Buildbox alternatives

TL;DR: The closest YC-backed alternatives to <strong>Buildbox</strong> are other Y Combinator B2B companies, especially from the Summer 2026 batch. Below are 20 ranked competitors with batch, status, and team size.

Y Combinator-backed B2B companies similar to Buildbox (YC Summer 2026).

Last verified:

  • Zaplar YC Summer 2026 · Active · 8 people — Agentic Hotel Operating System
  • HyperProbe YC Summer 2026 · Active · 8 people — Your coding agent writes code. Now let it fix prod too.
  • Donkey YC Summer 2026 · Active · 7 people — The AI-native trading company: China factory-direct for US importers
  • screenpipe YC Summer 2026 · Active · 6 people — AI powered by everything you've seen, said or heard
  • Pango YC Summer 2026 · Active · 5 people — Agentic OS for e-commerce operations
  • Zomma YC Summer 2026 · Active · 5 people — Computer Use Agents for back offices in finance
  • LemonLime YC Summer 2026 · Active · 5 people — No-code AI that learns your business and self-creates automations.
  • Cerenovus YC Summer 2026 · Active · 5 people — A knowledge company
  • Ooak Data YC Summer 2026 · Active · 5 people — We build the world's largest library of real-world business workflow…
  • Luca IQ YC Summer 2026 · Active · 5 people — API First Tax Calculator for CPAs
  • Nex YC Summer 2026 · Active · 5 people — Claude Cowork for GTM Automations
  • Nebula Security YC Summer 2026 · Active · 4 people — A security engineer in your team
  • Speko YC Summer 2026 · Active · 4 people — OpenRouter for voice AI
  • COACH YC Summer 2026 · Active · 4 people — The AI Coach for in person sales reps.
  • Last Accounting Company YC Summer 2026 · Active · 4 people — Agent-native accounting firm.
  • OpenVector YC Summer 2026 · Active · 4 people — AI that turns any camera to an autonomous worker with real-time vision
  • Dialogus YC Summer 2026 · Active · 3 people — Infra for enterprise voice agents.
  • TrustAI YC Summer 2026 · Active · 3 people — Continuous compliance and governance for agents on sensitive systems
  • Assemble YC Summer 2026 · Active · 3 people — Agents for Enterprise IT
  • Litmus YC Summer 2026 · Active · 3 people — Run an async work trial on every engineer you interview.

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