MentionFox lists 89 Developer tools companies for 2026. Of them, 76 are Y Combinator companies (the newest batch here is Fall 2026, with 13); 12 filed a Form D notice with the SEC; 1 won an SBIR or STTR award. Across the 12 Form D notices in the table that report an amount sold, the median is $1.6M; the largest is $672M, by Groq LLC (its Form D, filed Jul 24, 2026).
Other years
All years (678) 2025 (82) 2024 (91) 2023 (79) 2022 (64) 2021 (83) 2020 (54)
Developer tools startups in 2026
| Company | What it does | Date | Amount | Round / stage | Record |
|---|---|---|---|---|---|
| Agent 37 | Fall 2026 | Y Combinator batch | Y Combinator listing | ||
| Agent Relay | The infrastructure to run coding agents for your team | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Ascii | The best cloud VMs for billions of agents | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Boat | The best cloud VMs for billions of agents | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Boxes.dev | Cloud development environments for AI coding | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| ByteAsk | The AI coding agent for C and C++ | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| herdr | building the open agent runtime | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Mirrors | Catch and fix AI agent regressions before they reach production | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| OnePatch | Automate on-call at agent-scale. | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| OpenHack | Always-on AI security engineer | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| River | The AI desktop. | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Terse | Durable state for AI agents | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Workers IO | Deterministic Virtual Machines | Fall 2026 | Y Combinator batch | Y Combinator listing | |
| Dynamic Experts, Inc. | Filed Aug 28, 2026 | $905,000 | SEC Form D | ||
| Feldera, Inc. (funding history) | Filed Aug 18, 2026 | $15.4M | SEC Form D | ||
| CodeRabbit Inc. (funding history) | Filed Aug 14, 2026 | $143M | SEC Form D | ||
| AppWizzy, Inc. | Filed Aug 3, 2026 | $100,000 | SEC Form D | ||
| Groq LLC | Filed Jul 24, 2026 | $672M | SEC Form D | ||
| Agency Tool Company | Reliable infrastructure to build, deploy and manage real-world robots. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Agent FM | One group chat to hear and steer your coding agents. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Alkera AI | Reliable and safe data engineering and data science agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Archal | API sandboxes, built for AI agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Caution | Hosting platform for software you don't want to have hacked | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Click | Summer 2026 | Y Combinator batch | Y Combinator listing | ||
| Codag | Tool call compression for agents. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Conifer | Least cost routing system to reduce 80%+ token spend | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Context.dev | We give AI agents realtime web context. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| GitCafe | The Git forge for the next hundred billion commits | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Graphify Labs | On-device knowledge graph engine for enterprises | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| hardware intelligence | AI tools for the chips your AI runs on | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Hebbian Robotics | Open source SDK for building quality control pipelines for Physical AI | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| hiloop | Autoresearch as a service: we solve your hardest measurable problems | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Hilstart | Autonomous Hardware Testing | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Hoplite | Effortlessly deploy cloud software factories. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| HyperProbe | AI engineer that fixes production issues on its own | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Inkbox | The identity and communication layer for AI agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Instaplay | AI-Native Social Platform, Starting with Games | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Jcode | The harness company | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Luca IQ | API-first tax engine for CPA firms and developers | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| machine0 | AWS for Agents | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Mentlio | Engineering Intelligence and Token Optimization for the AI-Coding Era | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Mosaic | Defining the frontier of multiplayer AI. | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Prized | A cloud devbox that feels local | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Riften | Earned intelligence for every company | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Rindler | The IDE for Tokenmaxxers | Summer 2026 | Y Combinator batch | Y Combinator listing | |
| Kavia AI, Inc. | Filed May 27, 2026 | $2M | SEC Form D | ||
| Atomic Object LLC (funding history) | Filed May 22, 2026 | $1.2M | SEC Form D | ||
| KeyRooted Inc. | Filed May 15, 2026 | $750,000 | SEC Form D | ||
| Makersquare LLC | Filed May 8, 2026 | $100,000 | SEC Form D | ||
| Amboras | AI Native Shopify | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Armature | We get your product picked by coding agents. | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| InsForge (InstaCloud) | The agent-native serverless cloud | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Inth | Monitor and fix product privacy issues before they block growth | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Keyframe Labs | Bring AI to life with the world's best interactive avatars | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Limrun | Extend cloud sandboxes with iOS, Android and more | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Linzumi | Team chat to command all your company's coding agents | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Manicule | AgentRel — Devrel For Agents | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Mault Inc. | Filed Apr 1, 2026 | $335,000 | SEC Form D | ||
| OpenWork | Spring 2026 | Y Combinator batch | Y Combinator listing | ||
| PLAN0 AI | Construction Cost Intelligence. | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Reason Machines | Reason Machines builds Reason Agent, the autonomous software engineer… | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Replicas | Run any coding agent harness in the cloud | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Saffron | Helping your company find 10x engineers | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Stage | Code review platform for humans and agents | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Superlog | Make software self-healing | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Superset | Building self-improving software | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| TesterArmy | Test your app with AI, catch bugs before users do | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Zenbu | The extensible IDE for coding agents | Spring 2026 | Y Combinator batch | Y Combinator listing | |
| Schematic, Inc. (funding history) | Filed Mar 25, 2026 | $7.4M | SEC Form D | ||
| ZeroPath Corp. | Filed Mar 23, 2026 | $7M | SEC Form D | ||
| EP Analytics, Inc.. | Rd-opc fy26 sbir phase iii high performance computing application performance prediction and profiling tools | Award starts Feb 11, 2026 | $292,338 | SBIR Phase III | Federal award record |
| /dev/fast | /dev/fast is the AI-native code forge | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| 21st | UI building blocks for the agentic internet | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Canary | Adversarial AI that breaks your AI | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Corelayer | AI production engineer for regulated industries | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Emdash | Open-source Agentic Development Environment | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Envariant | Interpretability and reasoning infra for foundation models. | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| IncidentFox | AI SRE agent that triages, coordinates, and fixes production incidents | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Khotan (formerly Pollinate) | FDE as a platform for rebuilding critical operations in software. | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Moda | Harness Engineering Infrastructure that developers love. | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| OpenSpec | Plan mode for complex features | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Overshoot | AI Infra for real-time vision applications | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Quotient Labs | Winter 2026 | Y Combinator batch | Y Combinator listing | ||
| Salus | Guardrails to validate your agent's actions before they execute | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| shortkit | Media infra for consumer apps | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Skillsync | Notion for AI chats | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Unifold | Multi-chain deposit and payment infrastructure | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| Zatanna | Turning all software into agent-first APIs | Winter 2026 | Y Combinator batch | Y Combinator listing | |
| ZeroSettle | Drop-in Direct Billing SDK for In-App Purchases | Winter 2026 | Y Combinator batch | Y Combinator listing |
Selling to these companies?
Export the list: a spreadsheet of the 89 Developer tools companies in the table below, with each one's date, amount, round or stage, the record it comes from and its MentionFox page. Free with an account; if you are not signed in, you sign up first and the download starts when you come back to this page.
Export the listA Full Report covers who runs the company, who owns it, where its money comes from and what to watch for, every claim linked to its source. See pricing.
Related startup lists
AI (348 shared) AI agent (103 shared) Cloud infrastructure (56 shared) Productivity and workflow automation (55 shared) Data and analytics (48 shared) Generative AI (38 shared)
Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.
