Developer Tools Startups

Guilde rapidly prototypes, validates, and scales new businesses using advanced models and tools, helping founders move from problem definition to first customers in weeks. The company supports venture creation and incubation across various sectors.

1 investor

Osmosis is a reinforcement fine-tuning platform that provides reinforcement learning infrastructure to help developers build and deploy AI agents that improve from experience. Users retain ownership of their fine-tuned models, with options to serve on the platform or export for self-hosting.

1 investor

Gumlet provides video and image optimization, hosting, and delivery infrastructure, offering DRM protection, adaptive streaming, a branded player, a global CDN, and video APIs for developers. It serves online course creators, ecommerce sellers, and filmmakers looking to host, secure, and monetize media.

1 investor

Guru Network builds a multi-chain AI compute layer that orchestrates AI agents across blockchain and off-chain systems to automate complex user flows and business processes. The platform enables decentralized applications and retail users to embed AI agents natively while earning network rewards.

1 investor

HCL GUVI is an EdTech platform offering project-based career programs, live classes, and coding practice tools (such as CodeKata, WebKata, and SQLKata) with placement guidance across 1300+ courses. It focuses on tech upskilling in regional and global languages for learners in India, and also provides corporate training and hiring solutions.

1 investor

Haiku builds collaboration tools for software companies, offering products spanning marketing and sales, branding, and design-to-code workflows. It serves software teams as a B2B developer tools provider.

1 investor

Hal9 is a technology startup founded by a former RStudio engineer; this page is a memorial tribute to Juraj Slugen, an early advisor and mentor to the company. The page does not describe the company's product in concrete terms.

1 investor

Hall runs a messaging service for business teams that works across operating systems and devices. It delivers real-time, SMS-style conversations to mobile and desktop users, targeting companies that want internal communication available wherever employees are.

1 investor

Hallway is an AI companion that runs in the browser, able to interact with any website as a tool to take actions on the user's behalf. It is positioned as a personable assistant that performs tasks rather than only answering questions.

1 investor

Hammerstone is a software development consultancy run by two developers specializing in backend framework work for clients building web applications.

1 investor

Handover provides a live stress-testing service for Standard Operating Procedures (SOPs) across incident response, data breach, supply chain, and payment operations. The platform guides teams through their SOPs under timed conditions to surface gaps, stale information, and missing decision owners before incidents occur.

1 investor

Hannon Hill builds content management and personalization software for organizations with complex web ecosystems, serving higher education, healthcare, government, and mission-driven organizations. The company focuses on helping web teams manage and optimize digital experiences at scale while maintaining governance and accessibility.

1 investor

hapi is an open-source Node.js backend framework with zero external dependencies, secure defaults, and a plugin-based extensibility model, aimed at developers and enterprise teams building scalable server applications. Originally developed to handle Walmart's Black Friday traffic, it emphasizes security, code quality, and predictability for large distributed engineering teams.

1 investor

Hardhat is a development environment for Ethereum smart contracts, providing tools for testing, deployment, debugging, code coverage, and verification, with a runtime rewritten in Rust for performance. It serves Solidity developers ranging from individual builders to engineering organizations, supporting tests in both Solidity and TypeScript along with an extensible plugin ecosystem.

1 investor

Epsilla is an Agent-as-a-Service platform that enables enterprises to build and deploy AI agents without extensive engineering resources, featuring a no-code builder, RAG capabilities, and vertical AI agent solutions for specific industries including manufacturing, healthcare, legal services, and financial services.

1 investor

Harper Systems provides a unified runtime that consolidates data, logic, and application functions into a single memory space, eliminating the fragmentation of traditional microservices architectures. The platform is designed for developers and AI coding agents to build applications with reduced latency and infrastructure complexity.

1 investor

Genesis Molecular uses deep learning and molecular simulation to accelerate drug discovery and development. The platform helps identify and optimize drug candidates for challenging diseases.

1 investor

Bitfab is a platform for testing, building, and optimizing multi-turn AI agents and data pipelines through scenario simulation and replay. It captures production data interactions and enables engineers to safely test agent behavior with mocked external calls and defined outcomes.

1 investor

Hatch Early Learning provides digital learning platforms and data analytics tools designed to help early childhood education programs maximize federal, state, and local funding while supporting school readiness, literacy, and social-emotional development.

1 investor

Hatchways provides customizable GitHub-based technical assessments where candidates perform practical tasks such as reviewing code, submitting pull requests, or improving system design. It is aimed at companies hiring software engineers, helping them build practical interview processes that reduce engineering interview load and evaluate skills rather than pedigree.

1 investor

Hats Protocol provides onchain programmable role management for organizations, enabling automated onboarding and permission administration across decentralized systems. The protocol serves DAOs and organizations looking to streamline operational workflows through blockchain-based role infrastructure.

1 investor

Havik Solutions develops portable military training and simulation systems using commercial off-the-shelf hardware and advanced gaming technology, serving U.S. Department of Defense operators and units for mission readiness, call-for-fires training, and distributed combat scenario exercises.

1 investor

Haystack is a GitHub-integrated system that evaluates AI-generated pull requests by analyzing code context, diffs, agent reasoning, and test results to determine whether changes can be merged, require fixes, or need human review. It helps engineering teams manage high volumes of AI-generated code changes while maintaining quality standards and focusing human review effort on complex decisions.

1 investor

Heal creates production-like local sandboxes from a codebase and runs automated end-to-end tests to find bugs, aimed at software development teams using coding agents. It also documents codebases into specs for spec-driven development and keeps sandboxes, specs, and tests in sync as code changes.

1 investor