--- title: "3 Best LangSmith Alternatives in 2026 (Compared)" description: "Looking for a LangSmith alternative? Compare the best LLM Observability & Evals alternatives to LangSmith by pricing, free tiers, and features — find the right fit for your startup." source: https://appstackbuilder.com/tool-alternatives/langsmith retrieved: 2026-10-07 --- LLM Observability & Evals # The 3 Best LangSmith Alternatives in 2026 Looking for an alternative to [LangSmith](https://appstackbuilder.com/tools/langsmith)? 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 LangSmith pricing Free tier available Free tier Yes Alternatives 3 compared ## Why look for a LangSmith alternative? LangSmith is a solid llm observability & evals choice, but it isn't the right fit for everyone. The most common reasons teams evaluate alternatives: * −Per-seat and per-trace pricing both scale with you * −Trace pricing has changed repeatedly, so budgets drift * −Self-hosting requires an Enterprise contract ## LangSmith vs Alternatives — Quick Comparison | Tool | Pricing | Free tier | Rating | Best for | | ----------------------------------------- | ---------------------------- | --------- | ------ | -------------------------------------------------- | | [LangSmith](https://appstackbuilder.com/tools/langsmith)You searched | Free · paid from $39/seat/mo | ✓ | 4.5 | LLM Observability & Evals — llm, observability | | 1.[Langfuse](https://appstackbuilder.com/tools/langfuse) | Free · paid from $29/mo | ✓ | 4.7 | LLM Observability & Evals — llm, observability | | 2.[Braintrust](https://appstackbuilder.com/tools/braintrust) | Free · paid from $249/mo | ✓ | 4.6 | LLM Observability & Evals — llm, evals | | 3.[OpenTelemetry](https://appstackbuilder.com/tools/opentelemetry) | Free | ✓ | 4.6 | LLM Observability & Evals — observability, tracing | ## Top LangSmith 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)[LangSmith vs Langfuse ](https://appstackbuilder.com/compare/langfuse-vs-langsmith) ![Braintrust](https://www.google.com/s2/favicons?domain=braintrust.dev&sz=128) ### 2. 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)[LangSmith vs Braintrust ](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)[LangSmith vs OpenTelemetry ](https://appstackbuilder.com/compare/langsmith-vs-opentelemetry) ## Frequently Asked Questions What are the best alternatives to LangSmith in 2026?⌄ The best LangSmith alternatives in 2026 are Langfuse, Braintrust, 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 LangSmith?⌄ Yes — Langfuse, Braintrust, OpenTelemetry offer free tiers, making them strong free LangSmith alternatives for bootstrapped startups. Why look for a LangSmith alternative?⌄ A common reason teams switch is per-seat and per-trace pricing both scale with you. 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 LangSmith alternative?⌄ Langfuse is among the most affordable LangSmith alternatives — free · paid from $29/mo. Check the comparison table above for the full pricing breakdown. Which LangSmith alternative is rated highest?⌄ Langfuse is the highest-rated LangSmith 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/)