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14,448 startups · 29 programs

a0.dev

Active · We make mobile apps using AI.

WebsiteYC profile

Why it ranks

How the rank works
9signal of 100 · rising 5
  • went through YCProgram · this site+4
  • team of 3Team size · YC's directory+3.1
  • hiringHiring · Titles (titles.fru.dev), YC+2

A sum of public facts, not a judgement and not investment advice.

Competitors

AIDraftbitShared: quality apps, mobile apps, high qualityYC W18ChicagoStartup →AIAppstackShared: mobile appsEF 2025ParisStartup →Developer toolsInactiveUnflowShared: mobile apps, nativeYC S19New York CityStartup →AIAcquiredEmerge ToolsShared: mobile apps, developerYC W21Los AngelesStartup →AIRorkShared: mobile apps, nativespeedrun SR005San FranciscoStartup →
Companies closest to a0.dev
Company
DraftbitShared: quality apps, mobile apps, high qualityYC W18ActiveAI, Devtools
AppstackShared: mobile appsEF 2025Not statedAI
UnflowShared: mobile apps, nativeYC S19InactiveDevtools
Emerge ToolsShared: mobile apps, developerYC W21AcquiredAI, Devtools
RorkShared: mobile apps, nativespeedrun SR005Not statedAI, Devtools

Adjacent

OthervibecodeShared: mobile appsNeoStartup →OtherBridgefyShared: mobile appsAlchemist Class 22MiamiStartup →OtherOnespot (Seabird Apps, Inc.)Shared: mobile appsAlchemist Class 29New YorkStartup →OtherAvocarrotShared: mobile appsEFLondonStartup →OtherGridRasterShared: high quality, mobileAlchemist Class 18Mountain ViewStartup →
Companies next to a0.dev
Company
vibecodeShared: mobile appsNeo Not statedOther
BridgefyShared: mobile appsAlchemist Class 22Not statedOther
Onespot (Seabird Apps, Inc.)Shared: mobile appsAlchemist Class 29Not statedOther
AvocarrotShared: mobile appsEF Not statedOther
GridRasterShared: high quality, mobileAlchemist Class 18Not statedOther

Also from W25 in AI

All of W25
AIOnlookThe Developer tool for DesignersYC W25San FranciscoStartup →AIAdamAI Powered CADYC W25San FranciscoStartup →AIArtilLet your agents message teammates and other agentsYC W25LondonStartup →AIassistant-uiOpen Source React.js Library for AI ChatYC W25San FranciscoStartup →AICodevisorThe fastest native app for agentic engineering.YC W25San FranciscoStartup →AIConfident AIProduction Monitoring & Evals for AI AgentsYC W25San FranciscoStartup →
Company
OnlookThe Developer tool for Designersteam of 4hiringActiveAI, Devtools
AdamAI Powered CADteam of 4hiringActiveAI, Devtools
ArtilLet your agents message teammates and other agentsteam of 2ActiveAI, Devtools
assistant-uiOpen Source React.js Library for AI Chatteam of 3ActiveAI, Devtools
CodevisorThe fastest native app for agentic engineering.team of 2ActiveAI, Devtools
Confident AIProduction Monitoring & Evals for AI Agentsteam of 7hiringActiveAI, Devtools

Founders

  • Seth SetseFounder/CEO
  • Ayomide OmolewaFounder/CTO

About a0.dev

a0.dev is a platform that helps mobile developers build high quality apps in days instead of weeks by generating custom react native projects. We've launched top ranking apps that have been used by hundreds of thousands, and now we're creating the tools we wish we had to build faster.

YC batch
W25 · Winter 2025
Status, per YC
Active
Category
AI, Developer tools
Team size
3
Location
San Francisco, CA, USA
Founded
2025
Checked
6h ago

YC tags: Developer Tools, Generative AI, Design, AI

Changes seen

TagsOct 19, 2026

Newly tagged AI; no longer tagged Artificial Intelligence.

Source ↗

a0.dev in W25: 166 companies, 84% AI

LinkedIn

a0.dev: questions

Which YC batch was a0.dev in?

a0.dev was in Y Combinator's Winter 2025 batch (W25).

Is a0.dev still active?

Y Combinator lists a0.dev as active.

Who founded a0.dev?

a0.dev's founders, as listed on its YC page: Seth Setse (Founder/CEO), Ayomide Omolewa (Founder/CTO).

Where is a0.dev based?

a0.dev lists San Francisco, CA, USA as its location on YC's directory.