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).
Companies89
Y Combinator76
Form D filers12
SBIR/STTR winners1
Median amount sold (Form D)$1.6M
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 |
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Figures come only from the record linked in each row; a blank means the record gives none. How these lists are built.