Developer Tools Startups

Runreal Builder is a CI/CD tool designed for Unreal Engine, letting developers test against any engine version, build plugins or projects, and package for any platform. It targets game and Unreal Engine developers.

1 investor

RunRL offers a platform for improving machine learning models using reinforcement learning. The product is announced as coming soon.

1 investor

Runta builds execution infrastructure for AI agents, providing governance and enforcement at the runtime layer where agent behavior is generated. The platform draws from boundary infrastructure expertise developed at scale by the team across edge networks, API gateways, and DDoS protection.

1 investor

Runtime provides a cloud platform for deploying coding agents that work with popular AI models across teams. The platform enables specialized agents for engineering, product, design, marketing, support, finance, and other departments to automate tasks like code generation, data analysis, and workflow automation.

1 investor

RustDesk is an open-source remote desktop software that provides free remote access as an alternative to commercial solutions. It serves individuals and organizations worldwide seeking remote connectivity tools.

1 investor

Rutter offers a Unified API that connects to major accounting platforms, letting companies build and maintain multiple accounting integrations through a single data model. It targets fintech companies building integrated products, providing features such as Platform Data, Custom Fields, and API passthrough for source-level data access.

1 investor

Ryax Technologies builds a data engineering platform that orchestrates and automates data workflows across hybrid distributed infrastructures, including Edge and Cloud, for Big Data, IoT, and AI applications. It targets data scientists and their organizations, aiming to move data science algorithms into production and reduce time to market.

1 investor

Rye offers a Universal Checkout API that lets AI agents complete purchases on any web store, using AI browser automation with fraud-mitigation techniques to get past merchant checkout systems and return landed costs and completed orders. It targets developers building agentic commerce applications.

1 investor

S-cubism (株式会社エスキュービズム) provides end-to-end digital transformation support for companies, building its own software products and assembling project teams to deliver digital initiatives. The Japan-based firm develops multiple services and products that it combines to address client business challenges.

1 investor

S2C (思尔芯) develops EDA tools for semiconductor chip design and verification, including architecture design/modeling software, hardware emulation and prototyping systems, formal verification, and debug and cloud-based compute management platforms. Its products serve IC design companies working on SoCs for automotive electronics, CPU, AI, 5G, and cloud computing applications.

1 investor

SAALG Geomechanics is a Barcelona-based software startup that analyzes real-time monitoring data for geotechnical applications in construction and civil engineering. The company combines geotechnical expertise with software engineering to serve the construction industry.

1 investor

SadServers provides hands-on Linux and DevOps training scenarios and assessments for professionals, students, and companies evaluating technical candidates. The platform delivers practical, simulation-based learning through realistic server challenges.

1 investor

SafeDep builds infrastructure to make open source software safer and more trustworthy, focusing on software supply chain security for developers and organizations. It offers tools to help protect and secure open source dependencies.

1 investor

SafeStack is an application security (AppSec) program management platform that helps software teams embed secure development practices across the SDLC, using frameworks like OWASP SAMM and NIST SSDF. It offers program tracking, role-specific security education, and secure development certifications to help organizations build security culture and meet compliance requirements.

1 investor

Safety provides endpoint security and visibility for AI-powered development environments, helping security teams monitor and govern AI tools, packages, MCP servers, and IDE extensions across developer machines. The platform deploys agentlessly via MDM and detects malicious packages and vulnerabilities in software ecosystems like npm and PyPI.

1 investor

Saffron provides technical assessments for engineering hiring that evaluate how candidates work with AI coding tools. The platform captures and analyzes candidate interactions with code, AI prompts, and decisions to measure engineering competency in modern workflows.

1 investor

Sage AI automatically generates and maintains documentation for codebases by building a symbol-level knowledge graph from source code and using large language models to create and update annotations. The platform serves software engineering teams seeking to reduce onboarding time, improve code comprehension, and preserve institutional knowledge.

1 investor

SageOx builds a team-memory platform that captures decisions, discussions, and AI agent sessions and makes that context available to both people and AI assistants. It offers a recording device, CLI, MCP server, and console that integrate with coding agents and assistants like Claude Code, Codex, and ChatGPT to feed shared team context.

1 investor

Sailfish is a production debugging platform that captures runtime evidence—execution paths, variable state, affected users, and code context—from live production systems and packages it into fix-ready debug packets for engineers and AI coding agents. It targets software engineering teams, providing debugger-level context that connects frontend behavior, backend execution, logs, and database state to help diagnose and prevent bugs.

1 investor

The Sails Company develops open-source web and mobile frameworks alongside professional services for server-side development using JavaScript and Node.js. They offer consulting, design, and implementation support to help developers and organizations build enterprise-grade applications more efficiently.

1 investor

Salus is a policy-aware proxy that intercepts and manages AI agent actions, allowing, clarifying, repairing, or escalating tool calls without requiring changes to the underlying agent or stack. It serves developers and teams building AI agents across LLMs and agentic frameworks.

1 investor

1 investor

SaolaAI develops software assurance solutions designed to help companies ensure their systems remain secure and reliable without breaking in production. The platform serves engineering teams and B2B SaaS companies seeking to integrate quality assurance into their development workflows.

1 investor

Sapling provides an API and SDK toolkit that enables developers to integrate language model capabilities into applications for improved communication workflows.

1 investor