aid: fern-bot
name: Fern Bot
description: >-
  Fern (operating as Ishiki Labs) is a Y Combinator (Winter 2026) physical-AI
  startup building high-fidelity, custom robot world models that let robotics
  companies evaluate and train their robot policies at scale in software. Fern
  provides plug-and-play reinforcement-learning environments generated from a
  foundational world model: robotics teams seed varied starting scenes from
  their production environments, test and improve policies entirely in
  simulation, and Fern generates RL heads on top of existing policies to raise
  speed and success rates — a continual-learning flywheel where production
  robots improve every week. Founded in 2025 by CEO Amit Yadav (ex-Meta LLaMA /
  Reality Labs research scientist) and CTO Robert Xu (ex-Meta Reality Labs and
  Citadel Securities). As of this profile Fern publishes a marketing site, a
  whitepaper, and case studies but no public developer API, SDK, or
  documentation surface.
url: https://raw.githubusercontent.com/api-evangelist/fern-bot/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- y-combinator
x-tier: stub
x-tier-reason: portfolio-lead
x-yc-batch: W2026
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://fern.bot/icon.svg
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Robotics
- Physical AI
- Reinforcement Learning
- World Models
- Simulation
- Infrastructure
- Y Combinator
apis: []
common:
- type: Website
  url: https://fern.bot
- type: Whitepaper
  url: https://fern.bot/whitepaper
- type: CaseStudies
  url: https://fern.bot/case-studies
- type: LinkedIn
  url: https://www.linkedin.com/company/fernbot
- type: X
  url: https://x.com/ishikilabs
- type: DomainSecurity
  url: security/fern-bot-domain-security.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence