Hegel AI
YC S23New York City, US · Founded 2023 · 2 employees · 5 known investors
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Hegel AI develops open-source software tools that help developers experiment with, evaluate, and monitor generative AI models including language models, vector databases, and image generators. Their toolkit assists in selecting appropriate models, testing prompts, adjusting configurations, and tracking system behavior in live environments.
Also known as Moxi: Model Exchange Infrastructure · Hegel AI · Hegelai
Founders & leadership· Y Combinator alumni (S23)
Hegel AI was founded in 2023 by Kevin Tse.
Investors · 5
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Company profile
researched Aug 2026Hegel AI develops open-source tooling for building applications with generative AI models, including large language models, vector databases and text-to-image models such as Stable Diffusion. Its stated purpose is to help developers select the right model, prompt and configuration, and to monitor model behavior once applications are in production.
The company's main product is PromptTools, described as a developer-focused open-source SDK for experimenting with and evaluating prompts, models and vector databases, distributed as a Python library on GitHub. Developers supply test cases and the models or vector databases they wish to compare; Hegel AI provides the testing infrastructure to run experiments in notebooks and to scale them into reusable test suites. Supported evaluation strategies include auto-evaluation by another model, systematic checks such as structured output validation and semantic similarity to an expected output, and human feedback collected through a notebook UI. Stated use cases include monitoring GPT-4 regressions, auditing models for safety and measuring vector database performance.
Alongside the open-source library, the company offers enterprise support for experimentation and early access to a hosted UI and observability tools.
Founding story
Founders Kevin Tse and Steven Krawczyk met about nine years before the company's 2023 launch as undergraduates at the University of Chicago. They later both worked on the open-source deep learning library PyTorch at Meta and Google, contributing to the core library, data loading and the XLA compiler library, and previously worked at Amazon and Bridgewater Associates.
Business model
Hegel AI distributes its core evaluation tooling as open source and offers enterprise support for experimentation together with early access to a hosted UI and observability products, positioning paid offerings around the open-source project.
Paid enterprise support for experimentation and access to hosted UI and observability tools layered on the free open-source library.
Traction
The open-source library reported over a thousand downloads per week since launch. Published testimonials come from a data science manager at McMaster-Carr and a co-founder of Watto AI.
Latest developments
Following its open-source launch, the company was offering enterprise support for experimentation and early access to a hosted UI and observability tools.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
An early-stage, pre-seed developer tools company in the LLM evaluation and observability segment, backed by Y Combinator and Cervin Ventures.
The company positions its offering as the first open-source, developer-focused SDK for experimenting with and evaluating prompts, models and vector databases, addressing continuous LLM regression testing and apples-to-apples model comparison, which it describes as unaddressed by academic metrics or manual inspection. Its founding team consists of former PyTorch engineers from Meta and Google.
Technology
An open-source Python SDK, PromptTools, that provides testing infrastructure for prompts, LLMs and vector databases. It supports notebook-based experiments that can be scaled into reusable test suites, with evaluation via model-based auto-evaluation, structured output validation, semantic similarity to expected outputs, and human feedback gathered in a notebook UI. The tooling covers LLMs, vector databases and text-to-image models including Stable Diffusion.
Go-to-market
Distribution through an open-source Python library and GitHub repository, a Discord community, and direct contact for enterprise support and early access to hosted products; the company participated in Y Combinator's Summer 2023 batch.
Developers building applications with language models, including software engineers, startup founders and researchers, with enterprise support offered to companies requiring experimentation and observability tooling.
Geography
Headquartered in New York City, New York.
History
Founded in 2023 and based in New York City, the company joined Y Combinator's Summer 2023 batch with Harj Taggar as primary partner, launching its PromptTools open-source library for language model evaluation. Cervin Ventures lists it as a pre-seed portfolio company.
Compiled by commissioned research from 5 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 2
launches, deals, and filingsHegel AI participated in Y Combinator's Summer 2023 batch, with Harj Taggar as primary partner.
The company launched PromptTools, an open-source, developer-focused Python SDK for experimenting with and evaluating prompts, models and vector databases, alongside enterprise support and early access to a hosted UI and observability tools.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 5
primary sources listed
- Hegel AI: Open source tools for developing generative AI applications | Y Combinatorycombinator.com · web
5 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Hegel AI do?
- Hegel AI builds open-source developer tools for evaluating and testing large language models and prompts.
- Who founded Hegel AI?
- Hegel AI was founded by Kevin Tse in 2023.
- Who are Hegel AI's investors?
- Hegel AI's investors include Amino Capital, Cervin, Samsung Next, TransLink Capital, Y Combinator.
- Where is Hegel AI headquartered?
- Hegel AI is headquartered in New York City, US.