Compare the best LLM Observability & Evals alternatives to Braintrust by pricing, free tiers, and features — find the right fit for your startup." source: https://appstackbuilder.com/tool-alternatives/braintrust retrieved: 2026-10-07 --- LLM Observability & Evals # The 3 Best Braintrust Alternatives in 2026 Looking for an alternative to [Braintrust](https://appstackbuilder.com/tools/braintrust)? 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 Braintrust pricing Free tier available Free tier Yes Alternatives 3 compared ## Why look for a Braintrust alternative? Braintrust is a solid llm observability & evals choice, but it isn't the right fit for everyone. The most common reasons teams evaluate alternatives: * −$0 to $249 is a steep step with nothing in between * −Closed source, and only Enterprise can self-host * −Short default retention on both self-serve plans ## Braintrust vs Alternatives — Quick Comparison | Tool | Pricing | Free tier | Rating | Best for | | ------------------------------------------- | ---------------------------- | --------- | ------ | -------------------------------------------------- | | [Braintrust](https://appstackbuilder.com/tools/braintrust)You searched | Free · paid from $249/mo | ✓ | 4.6 | LLM Observability & Evals — llm, evals | | 1.[Langfuse](https://appstackbuilder.com/tools/langfuse) | Free · paid from $29/mo | ✓ | 4.7 | LLM Observability & Evals — llm, observability | | 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 Braintrust Alternatives, Explained ![Langfuse](https://www.google.com/s2/favicons?domain=langfuse.com&sz=128) ### 1. Langfuse Free tier4.7· Free · paid from $29/mo Langfuse is the most widely deployed open-source platform in this category: traces, cost and latency per call, datasets, LLM-as-judge evals and a versioned prompt registry. ClickHouse acquired it in January 2026, and the MIT licence and self-hosting path were kept. The cloud prices by units (traces, observations and scores) rather than seats. Core is $29/month for 100k units and 90 days of data, and each extra 100k units is $8\. Pro at $199 buys three years of retention rather than more volume. * ✓Genuinely open source and self-hostable * ✓Unit pricing does not punish adding teammates * ✓Framework-agnostic: OpenTelemetry, LangChain, LlamaIndex, raw SDKs [Langfuse pricing & review ](https://appstackbuilder.com/tools/langfuse)[Braintrust vs Langfuse ](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)[Braintrust vs LangSmith ](https://appstackbuilder.com/compare/braintrust-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)[Braintrust vs OpenTelemetry ](https://appstackbuilder.com/compare/braintrust-vs-opentelemetry) ## Frequently Asked Questions What are the best alternatives to Braintrust in 2026?⌄ The best Braintrust alternatives in 2026 are Langfuse, 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 Braintrust?⌄ Yes — Langfuse, LangSmith, OpenTelemetry offer free tiers, making them strong free Braintrust alternatives for bootstrapped startups. Why look for a Braintrust alternative?⌄ A common reason teams switch is $0 to $249 is a steep step with nothing in between. 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 Braintrust alternative?⌄ Langfuse is among the most affordable Braintrust alternatives — free · paid from $29/mo. Check the comparison table above for the full pricing breakdown. Which Braintrust alternative is rated highest?⌄ Langfuse is the highest-rated Braintrust alternative in our catalog at 4.7 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/)