AI infrastructure: the tools companies use
What engineering teams use to build, run and monitor AI products: inference clouds, frameworks, observability, ML platforms, vector databases and speech APIs.
1,069
companies on usedby use a tool of this category
1,069 companies on usedby use at least one of the 55 tools in this category with a public customer. Its 6 categories with a public customer start with Vector databases & search engines (290 companies) and ML platforms & training data (256 companies).Latest check Oct 15, 2026: 1,385 of 1,436 public lines checked. Counts are of companies on usedby, not of the whole market: we list a company when a public page shows its AI tools.
Categories in AI infrastructure
Companies on usedby per category, and the tools with a public customer.
- Vector databases & search engines290 companies, 9 toolsMost used: Qdrant
- ML platforms & training data256 companies, 12 toolsMost used: Weights & Biases
- AI inference & GPU cloud230 companies, 10 toolsMost used: Baseten
- Agent frameworks & AI gateways188 companies, 13 toolsMost used: LangChain
- Speech & voice APIs186 companies, 5 toolsMost used: Recall.ai
- LLM observability & evals153 companies, 6 toolsMost used: LangSmith
Newest customers
Companies first listed by a tool of this category in the last 90 days.
Most compared
Side-by-side pages with the companies behind each tool.
Questions about AI infrastructure
Answers drawn from usedby data.
Which categories make up AI infrastructure?
Vector databases & search engines (290 companies), ML platforms & training data (256 companies), AI inference & GPU cloud (230 companies), Agent frameworks & AI gateways (188 companies), Speech & voice APIs (186 companies), and LLM observability & evals (153 companies). Each category page ranks its own tools by public customers.
How does usedby rank these tools?
By the number of companies with a public line for each tool, read from dated captures of vendor customer pages, case studies, press releases and job posts. Every proof level counts in the totals and the ranking, job-post signals included (the weakest proof, shown apart in the proof bar); ties go to the stronger proofs. usedby lists a company when a public page shows it, so these counts describe the companies on usedby, not the whole market.