devtools
(8)
Attune
Attune is a San Francisco developer-tools startup (YC X25) building drop-in build acceleration for engineering teams. Its tool, invoked by prefixing existing commands with 'hurry' (e.g. 'hurry cargo build'), delivers up to 20x faster builds through incremental compilation, remote execution, and distributed caching - with zero migration and no new config language to learn. Attune started with Rust and is expanding to Docker, npm, GitHub Actions, Swift, and Python. It also maintains an open-source project for fast, secure Linux package publishing. Founded by Xin Ding (CEO) and Eliza, who worked together for three years at FOSSA on build systems.
Interfaze
Interfaze is a San Francisco AI startup building a model purpose-built for deterministic developer tasks - OCR, web scraping, speech-to-text, object detection and classification - where consistency and verifiable output matter more than open-ended chat. Its hybrid architecture fuses specialized neural networks (CNN/DNN) directly into a transformer decoder, and the model ships as an OpenAI-compatible API with confidence scores, bounding boxes and metadata so developers can build rule-based systems on top. Founded by Yoeven Khemlani and Harsha Vardhan Khurdula, Interfaze is part of Y Combinator's 2026 batch and grew out of the team's earlier developer-API company, JigsawStack.
OneGrep
OneGrep (YC W24) is a New York-based developer-tools startup building AI agent infrastructure for DevOps. It began as a DevOps copilot that fine-tuned models on real-time telemetry to help engineers resolve incidents faster and cut observability costs, and has since expanded into tooling that lets AI agents discover, correlate, and safely operate the many SaaS and MCP-based tools engineering teams rely on. Founded by ex-Disney, Amazon, and Coinbase engineers Achintya Ashok and Brian Cripe, it went through Y Combinator's Winter 2024 batch.
Subtrace
Subtrace is a zero-code network tracer for backend servers. Started with a single command, it captures every incoming and outgoing HTTP request in real time - payload, headers, latency, and status - and shows them in a Chrome DevTools-style interface. It uses eBPF to do this without code changes or root privileges, so engineers can find, inspect, and replay production requests instead of grepping through scattered logs. The tool is open source (BSD-3-Clause) and came out of Y Combinator's Winter 2025 batch.
TestSprite
TestSprite is a Seattle-based startup building an autonomous AI testing agent that validates AI-generated code. Its agent plugs into AI IDEs like Cursor, Claude Code, and VS Code via an MCP server, then autonomously writes test plans, generates and executes tests in the cloud, diagnoses failures, and feeds fixes back to the coding agent. Founded in 2023, TestSprite has raised $8.2M total, including a $6.7M seed led by Trilogy Equity Partners in October 2025, and serves 35,000+ users. It positions itself as the 'testing backbone' of the AI-native development era.
Rainforest QA
Rainforest QA is an AI-powered, no-code software testing platform that helps product teams run regression and functional tests without building or maintaining brittle test frameworks. Founded in 2012 in San Francisco and backed by Y Combinator, the company has executed more than 42 million tests for over 10,000 startups and product teams.
Bito
Bito is a San Francisco-based AI developer tools company building agents that review pull requests and ground code generation in deep codebase context. Its AI Code Review agent plugs into GitHub, GitLab, and Bitbucket to flag bugs, security issues, and style problems before humans burn a single brain cell on them - and it speeds up PR merges by 89%, according to the company.
Founders, Inc.
Founders, Inc. (f.inc) is a 42,000 sq ft campus, community, and first-check fund at Fort Mason in San Francisco — built for the wildly ambitious founders solving hard problems at the edge of what's possible. Not a traditional VC and not a time-boxed accelerator, it combines pre-seed investment (up to $250K), a dedicated workspace with hardware labs and media studios, daily meals, and an indefinite community of 80+ builders. Founded in 2020 by serial builder Furqan Rydhan, it has backed 100+ companies across AI, AR/VR, Web3, and hardware — including thirdweb, buildspace, LiveKit, and Sync Labs. Featured in the Wall Street Journal and New York Times.