Compare 7 free alternatives to LangSmith for AI / ML. Every one of their free tier limits side by side, with the read and catalogue dates we hold.

AgentDeals › Alternatives › LangSmith

Best LangSmith Alternatives with Free Tiers (2026)

7 free alternatives in AI / ML. Sorted by pricing stability.

Current LangSmith Situation

Risk Level: source unconfirmed
Why: The only record that would rate LangSmith is a change we could not check against an archived copy of LangSmith's page, so we are not publishing a rating for it. We are not publishing a stability judgement for it until that is fixed.
Category: AI / ML
Pricing Page: www.langchain.com/pricing

Recent Pricing Changes (1)

model change discovered 2026-09-01 · effective date unknown high impact
The free tier now includes pay-as-you-go pricing for traces beyond 5k/month, and introduces LCUs and LSUs for additional costs related to compute and storage. Unconfirmed. We could not check this change against an archived copy of LangSmith's page, so it does not count toward the rating. Source ↗

All Free Alternatives (7)

5 of these carry no recorded demerit and are indistinguishable under every signal we hold; their order rotates daily. 2 are demoted with the reason named, and 0 are listed last because they are not generally available or are not a free offer. How we rank.

Left out of this list: Hugging Face (shares no subtype with this product), Groq (shares no subtype with this product), Google Gemini API (shares no subtype with this product), Mistral AI (shares no subtype with this product), OpenRouter (shares no subtype with this product), Cloudflare Workers AI (shares no subtype with this product), Cerebras (shares no subtype with this product), Cohere (shares no subtype with this product), Brave Search API (shares no subtype with this product), OpenAI (shares no subtype with this product), Pinecone (shares no subtype with this product), Qdrant (shares no subtype with this product), Deepgram (shares no subtype with this product), Kaggle (shares no subtype with this product), Roboflow (shares no subtype with this product), Scale AI (shares no subtype with this product), AssemblyAI (shares no subtype with this product), Replicate (shares no subtype with this product), Baseten (shares no subtype with this product), Weights & Biases (shares no subtype with this product), Clarifai (we have not classified this record), Neptune.ai (we have not classified this record), Labelbox (shares no subtype with this product), Google Colab (shares no subtype with this product), Composio (shares no subtype with this product), DeepAR (none of this category's subtypes apply), Maxim AI (shares no subtype with this product), OCR.Space (shares no subtype with this product), Parseur (shares no subtype with this product), Reducto (shares no subtype with this product), SerpApi (shares no subtype with this product), Tavily AI (shares no subtype with this product), paperspace (shares no subtype with this product), Audio Enhancer (none of this category's subtypes apply), Clair (none of this category's subtypes apply), Langtrace (we have not classified this record), Lumenfall.ai (shares no subtype with this product), Mediaworkbench.ai (none of this category's subtypes apply), Othor AI (none of this category's subtypes apply), Pollinations.AI (shares no subtype with this product), ReportGPT (none of this category's subtypes apply), Zenable (none of this category's subtypes apply), xAI (shares no subtype with this product), Anthropic API (shares no subtype with this product), GitHub Models (shares no subtype with this product), NVIDIA NIM (shares no subtype with this product), Ollama Cloud (shares no subtype with this product), LLM7.io (shares no subtype with this product), SiliconFlow (shares no subtype with this product), Zhipu AI (shares no subtype with this product), DeepSeek API (shares no subtype with this product), MiniMax (shares no subtype with this product), Exa (shares no subtype with this product), GPU-Bridge (we have not classified this record), Google Vertex AI Agent Engine (we have not classified this record), Google Vector Search 2.0 (shares no subtype with this product), Google Gemini Embedding 2 (shares no subtype with this product), Alibaba Cloud Qwen Code (none of this category's subtypes apply), E2B (shares no subtype with this product), Together AI (shares no subtype with this product), Fireworks AI (shares no subtype with this product), Modal (shares no subtype with this product), ElevenLabs (we have not classified this record), Stability AI (we have not classified this record), Daytona (shares no subtype with this product), Blaxel (shares no subtype with this product), Novita Sandbox (shares no subtype with this product), Runloop (shares no subtype with this product), Mem0 (shares no subtype with this product), Zep (shares no subtype with this product), Letta (we have not classified this record), Supermemory (shares no subtype with this product), Cognee (shares no subtype with this product), Serper (shares no subtype with this product), Linkup (shares no subtype with this product), Parallel (shares no subtype with this product), Jina AI (shares no subtype with this product), You.com (shares no subtype with this product), Hetzner Inference API (shares no subtype with this product), Cloudflare AI Search (we have not classified this record), Valyu (shares no subtype with this product). Each is still listed in its category, with the vendor's own words we read that from on its page. How we decide this.

Keywords AI
Free
Rebranded to Respan; keywordsai.co redirects to respan.ai. Free plan: full platform, 100k logs, 1k scores, 5 datasets, 2 evaluators, 5 prompts.
AI / ML Read and confirmed 2026-10-06 · tried again 2026-10-31 and did not read the page
Profile
Braintrust stable
Free
Evals, prompt playground, and data management for Gen AI. Starter plan (free): 1 GB processed data/month, 10k scores/month, 14 days data retention.
AI / ML Read and confirmed 2026-11-06
Profile
Arize AX
Free
Platform for agent observability, evaluation and improvement. AX Free costs $0 with no credit card required: 25k trace spans per month, 1 GB ingestion per month, 15 days of retention, unlimited users and evals, 10 Signal issues per month, the Alyx agent and community support.
AI / ML Read 2026-11-08 · confirmed 2026-10-16
Profile
Comet ML stable
Free
Comet makes Opik, for LLM and agent observability and evaluation, and an MLOps platform for ML experiment tracking. Opik is open source and free to self-host.
AI / ML Read and confirmed 2026-11-06
Profile
Langfuse stable
Free
Open-source LLM engineering platform for tracing, evaluating and debugging AI applications. The Langfuse Cloud Hobby plan is free with no credit card: 50k units a month (each trace, observation and score counts as one unit), 30 days of data access, 2 users, community support via GitHub, and all…
AI / ML Read and confirmed 2026-11-13
Profile
Portkey
Free
Control panel for Gen AI apps featuring an observability suite & an AI gateway. Send & log up to 10,000 requests for free every month.
AI / ML Read 2026-10-24 · catalogue date 2026-08-12
Profile
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-24, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
LangWatch
Free
A LLMOps platform helping AI teams measure, monitor, and optimize LLM applications for reliability, cost-efficiency, and performance. With a powerful DSPy component, we enable seamless collaboration between engineers and non-technical teams to fine-tune and productionize GenAI products.
AI / ML Read 2026-10-24 · catalogue date 2026-08-10
Profile
−1 stale_verification Our last read of the vendor's pricing page, on 2026-10-24, found the page different from the terms we hold. This is our confidence in the record, not a change by the vendor.
Recompute today's order yourself. The order above is a permutation seeded only on the UTC date and the query key — no vendor name, slug, id or offer field is an input. The algorithm is published, so anyone can reproduce this page's order without asking us.
date
2026-11-14
query_key
alternative-to:LangSmith
seed
93a828bf85200c266b106be01cc51d1dfcf37353b53eae02b69b367d7248b452
tie_count
5

Category Trends

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Frequently Asked Questions

What are the best free alternatives to LangSmith?
We publish no ranking of these. Nothing we record measures popularity or generosity, so naming a best or a top few would be our preference rather than our data. We hold 7 free alternatives to LangSmith, each listed below with its tier, category and the read and catalogue dates we hold. Of those, 5 carry no recorded demerit and are indistinguishable under every signal we hold, so they are listed in an order that rotates daily, 2 are demoted with the reason named. Our ranking rule is published at /criteria.
Is LangSmith's free tier still available?
The only record that would rate LangSmith is a change we could not check against an archived copy of LangSmith's page, so we are not publishing a rating for it. Our stored record says LangSmith offers a free tier (Free), and we are not publishing a stability judgement over it.
How many free alternatives to LangSmith exist?
There are 7 free alternatives to LangSmith tracked on AgentDeals across the AI / ML category.
Has LangSmith changed their pricing?
LangSmith has 1 recorded pricing change. The most recent was discovered 2026-09-01: The free tier now includes pay-as-you-go pricing for traces beyond 5k/month, and introduces LCUs and LSUs for additional costs related to compute and storage. Unconfirmed. We could not check this change against an archived copy of LangSmith's page, so it does not count toward the rating. Source: https://www.langchain.com/pricing