Is there a free AI developer infrastructure tool?

Yes. 12 of the 12 AI developer infrastructure tools we rank have a free tier or free open-source option. The highest-ranked is Braintrust (A tier): Yes.

How much does Braintrust cost?

Starter $0; Pro $249/mo; Enterprise custom. (verified on 2026-10-15 against the official pricing page.)

How much does Chroma cost?

OSS free; Cloud Starter $0 + usage ($5 free credits); Team $250/mo; Enterprise custom. (verified on 2026-10-15 against the official pricing page.)

How does ToolTier rank AI developer infrastructure tools?

Each tool gets an S, A, B, C or D tier with a short written reason (shown on its tool page), and prices are read from each vendor's own pricing page. Rankings are independent: sponsorship never affects tiers. Within a tier, tools are listed alphabetically.

← Best AI tools by use case

Best AI Developer Infrastructure Tools (2026)

Last updated 2026-10-15 · 12 tools ranked · Rankings are independent of sponsorships

ToolTier's top-rated AI developer infrastructure tools right now are Braintrust, Chroma, Langfuse and Modal (all A tier), followed by Arize Phoenix (B) and Helicone (B). We rank 12 AI developer infrastructure tools on an S-to-D scale, with pricing checked on each vendor's official pricing page (last verified 2026-10-15).

This page covers tools for building AI apps: vector databases, LLM observability and evals, AI gateways and GPU compute. It is the Dev Infra tier list from the ToolTier rankings, ranked from S (best) to D. Best free option: Braintrust.

Ranked list

1.A
Braintrust
Evals, logging and prompt playground for AI products.
Best-in-class eval workflow used by top AI teams.
2.A
Chroma
Open-source embedding database with serverless cloud.
Simplest DB for prototyping RAG.
3.A
Langfuse
Open-source LLM observability, evals and prompt management.
Leading open-source LLM observability.
4.A
Modal
Serverless GPU compute for AI inference, training and sandboxes.
Best developer experience for serverless GPUs.
5.A
Pinecone
Managed serverless vector database.
The default managed vector DB.
6.A
Qdrant
Open-source, Rust-based vector search engine and cloud.
Fast, efficient and generous free cluster.
7.A
Supabase
Postgres backend with pgvector, auth and storage; the default vibe-coding backend.
Backend of choice for Lovable/Bolt/v0 apps; pgvector built in.
8.A
Weaviate
Open-source vector database with hybrid search and cloud.
Strong open-source option with hybrid search.
9.A
LiteLLM
Open-source proxy/SDK to call 100+ LLMs with one OpenAI-format API.
The standard self-hosted LLM gateway.
10.B
Arize Phoenix
Open-source AI observability and evaluation.
Solid open-source tracing and evals.
11.B
Helicone
Open-source LLM observability and AI gateway.
One-line proxy setup for logging and caching.
12.B
Portkey
AI gateway with routing, guardrails and observability.
Production-grade gateway for multi-provider apps.

Comparison table

Tool	Tier	Pricing	Free tier	Verified
Braintrust	A	Starter $0; Pro $249/mo; Enterprise custom.	Yes	2026-10-15
Chroma	A	OSS free; Cloud Starter $0 + usage ($5 free credits); Team $250/mo; Enterprise custom.	Yes	2026-10-15
Langfuse	A	Hobby free; Core $29/mo; Pro $199/mo; Teams add-on $300/mo; Enterprise $2,499/mo; self-host free.	Yes	2026-10-15
Modal	A	Starter $0 (includes $30/mo compute); Team $250/mo; Enterprise custom; usage-based compute.	Yes, $30/mo credits	2026-10-15
Pinecone	A	Starter free; Builder $20/mo flat; Standard $50/mo minimum usage; Enterprise $500/mo minimum.	Yes	2026-10-15
Qdrant	A	OSS free; Cloud Free tier (1GB RAM/4GB disk); Standard usage-based; Premium minimum spend.	Yes	2026-10-15
Supabase	A	Free $0; Pro $25/mo; Team $599/mo; Enterprise custom.	Yes	2026-10-15
Weaviate	A	Open source free; Cloud Free $0; Flex from $45/mo; usage-based beyond.	Yes	2026-10-15
LiteLLM	A	Open source free; Enterprise pricing unverified.	Yes, open source	Unverified (2026-10-15)
Arize Phoenix	B	Phoenix open source free; Arize AX Free $0, Pro $50/mo, Enterprise custom.	Yes	2026-10-15
Helicone	B	Free tier; Pro $79/mo; Team $799/mo; Enterprise custom.	Yes	2026-10-15
Portkey	B	Developer free forever; Production $49/mo; Enterprise custom.	Yes	2026-10-15

FAQ

What is the best AI developer infrastructure tool?: ToolTier's top-rated AI developer infrastructure tools right now are Braintrust, Chroma, Langfuse and Modal (all A tier), followed by Arize Phoenix (B) and Helicone (B). We rank 12 AI developer infrastructure tools on an S-to-D scale, with pricing checked on each vendor's official pricing page (last verified 2026-10-15).
Is there a free AI developer infrastructure tool?: Yes. 12 of the 12 AI developer infrastructure tools we rank have a free tier or free open-source option. The highest-ranked is Braintrust (A tier): Yes.
How much does Braintrust cost?: Starter $0; Pro $249/mo; Enterprise custom. (verified on 2026-10-15 against the official pricing page.)
How much does Chroma cost?: OSS free; Cloud Starter $0 + usage ($5 free credits); Team $250/mo; Enterprise custom. (verified on 2026-10-15 against the official pricing page.)
How does ToolTier rank AI developer infrastructure tools?: Each tool gets an S, A, B, C or D tier with a short written reason (shown on its tool page), and prices are read from each vendor's own pricing page. Rankings are independent: sponsorship never affects tiers. Within a tier, tools are listed alphabetically.

Full Dev Infra tier list
Free rules and prompts library
Other use cases: AI Coding Assistant · AI Chatbot (LLM Assistant) · AI App Builder · AI Agent Framework · AI Image Generator · AI Video Generator · AI Voice Generator & Music Tool · AI Writing Tool · AI Research Tool · AI Data Analysis Tool · AI Design Tool · AI Tools for Game Development

Prices change often; confirm on the vendor's site before buying. Top picks: Braintrust, Chroma and Langfuse.

Ranked list

Comparison table

FAQ

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