Braintrust free tier includes Evals, prompt playground, and data management for Gen AI… Verified November 2026. Compare with 7 alternatives in AI / ML.

Braintrust Free Tier 2026

stable

Subtypes in AI / ML: llm_evaluation — scores model or agent output against a dataset, a rubric or a judge model on runs you trigger; llm_observability — records the prompts, responses, latency, cost and tool calls an application sent to a model, for reading afterwards. We read that on 2026-09-01 from https://www.braintrust.dev/pricing, where it says: “Free usage is included for traces, evals, and your whole team” How we use this.

Limits, pricing history, and 7 alternatives. Verified November 2026. Last updated 2026-11-06.

Braintrust's free tier offers Evals, prompt playground, and data management for Gen AI… We rate it stable. The one record we hold was our own error and has been withdrawn. Best for ai / ml workloads — 7 alternatives available.

One of 89 AI / ML services we track. See our full AI / ML Free Tier Comparison →

Tier

Free

Free Tier Details

Evals, prompt playground, and data management for Gen AI. Starter plan (free): 1 GB processed data/month, 10k scores/month, 14 days data retention. Unlimited users, projects, datasets, playgrounds, and experiments. Overage: $4/GB data, $2.50 per 1k scores.

We read that on 2026-11-06 from https://www.braintrust.dev/pricing, and our check recorded: the page names Braintrust as "braintrust" and states "$4" and "$2.50" and "1 GB / month".

From braintrust.dev/pricing, read 2026-11-06:

Starter For everyone $0 / month $10 credits + tok rates 1 GB processed data + $4/GB 10k scores + $2.50/1k 14-day retention Unlimited users, projects, datasets, playgrounds, and experiments

When You'll Outgrow Braintrust's Free Tier

When your usage exceeds the free tier limits, you'll need to upgrade.
At that point, the 7 alternatives in AI / ML are each listed with the free tier they offer, so you can compare what they give you against what you have outgrown.

Pricing Change History (1 recorded)

restructured discovered 2026-09-03 · effective date unknown medium impact

Retracted — this record was our error (2026-09-06). Retracted 2026-09-06: the free tier gained rather than lost. braintrust.dev/pricing, fetched 2026-09-06, lists Starter at "$0 / month" with "1 GB processed data + $4/GB", "10k scores + $2.50/1k", "14-day retention" and "Unlimited users, projects, datasets, playgrounds, and experiments" — every figure our stored description carries, unchanged — and adds "$10 credits + tok rates" that it did not carry before. Source ↗

View all 513 pricing changes across all vendors →

Alternatives in AI / ML

How Braintrust compares against every one of the 7 we list, not against a selection of them. A surface with room for every member of a tied set may rotate their order. A surface with room for only some of them names none of them, because which ones it named would be the claim, and a claim seeded on the date is not the one we serve tomorrow. How we decide this.

Service	Free Tier	Stability
Braintrust	Free	stable
LangSmith	Free LLM observability and evaluation platform by LangChain — Developer plan is $0/seat/month with up to 5k base traces/month, then pay-as-you-go. LCU is $1.50/unit and LSU is $1.00/unit.	unrated — change unconfirmed
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.	unrated
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.	source unconfirmed
Comet ML	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.	stable
Langfuse	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…	stable
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.	unrated
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.	unrated

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 AI / ML, with the vendor's own words we read that from on its page. How we decide this.

See full comparison →

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 list above is every one of the 7 entries in that order, not a prefix of it. The algorithm is published, so anyone can reproduce this page's order without asking us.

date: 2026-11-14
query_key: alternatives:AI / ML:Braintrust
seed: 03463ebb52f63ae5bb5840863245749e9d9ca6ac899ea6a103fcd7c566c644a1
tie_count: 5

Watch Braintrust for Pricing Changes

We do not push notifications. Every change we record is readable the moment it lands, and the JSON answer carries an ETag — send it back as If-None-Match and an unchanged answer costs one 304.

curl https://agentdeals.dev/api/changes?vendor=Braintrust
curl https://agentdeals.dev/pricing-changes/feed.xml?vendor=Braintrust

API docs →

Frequently Asked Questions

Is Braintrust free?

Yes, Braintrust offers a free tier: 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. Unlimited users, projects, datasets, playgrounds, an...

What is Braintrust's free tier?

Braintrust's free tier is called "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. Unlimited users, projects, datasets, playgrounds, and experiments. Overage: $4/GB data, $2.50 per 1k scores.

Is Braintrust's free tier reliable?

Braintrust's free tier is considered stable. The one record we hold was our own error and has been withdrawn. See the pricing history below.

Is Braintrust's free tier good for production?

Braintrust's free tier can be suitable for small production workloads and side projects. We rate it stable and it offers Evals, prompt playground, and data management for Gen AI…, so it's a reasonable starting point. The one record we hold was our own error and has been withdrawn. Monitor your usage against the limits and have an upgrade plan ready.

What changed in Braintrust's pricing?

The one record we hold was our own error and has been withdrawn.

What are the best free alternatives to Braintrust?

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 Braintrust in AI / ML, each listed above with its tier. 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.

When will I outgrow Braintrust's free tier?

When your usage exceeds the free tier limits, you'll need to upgrade. When you outgrow the free tier, evaluate paid plans against alternatives — sometimes a competitor's free tier covers what you need.

What category is Braintrust in?

Braintrust is categorized under AI / ML on AgentDeals. We list 7 other AI / ML services alongside it, every one of them on this page with its free tier and the stability we publish for it.