Portfolio companies

Langbase

LLM Pipeline & Memory
Seed 2023

Composable pipeline and memory infrastructure for production LLM applications. Enables teams to build, deploy, and scale AI features without managing the underlying orchestration complexity.

Superagent

Open-Source Agent Framework
Pre-Seed 2023

Open-source framework for building and deploying production AI agents. Provides the scaffolding — tools, memory, routing — that agent developers need to ship reliably.

Dust.tt

Enterprise LLM Builder
Seed 2023

Platform for building internal LLM applications and workflows without custom infrastructure. Designed for enterprise teams deploying AI across their operations.

Xpander.ai

Agent Action Execution
Seed 2024

Action execution layer for AI agents — enabling agents to interact with external systems, APIs, and data sources in a structured, reliable way.

Orb

Usage-Based Billing Infra
Seed 2022

Usage-based billing infrastructure for the modern software stack, with native support for AI workload pricing models. The financial plumbing for AI-native businesses.

Mintlify

AI Developer Documentation
Seed 2022

AI-powered documentation platform that keeps developer docs accurate and current. The surface where developers first encounter a product — built to meet them where they work.

Greptile

AI Code Review & Search
Seed 2023

AI system for code review and codebase search — understands the full context of a repository and surfaces relevant patterns, risks, and suggestions at review time.

Archyve

Private LLM Retrieval
Pre-Seed 2024

Private knowledge retrieval for LLM applications — enabling enterprises to query their internal data with foundation models without exposing sensitive information to external systems.

Portfolio companies listed represent investments made by Hearthstone Fund I and Hearthstone Fund II. Past performance is not indicative of future results. Company descriptions reflect publicly available information about each company's product focus.