Developer Tools Startups

LLUMO builds AI optimization tools that provide recommendations and insights to help AI teams improve LLM performance and accuracy while reducing costs. It targets high-growth AI businesses looking to enhance their AI-driven customer experiences.

3 investors

LM Studio offers Bionic, a locally-run AI agent designed to work with open models for creativity, work, and coding tasks. The product runs natively on local machines rather than in the cloud.

3 investors

Loadmill provides API and end-to-end testing tools designed for teams operating at scale with distributed systems, prioritizing determinism and reliability over test coverage volume. The company addresses the gap between how systems are actually used and how tests are designed, helping teams maintain confidence as their infrastructure grows more complex.

3 investors

LocusX develops KAIRO, an AI-powered bug fixing platform for video game and complex software development that shortens the time to report, analyze, fix, and verify bugs. Initially aimed at game studios, the company plans to expand to other software development verticals.

3 investors

Logical Intelligence is developing an energy-based AI model aimed at generating verified code for critical systems across industries.

3 investors

Loom Network is a multichain interoperability platform and Delegated Proof of Stake blockchain (Basechain) that lets developers build and host Solidity-based, Ethereum-compatible decentralized applications with fast, gas-free transactions. It serves dapp developers across major chains such as Bitcoin, Ethereum, Binance Chain, and Tron, and also runs CryptoZombies, a code school for learning to build Ethereum dapps.

3 investors

Loophole Labs is a systems infrastructure company that builds Architect, a Kubernetes platform for pod hibernation and live migration of workloads across nodes, zones, and clouds to avoid spot instance preemption and cold starts. It also offers AGX, an agent sandbox platform for running untrusted code on an in-house hypervisor, serving engineering and infrastructure teams.

3 investors

Lottielab is a tool for creating and editing Lottie animations, with support for importing assets from design tools and shipping animations to apps and websites. It targets designers and developers working with animated graphics across web and mobile platforms.

3 investors

Luciq provides an observability platform for mobile applications that uses AI agents to detect, prioritize, and resolve issues across the app lifecycle. It serves mobile development teams working throughout the app development and release process.

3 investors

Lume built software to automate customer data integration for engineering teams, using AI to discover schemas, map data, validate quality, and generate code automatically. The company has closed operations.

3 investors

Luzid builds an operating system for SAP enterprise resource planning transformations that captures and structures organizational knowledge generated during complex ERP implementations. The platform creates a context layer for enterprise AI agents by extracting data as a byproduct of ongoing project work.

3 investors

Prasso provides an engineering intelligence platform that automatically tracks changes across an engineering organization, offers AI-based code review, and includes an agent that answers questions and performs actions. It is aimed at software engineering teams.

3 investors

MacStadium provides Mac mini servers to developers of free and open-source projects for Apple platforms including macOS, iOS, tvOS, and watchOS. The company sponsors over 100 projects to support infrastructure and testing resources for the Apple developer ecosystem.

3 investors

Maestro is an open-source mobile UI testing tool that runs human-readable YAML end-to-end tests on iOS simulators and Android emulators, with a CLI, visual test IDE (Studio), cloud runner, and an MCP server for AI agents. It targets mobile development teams building and running automated UI tests locally and in CI.

3 investors

MagicBell provides notification infrastructure for product teams to build notification experiences for their users. The platform enables developers to implement notification systems quickly without extensive engineering effort.

3 investors

MagicBlock builds blockchain infrastructure, including a modular stack and ephemeral rollups, for developers creating high-performance on-chain applications on Solana. Its technology targets gaming, DeFi, and other Web3 use cases.

3 investors

Maisa is an automation platform that combines AI reasoning with deterministic logic to create accountable, auditable AI agents for enterprise business processes. The system enables enterprises and data teams to build intelligent automation with transparent decision-making by processing information through a Knowledge Processing Unit that shows its work, rather than operating as a black box.

3 investors

Makora builds a platform that automatically writes, optimizes, and deploys high-performance GPU code, using AI to handle GPU kernel generation, inference optimization, and real-time performance tuning across different hardware environments. It targets teams running AI infrastructure that want to reduce compute costs and improve performance.

3 investors

ManaMind builds AI-powered agents that automate quality assurance testing in video games by understanding and playing games like human players. The company serves game development teams seeking to accelerate testing while freeing human QA staff for creative and high-judgment work.

3 investors

Manifest Product Security helps organizations identify and resolve software supply chain risks by providing visibility into product builds, tracking vulnerabilities, and automating compliance through SBOM and VEX management integrated into the software development lifecycle.

3 investors

Manus is an AI agent platform that automates complex workflows and business processes for teams without requiring additional headcount. It enables users to build full-stack applications with automated coding, database, deployment, and payment integration.

3 investors

Maritime provides cloud infrastructure for running AI agents, giving each agent its own isolated, persistent virtual computer while handling hosting, scaling, and sleep/wake automatically. It serves companies and developers that need to deploy and manage large numbers of AI agents without maintaining their own infrastructure.

3 investors

Massdriver provides infrastructure automation and management for cloud-native organizations, enabling developers and operations teams to provision and manage infrastructure with ease while maintaining compliance and operational standards. The platform abstracts away complexity by offering standardized, consumable building blocks that handle Day Two operations including monitoring, scaling, and compliance out of the box.

3 investors

MedStack provides a compliance platform that lets developers deploy healthcare applications on their choice of cloud provider while automatically meeting healthcare privacy regulations and industry security requirements (such as PHI protection and SOC 2). It serves healthcare app developers and digital health innovators in North America.

3 investors