Developer Tools Startups

Deazy connects businesses with vetted, high-performing development teams to deliver digital projects. The company operates a managed marketplace where clients can access reliable external developers with quality guarantees and ongoing delivery oversight.

1 investor

DebugBear is a website monitoring service that helps site operators measure and improve page speed, optimize Core Web Vitals, and pass Google's performance assessments. It provides page speed reports along with high-level performance trends and detailed technical data.

1 investor

Decipher AI develops software that automatically generates and maintains end-to-end tests while applications evolve, detecting problems before reaching users and providing notifications when production bugs occur.

1 investor

Decode is a multiplayer canvas where product teams create diagrams, markdown plans, wireframes, and live previews of their app, then connect AI coding agents via a Desktop MCP Server to build and fix the UI based on what users mark directly on the board. It targets PMs, designers, and engineers working alongside coding agents to move from requirements to working UI.

1 investor

Datost designs and builds hardware computers and intelligent systems that operate at the edge of attention, combining industrial design, optics, and software. The company creates physical computers intended for ambient environments rather than traditional screens.

1 investor

Open-weight frontier AI lab developing hybrid reasoning language models and iterative self-improvement methods on a path toward general superintelligence.

1 investor

Deep Marketer offers an AI system that reviews Google Ads campaign data and adjusts bids and ad creatives on its own. It is aimed at digital marketers who want to cut down on hands-on campaign tuning while improving return on ad spend.

1 investor

Deep Reasoning Labs develops long-horizon coding agents aimed at large real-world code bases and mission-critical workflows.

1 investor

Deepcell offers a document format (.deepcell) that links tables, text, and slides so that editing one component automatically updates the related parts.

1 investor

DefectDojo is a DevSecOps and application security orchestration platform that integrates with 200+ security tools to help security teams automate vulnerability management and scale their operations. It offers an open source edition alongside a Pro Edition for security teams seeking automation and actionable insights.

1 investor

Delta Engine develops cross-platform game development technology and tools. The company has expanded into cryptocurrency and AI/robotics research since 2017 and 2019 respectively.

1 investor

Denied builds a runtime behavioural authorization layer that evaluates an AI agent's intended action — the content, recipient, and timing of a tool call — against defined policies before the call leaves the host. It is offered to engineering teams via native SDKs, one-line integrations into existing agent harnesses, and a global API that returns allow/deny decisions with obligations.

1 investor

Deno is an open-source JavaScript and TypeScript runtime with built-in tooling such as a package manager, test runner, formatter, linter, and type checker, and it is fully Node-compatible. It targets developers building server-side and web applications, offering zero-config TypeScript, granular security permissions, and web-standard APIs.

1 investor

Deontic builds generative AI tools and intelligent agents for validation and verification of ADAS and autonomous driving systems, including AI-driven scenario generation that converts natural language into OpenDRIVE/OpenSCENARIO formats. It integrates with IDEs like Cursor and Visual Studio Code via an MCP server, serving mobility and self-driving technology developers.

1 investor

Detail builds an automated code quality system that uses AI agents to identify and fix bugs and technical debt in codebases, prioritizing issues based on their actual importance to engineers. The platform enables "nocturnal" engineering workflows where developers write code during the day and AI agents autonomously improve code quality overnight.

1 investor

DevAI aggregates IT and network lifecycle management tools used by enterprises and applies AI to operational data to speed up root-cause analysis and remediation. It targets enterprise ITOps and NetOps teams.

1 investor

2027.dev evaluates the "Agent Experience" of software products, identifying friction points such as authentication issues, missing documentation, and confusing errors that AI agents encounter when using a tool. It lets teams run evaluations on any product flow with custom prompts and API keys, benchmark against competitors, and catch regressions in CI before changes reach production.

1 investor

Dev Tools AI provides automation software that uses large language models and computer vision to help organizations scale their web and mobile testing or deployment processes.

1 investor

Safety provides an agentless endpoint security layer that gives security teams visibility and governance over AI coding tools, packages, MCP servers, and IDE extensions across developer workstations. It detects vulnerabilities and malicious software using a proprietary data engine, deploys via MDM, and blocks threats at the point an AI agent or developer installs software.

1 investor

Payblocks is a no-code agency that builds automation and no-code solutions for companies. It appears to operate in Mexico via a "Payblocks MX" chapter.

1 investor

DevClarity is a consulting service that helps private-equity-backed engineering teams adopt AI-assisted coding tools through environment setup, hands-on training, and directed project work. It standardizes AI usage across software teams to increase development velocity and report measurable ROI to leadership.

1 investor

dev/color is a non-profit organization that supports Black software engineers through mentorship, goal setting, and community events to help them enter the tech industry and advance into leadership roles. It works with members across their careers, from college through professional practice.

1 investor

DevDynamics is an engineering intelligence platform that consolidates data from tools like Jira, GitHub, CI/CD, and PagerDuty to help engineering leaders define metrics, set goals, and track team productivity. It provides AI-generated reports and recommendations, including an AI copilot called Dyna AI.

1 investor

Bullhorn provides a software platform along with developer guides, open source libraries, and design resources for building on and extending that platform.

1 investor