Best Developer Tools products of the month May 2026

Actian VectorAI DB is a highly portable vector database engineered for advanced AI applications beyond traditional cloud infrastructure. Developers can efficiently store, retrieve, and reason over vast datasets locally, delivering ultra-low-latency vector search across embedded, edge, on-premise, and hybrid systems. It boasts a remarkable 22x QPS advantage over competitors like Milvus and Qdrant at 10 million vectors. This allows teams to build once and deploy consistently, ensuring full data ownership and predictable behavior across diverse environments without reliance on cloud-native infrastructure.

CodeHealth MCP Server is designed to guarantee that AI agents and coding assistants produce maintainable, production-ready code, proactively preventing the accumulation of technical debt. By leveraging deterministic CodeHealth feedback, the server intelligently guides AI agents to identify potential risks, rectify problematic code sections, and refactor existing codebases towards clearly defined quality targets. This solution can be run entirely locally, providing engineering teams with complete control over their development workflow and facilitating the seamless integration of AI into legacy systems. The ultimate outcome is significantly more reliable AI-generated code, enabling safer refactoring processes and fostering greater trust in modern engineering workflows.

ExploreYC

Your data layer for Y Combinator's startup ecosystem

Explore an extensive database of over 5,773 Y Combinator companies with the YC Company Explorer, an indispensable resource for founders, investors, and researchers. Our platform provides powerful search capabilities, interactive maps for visualizing company ecosystems, and AI-powered company intelligence that offers deep insights into market trends and opportunities. Access valuable hiring insights, comprehensive funding data, and detailed batch analytics spanning two decades of YC history. This tool empowers you to efficiently find co-founders, thoroughly validate your startup ideas, and uncover critical patterns and success factors across the vast YC alumni network.

Leetcode

Master coding skills and land your dream tech job

LeetCode is the leading platform for developers to sharpen their programming skills and prepare for technical interviews. With a massive library of over 4,000 practice problems and a thriving community, it provides the tools you need to succeed in your career. From interactive coding playgrounds to company-specific interview resources, LeetCode helps you build confidence and proficiency in 14 popular languages.

AgentPeek

Claude Code and Codex in your Mac notch

Gain critical insights into your AI models with Agentpeek, a convenient monitoring tool accessible directly from your Mac's notch. This application provides essential data on Claude Code and Codex, allowing you to track session activity, manage permissions, monitor token usage, and oversee local development servers with ease. Importantly, all session data remains local to your device, ensuring your privacy and data security are fully maintained.

Whisper Internet Infra AI Context

Free MCP for security AI: live BGP, DNS, threat graph

Whisper Internet Infrastructure AI Context is a specialized MCP server engineered to provide your AI agents with critical real-time internet infrastructure intelligence. Designed for effortless integration, it plugs into Claude, Cursor, or any other Large Language Model in just two minutes, instantly equipping your agent with vital BGP, DNS, WHOIS, and comprehensive threat-graph context. Leveraging an expansive dataset of 46 billion data points, Whisper ensures sub-millisecond query responses. A free tier is available, and the platform is proudly founded by experienced engineers from RIPE NCC and ICANN, ensuring unparalleled expertise and reliability.

Triggered Agents by Adaptive

AI agents that run automatically on business events

Adaptive empowers founders and operators to streamline their multi-tool workflows by seamlessly integrating AI agents directly into their business tools. You can easily attach these intelligent agents to specific events, enabling them to act automatically and intelligently whenever a predefined trigger fires. This means your routine tasks and complex processes can be automated with precision, freeing up valuable time and ensuring consistent, efficient operations across all your platforms.

Polarity offers comprehensive monitoring for every decision your AI agents make in a production environment. It proactively identifies and surfaces potential failure patterns, often before users even encounter them, helping you prevent issues before they impact your operations. By converting agent trajectories into actionable evaluations, Polarity enables a continuous feedback loop that significantly enhances and compounds your agent's reliability and performance over time, ensuring your AI systems operate smoothly and consistently.

Drizz

Mobile tests that write, run, and fix themselves

Drizz is an innovative AI-powered mobile test automation platform that revolutionizes how teams approach quality assurance, focusing on intuitive, intent-based testing. Instead of writing complex scripts, you simply describe the desired test in plain English. Drizz then leverages advanced Vision AI to execute these tests directly on a real device, automatically generating a reusable test case. This eliminates the need for manual scripting, avoids the frustration of flaky selectors, and drastically reduces maintenance overhead. The platform intelligently adapts to dynamic user interfaces, integrates smoothly with your existing CI/CD pipeline, and provides your team with reliable, end-to-end test coverage without adding any unnecessary complexity or resource strain.

CatchAll by NewsCatcher

Build any dataset from the web. Filtered to your criteria.

CatchAll is a sophisticated web search API designed to transform the vast open web into precise, structured datasets. Instead of sifting through countless links, you simply submit a query, and CatchAll takes over. It meticulously scans thousands of web pages, rigorously validates each result for accuracy and relevance, and then returns clean, deduplicated records. The output is not merely a ranked list of URLs, but a ready-to-use dataset of real-world events and information, perfectly formatted for seamless integration into your existing workflows and data pipelines. It streamlines data acquisition, providing actionable intelligence directly from the web.