№01YC
AI Pest & Weed Identification
Real-time computer vision that finds individual weeds and pests so you treat the plant, not the field. 90%+ less spray, same or better yield.
Field Guide · Startup Ideas
Startup ideas worth building.
A growing field guide of concrete, buildable startup ideas — drawn from notable Requests for Startups, founder conversations, and patterns we keep seeing. Skim the list, find the one that won't leave you alone, then go.
120
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18
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01 — 88
Agriculture & Environment
Plant-by-plant precision replacing blanket chemistry.
№02YC
Precision Micro-Application Robotics
Robots that act on the AI's eye — micro-doses to single plants, coordinated across a fleet.
№03YC
Bio-Alternatives to Synthetic Pesticides
Microbes, peptides, and RNA-based defenses. Engineer plants to defend themselves.
№41FF
Domestic Rare Earth Refining
Separate and purify the 17 elements every magnet, motor, and missile needs. China owns 90% of this step. Build the Western alternative.
№42Khosla
Low-Carbon Cement at Scale
Cement is 8% of global CO2. New chemistries that drop in to existing kilns and beat Portland on price unlock the entire decarbonization stack.
№85Atlas
Farmer-to-Business Direct Commerce
Digital marketplace connecting smallholder farmers directly to restaurants, grocers, and corporate food buyers — cutting out distributors and improving farmer income by 30–50%.
№86Atlas
Fractional Farm Ownership Marketplace
Platform where accredited investors purchase fractional stakes in sustainable farms worldwide, earning revenue share and optionally receiving produce. Impact investing meets agricultural exposure.
№87Atlas
Seasonal Crop Pre-Purchase Platform
Futures-style marketplace where food manufacturers and retailers commit to purchasing a harvest in advance at agreed prices — giving farmers capital certainty to plant at scale.
№88Atlas
Peer-to-Peer Microgrid Energy Trading
Software layer for rural solar microgrids that lets households and small businesses buy and sell surplus generation within a community, reducing diesel dependency and lowering energy costs.
04 — 45
Science & Research
Closed-loop discovery: propose, synthesize, test, iterate.
№04YC
AI-Native Drug Discovery Engine
Full automation of hypothesis → synthesis → assay → analysis. The lab as a program.
№05YC
Materials Science Discovery Platform
Autonomous design-make-test cycles for novel materials.
№06YC
Protein Engineering Loop
End-to-end AI for protein design, expression, screening, and optimization.
№43Khosla
$80 Genome Sequencing
Push consumable cost low enough that sequencing happens at every clinic visit. Population-scale genomics becomes a primary care input, not a specialty referral.
№44Stripe
Research Productivity Engine
Measure scientific output across labs and funders. Surface promising researchers years before traditional citation metrics catch up.
№45Khosla
Fusion Plant Component Supply
Tokamak vendors are emerging faster than the supply chain that feeds them. Build the magnets, vacuum systems, and tritium handling kit.
07 — 94
Services Automation
Service-as-a-product. Replace the firm, not the spreadsheet.
№07YC
AI Insurance Brokerage
Replace traditional brokers entirely. AI handles the workflow, you collect the commission.
№08YC
AI Accounting, Tax & Audit
Fully automated delivery for SMB and mid-market. Software wrapped in a service contract.
№09YC
AI Compliance Management
Continuous monitoring and reporting. Vertical variants for healthcare, finance, etc.
№10YC
AI Healthcare Administration
Billing, claims, prior auth, scheduling. Replace the legacy admin vendor stack.
№46a16z
AI-Native Law Firm
Acquire a mid-market firm, automate the workflow underneath, keep the relationships. Software margins on a billable-hour business.
№47Sequoia
AI Recruiting Firm
Sourcing, screening, scheduling, reference checks run by agents. Charge a placement fee that prices as if humans did the work.
№48a16z
AI IT Managed Services
Buy regional MSPs, replace ticket queues with agents, keep the contracts. The ops cost line collapses while revenue holds.
№49a16z
AI 911 & Emergency Dispatch
Triage, geolocate, summarize, route. Cut time-to-response while shrinking dispatcher headcount per incident.
№50Sequoia
Continuous Penetration Testing
Always-on adversarial agents probing the production attack surface. Replace the annual pentest with a live feed.
№93Atlas
ESG & CSR Impact Measurement Platform
SaaS that tracks, quantifies, and audits a company's environmental and social impact across operations and supply chain — producing board-ready reports and third-party-verifiable certifications.
№94Atlas
Drone Site Inspection & Monitoring
Software-managed drone-as-a-service for construction sites, utilities, and agriculture — automated flight scheduling, AI defect detection, and timestamped photo records replacing manual inspections.
11 — 92
Personalized Medicine
n=1 medicine, finally feasible at consumer scale.
№11YC
Personalized Health Data Agent
Genomics + wearables + EHR + diagnostics, synthesized into individual prevention plans.
№12YC
At-Home Diagnostics Kit
Consumer-grade early detection paired with an AI interpreter.
№13YC
Personalized mRNA Therapy
n-of-1 genetic therapies. The FDA door is opening; walk through it.
№51PG
Continuous Cancer Surveillance
Liquid biopsy plus wearable signals running every quarter. Catch disease at stage zero instead of stage three.
№52Sequoia
AI Clinical Documentation
Ambient capture of the visit, structured note in the EHR, billing codes attached. Give physicians their evenings back.
№53Khosla
Xenotransplant Organ Supply
Gene-edited pig organs as a reliable supply for kidney and heart failure. The waitlist becomes a scheduling problem.
№89Atlas
Frontier Telemedicine Platform
Async and live video consult platform built for low-bandwidth environments — 2G/3G-optimized, offline clinical note queuing, and integration with community health workers in the last mile.
№90Atlas
Medical Tourism Coordination Marketplace
AI-powered platform to find, compare, and book high-quality medical procedures abroad — handling travel logistics, pre-op prep, and post-op follow-up coordination in one place.
№91Atlas
Low-Cost Point-of-Care Diagnostics
Hardware and software that deliver lab-quality results for malaria, TB, HIV, and diabetes markers from a portable device under $500, usable by community health workers with minimal training.
№92Atlas
Community Health Worker Enablement Software
Mobile-first platform for CHWs to conduct patient intake, follow care protocols, collect vitals via Bluetooth peripherals, and escalate to physicians — closing the last-mile clinical gap.
14 — 96
Enterprise AI Infrastructure
Make the company itself legible to its agents.
№14YC
Company Brain
Pull from Slack, email, tickets, databases, meetings. Output a living, executable map of how the company actually runs.
№15YC
AI Operating System for Companies
One intelligence layer over Slack, Linear, GitHub, Notion, calls. Self-improving feedback loops across every artifact.
№16YC
Dynamic Software Customization
Ship software as primitives. Let users (and their agents) reshape the UI to fit how they actually work.
№54a16z
Regulation-as-Code Engine
Train on the full banking, insurance, and healthcare codebase. Compliance answers in seconds instead of partner-track legal review.
№55a16z
Qualitative Data Warehouse
Calls, interviews, free-text, voice notes, indexed and queryable next to the structured data. The other 80% of what the company knows.
№56a16z
Personal Writing Model
Per-employee fine-tunes that draft email, slides, and docs in the user's actual voice. Output indistinguishable from the human.
№95Atlas
AI Pitch Deck Generator
Generates investor-ready pitch decks from a structured founder brief — slide structure, financial model placeholders, market sizing narrative, and competitive positioning — in under five minutes.
№96Atlas
VC Fund Performance Analytics
Research and benchmarking platform that normalizes VC fund returns against public market equivalents, visualizes portfolio construction trends, and tracks valuation step-ups across cohorts.
17 — 100
AI-Native SaaS Replacements
Rebuild the category with AI in the foundation, not bolted on.
№17YC
Project Management Challenger
Undercut on price, leapfrog on capability. Asana and Jira are the world's largest backlog of bad UX.
№18YC
Chip Design Software
Open or proprietary AI-native EDA. The 10M-line incumbents look untouchable until they're not.
№19YC
ERP Challenger
AI-first enterprise resource planning. The biggest SaaS prize hiding in plain sight.
№20YC
Industrial Control Systems
AI-native ICS for manufacturing and utilities. Modernize decade-old codebases.
№21YC
Supply Chain Software
AI-native SCM that out-reasons SAP and Oracle on day one.
№57a16z
Workday Replacement
AI-native HRIS and finance. Modern stack, agent-driven workflows, none of the implementation tax.
№58a16z
Salesforce Replacement
Rebuild the system of record around agent reads and writes. Reps stop doing data entry; the pipeline updates itself.
№59a16z
Domain-Specific Search Engine
Answer engines for law, science, finance, medicine. Beat Google on the queries professionals actually run.
№60Stripe
Adaptive Tutoring Platform
Bloom's 2-sigma, productized. One-on-one mastery for every K-12 subject at marginal cost zero.
№61PG
Email Replacement Protocol
Inbox as a todo list, not a message queue. Senders declare priority and deadlines; recipients control what lands.
№97Atlas
Angel Portfolio Tracking SaaS
Purpose-built portfolio management for individual angel investors — pro-rata tracking, follow-on modeling, valuation mark-to-market, and LP-style reporting for syndicates.
№98Atlas
VC Fund Administration Platform
Back-office software for emerging fund managers: cap table automation, waterfall calculations, K-1 generation, LP portal, and quarterly reporting — removing the need for a dedicated CFO until Series B.
№99Atlas
AI Investor Matching Platform
Matches founders to the right venture investors based on thesis alignment, sector focus, check size, and portfolio synergy — replacing cold outreach with scored warm introductions.
№100Atlas
Emerging Market Startup Data Platform
Affordable Crunchbase-equivalent for founders, investors, and analysts tracking startup activity across Africa, Southeast Asia, and Latin America — with local currency funding data and founder profiles.
22 — 64
Software for Agents
Build for the user that doesn't have a mouse.
№22YC
Agent-First API Platform
Machine-readable APIs, MCPs, CLIs. Agents discover, sign up, and use tools programmatically.
№23YC
Agent-Native CRM
Rebuild CRM for agent workflows. Fast, reliable, programmatic.
№24YC
Agent-Native Email
An inbox that agents drive natively. The end of the human-only email client.
№25YC
Agent-Native Observability
Monitoring built around tool calls, branching, backtracking, and context windows.
№62a16z
Agent Wallet Infrastructure
Custody, signing, spending limits, and audit trails for autonomous AI accounts. Banking for software that doesn't sleep.
№63a16z
Proof of Personhood
Privacy-preserving unique-human IDs. The base layer for every system that needs to keep agents and bots out.
№64a16z
Agent-Native Browser
A browser engine designed for headless agent traffic. Deterministic DOM, structured outputs, sandboxed credentials.
26 — 67
Hardware & Semiconductors
Silicon and physical iteration loops at startup speed.
№26YC
Inference Chips for Agents
Silicon for agentic execution patterns: fast context switching, native speculative decoding, agent-shaped KV caches.
№27YC
Space Inference Chips
Inference silicon optimized for mass, thermal, radiation. Reusable rockets are about to need it.
№28YC
Hardware Supply Chain Acceleration
Design-to-part in days, not weeks. Build a Shenzhen-speed ecosystem on US soil.
№29YC
Rapid Prototyping Manufacturing
Mechanical designs → physical parts in days. Hardware iteration as a service.
№30YC
Robotics Actuators & Components
Fast-turnaround actuator and component supply for the next decade of robotics startups.
№65a16z
On-Device Foundation Models
Compressed multimodal models that run on phones, glasses, and cameras. Latency, privacy, and offline as features.
№66PG
Auto-Parallelizing Compiler
Take single-threaded code, ship it across cores and accelerators. The performance dividend developers stopped collecting fifteen years ago.
№67a16z
Spatial Computing SDK
World models, hand tracking, and scene understanding as a developer platform. The toolkit Vision Pro and Orion shipped without.
31 — 70
Space & Industrial
Manufacturing in places that aren't Earth.
№31YC
Lunar Mining & Extraction
Electrolyze regolith for silicon, aluminum, iron, titanium. 3D-print structures from molten Moon.
№32YC
In-Space Manufacturing
Industrial production in microgravity. Some products only exist when gravity stops interfering.
№68a16z
Free-Space Optical Comms
Beam-steering and modulation for satellite-to-satellite and satellite-to-ground laser links. RF spectrum is full; light isn't.
№69a16z
Satellite Ground Stations
The bottleneck nobody is building. Orbital capacity is exploding; the Earth-side antenna network is a decade behind.
№70a16z
Reusable Rocket Servicing
Inspection, refurb, and turnaround for booster fleets. Pit crews for orbital launch.
33 — 76
Defense & Security
Counter-swarm is the new air defense.
№33YC
Counter-Swarm Software Platform
Real-time fusion of radar, camera, jammers, interceptors into one operational picture.
№34YC
Counter-Swarm Interceptor Hardware
Neutralize 50+ drones per shot. Change the cost curve of defense.
№35YC
Non-Kinetic Swarm Defense
Aerosols, entanglement, rotor fouling. Attack the autonomy stack as jamming loses relevance.
№36YC
Drone Defense as Distributed Systems
Software-defined air defense. More Cloudflare than Raytheon.
№71FF
Domestic HALEU Fuel
High-assay low-enriched uranium for the next generation of small reactors. Without it, advanced nuclear can't run.
№72a16z
Soldier-Carried Power
Portable kilowatt-class power for distributed units. Batteries are the limiting reagent of modern infantry.
№73FF
GPS-Denied Navigation
Vision, inertial, celestial, and signals-of-opportunity fusion. Assume the satellites are jammed.
№74FF
Autonomy Command & Control
One operator, hundreds of unmanned assets across air, sea, ground. The orchestration layer the Pentagon doesn't have.
№75FF
Mesh Battlefield Networks
Self-healing, jamming-resistant comms with dynamic spectrum management. Cellular for contested environments.
№76a16z
Submarine Manufacturing
The Navy is short attack subs by a decade. New yards, new automation, new vendor base.
37 — 101
Enterprise Sales
Ship months-not-years AI directly to F500 buyers.
№37YC
AI for Fortune 500 Problems
Sell directly to F100/F500 ops leaders. Solve nuanced operational problems with AI-native software.
№77Stripe
Cost Disease Analytics
Show F500 buyers exactly why their ops costs diverged from benchmark. Sell the diagnosis, then sell the fix.
№101Atlas
CFO-in-a-Box for SMBs
Automated financial dashboards, cash-flow forecasting, and a Q&A bot trained on corporate financial documents — giving sub-$10M revenue companies institutional-grade FP&A without a full-time CFO hire.
38 — 79
Supply Chain & Critical Infrastructure
Visibility and resilience for the things modern life depends on.
№38YC
Semiconductor Supply Chain 2.0
Real-time wafer and packaging allocation. Sub-tier risk monitoring. Export compliance automation.
№39YC
Semiconductor Bottleneck Solutions
Advanced packaging, HBM allocation, export-control navigation. Bottleneck-as-business.
№78FF
Factory-as-Product Manufacturer
Vertically integrated CNC and additive lines selling parts, not equipment. Hadrian for the next ten DoD primes.
№79a16z
Earth Observation Verticals
Pick one industry (insurance, shipping, ag) and sell decisions, not pixels. The generalist EO dashboard is a dead format.
40 — 104
Cross-Cutting Infrastructure
Compilers and runtimes for the agent era.
№40YC
AI Compiler for Agent Execution
Purpose-built compiler for agent-loop hardware. Optimize task switching, memory, speculation for agentic patterns.
№80a16z
Regional AI Hypercenter
Three to six gigawatts of compute, sited and powered. Strategic infrastructure that prints contracts for two decades.
№81a16z
Stablecoin Payment Rails
Point-of-sale and payout infra for SMBs to take stablecoins instead of cards. Two-percent margin recovery at the merchant.
№102Atlas
Global Payments Infrastructure for Underserved Markets
Stripe-equivalent for countries where Stripe doesn't operate — compliant local acquiring, multi-currency settlement, and embedded finance APIs for SaaS and e-commerce founders in Africa, South Asia, and MENA.
№103Atlas
Secondary Market for Private Equities in Emerging Markets
Compliant platform for founders, early employees, and angel investors in developing economies to access liquidity for private shares — with KYC/AML, valuation support, and legal documentation.
№104Atlas
Market Localization Platform for Global Expansion
AI-powered tooling that adapts a US or EU company's website, product listings, and marketing collateral for entry into emerging markets — translation, cultural adaptation, and demand-signal analysis in one workflow.
82 — 84
Consumer & Creative
What you build when the user is a person, not a process.
№82a16z
Real-Time Generative Video
Latency-optimized models for live video-to-video. AI bandmates, instant style transfer, collaborative creation with no render wait.
№83a16z
AI Companion With Inner Life
Friends with motivations, memory, and an ongoing schedule the user isn't part of. Reciprocal, not on-demand.
№84a16z
Personal Brain Export
Aggregate the user's email, messages, and posts into a private model that thinks like them. Decision support trained on a life.
105 — 108
Venture & Private Markets
Tooling for the investors and fund managers who back the next generation of startups.
№105Atlas
LP Reporting Automation for Emerging Fund Managers
Automated quarterly and annual reporting to limited partners — portfolio company summaries, IRR/TVPI/DPI calculations, cash flow statements, and narrative generation — cutting reporting time from weeks to hours.
№106Atlas
Fantasy Venture Investing Platform
Paper-trading simulation where users build and manage virtual startup portfolios, compete on leaderboards, and develop real investment intuition — discovery layer for identifying tomorrow's top angel investors.
№107Atlas
VC Term Sheet Analysis Tool
AI that parses term sheets, flags non-standard clauses, benchmarks terms against market comps, and surfaces negotiation leverage points — giving first-time founders institutional-grade legal intelligence.
№108Atlas
Online-First Angel Investing Platform for Emerging Markets
Syndicate and deal-flow platform purpose-built for angel investors deploying capital into Africa, Southeast Asia, and Latin America — with local regulatory scaffolding, cross-border wire support, and co-investor discovery.
109 — 112
Education & Human Capital
Access to knowledge and skill-building as infrastructure, not luxury.
№109Atlas
Adaptive K-12 Learning Platform for Emerging Markets
Offline-capable, mobile-first adaptive tutoring app for reading and mathematics — curriculum-aligned to local standards, works on low-end Android devices, and surfaces teacher dashboards for classroom deployment.
№110Atlas
E-Learning Platform for Government & Public Sector Employees
Credentialed upskilling platform for civil servants — procurement, public finance, digital governance, and policy design — sold as a multi-year enterprise license to ministries and municipalities.
№111Atlas
AI Language Preservation & Documentation Tools
Platform combining crowdsourced transcription, LLM-assisted translation, and corpus management for endangered languages — enabling communities and linguists to build lasting digital archives.
№112Atlas
Founder Fundraising Education Hub
Structured online curriculum teaching pre-seed and seed founders how to raise capital — pitch mechanics, term sheet literacy, investor targeting, and due diligence prep — with cohort accountability.
113 — 116
Logistics & Commerce
Moving goods and money more efficiently across fragmented, high-friction markets.
№113Atlas
AI-Powered International Freight Forwarding Platform
End-to-end digital freight platform matching shippers with carriers across borders — real-time quote engine, automated customs documentation, shipment tracking, and dispute resolution for complex multi-modal routes.
№114Atlas
Excess Inventory Liquidation Marketplace
B2B marketplace connecting small businesses with surplus inventory to buyers who can move it quickly — discounted bulk lots, automated pricing, and logistics coordination to recover working capital.
№115Atlas
Construction Project Management Software
Field-first SaaS for mid-market contractors: bid management, subcontractor scheduling, materials procurement, punch list tracking, and client reporting — built for project managers who live on a job site, not a desk.
№116Atlas
Niche Market Localization Services Platform
On-demand localization marketplace for technical, legal, and medical content in languages underserved by Google Translate — connecting vetted specialist translators with B2B buyers who need accuracy over speed.
117 — 120
Built Environment
Software and systems for how we design, build, and inhabit physical space.
№117Atlas
AI Building Materials Cost Optimizer
Platform that aggregates regional supplier pricing, forecasts commodity price movements, and recommends lowest-cost compliant substitutions for custom homebuilders and general contractors — saving 10–20% on material spend.
№118Atlas
Prefabricated & Modular Housing Design Marketplace
Online marketplace of certified, permit-ready modular and prefabricated home designs — purchasable as download packages with manufacturer referrals, reducing design-to-groundbreak timelines by months.
№119Atlas
Smart Building Systems Integration Platform
Middleware connecting HVAC, access control, lighting, energy monitoring, and occupancy sensors from different vendors into a single building intelligence layer — sold to commercial real estate operators and facilities managers.
№120Atlas
Farmer Project Management & Supply Chain Software
Vertical SaaS for smallholder and mid-scale farm operations — crop planning, input procurement, harvest scheduling, bulk sales order management, and buyer invoicing in one mobile-first platform.
Reader's notes
How to read a list like this without wasting a year.
Highest TAM
SaaS replacements (17–21), Company Brain / AI OS (14–15), supply-chain infrastructure (38–39).
Fastest to revenue
Services automation (7–10) and direct enterprise sales (37). Boring beats clever in year one.
Deepest moat
Hardware (26–35), discovery loops (4–6), chip supply chain (38). Slow to build, hard to copy.
Newest category
Software for agents (22–25) and dynamic interfaces (16). The interface itself is up for grabs.
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