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14,448 startups · 29 programs

Turnstone

Active · The best model-agnostic Grokbot alternative

WebsiteYC profile

Why it ranks

How the rank works
7signal of 100 · rising 7
  • went through YCProgram · this site+4
  • team of 3Team size · YC's directory+3.1

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

Competitors

AISpine AIShared: work done, real work, agentYC S23San FranciscoStartup →AIRomaShared: already know, done, workYC F26Startup →AIInduction LabsShared: already know, work, onceYC S26San FranciscoStartup →AINixoShared: already know, workYC S25San FranciscoStartup →AIAsideShared: real work, already, knowYC F25San FranciscoStartup →
Companies closest to Turnstone
Company
Spine AIShared: work done, real work, agentYC S23ActiveAI, Devtools
RomaShared: already know, done, workYC F26ActiveAI
Induction LabsShared: already know, work, onceYC S26ActiveAI, Devtools
NixoShared: already know, workYC S25ActiveAI
AsideShared: real work, already, knowYC F25ActiveAI

Adjacent

Developer toolsConvoyShared: already know, workYC W22LondonStartup →AIInactiveLanternShared: already knowYC W24San FranciscoStartup →AIRavenShared: work done, already, agentYC F26BYStartup →AIFluentlyShared: already know, realYC W24San FranciscoStartup →AIStampShared: second brain, calendar, emailYC W25San FranciscoStartup →
Companies next to Turnstone
Company
ConvoyShared: already know, workYC W22ActiveDevtools
LanternShared: already knowYC W24InactiveAI, Data, Devtools
RavenShared: work done, already, agentYC F26ActiveAI
FluentlyShared: already know, realYC W24ActiveAI
StampShared: second brain, calendar, emailYC W25ActiveAI

Also from W26 in AI

All of W26
AI/dev/fast/dev/fast is the AI-native code forgeYC W26San FranciscoStartup →AI10x ScienceThe AI-native platform for next-generation protein characterization.YC W26San FranciscoStartup →AI21stUI building blocks for the agentic internetYC W26San FranciscoStartup →AIAemonThe Forward-Deployed AI Research EngineerYC W26San FranciscoStartup →AIAgentic FabriqThe control plane for AI agents.YC W26San FranciscoStartup →AIAlt-XBuilding the best venue for private markets exposure.YC W26Los AngelesStartup →
Company
/dev/fast/dev/fast is the AI-native code forgeteam of 4ActiveAI, Devtools
10x ScienceThe AI-native platform for next-generation protein characterization.team of 5hiringActiveAI
21stUI building blocks for the agentic internetteam of 3ActiveAI, Devtools
AemonThe Forward-Deployed AI Research Engineerteam of 3hiringActiveAI, Devtools
Agentic FabriqThe control plane for AI agents.team of 2ActiveAI
Alt-XBuilding the best venue for private markets exposure.team of 2ActiveAI, Data

Founders

  • Aryan VijFounder/CEO
  • Jai BhatiaFounder/CTO

About Turnstone

Turnstone is the best model-agnostic Grokbot alternative. Run persistent Agents on your Mac with the AI subscriptions or API keys you already have On Turnstone, you can connect multiple AI subscriptions / API keys in one place, and build a team of agents just like you would on Grokbot. When a subscription runs out, your Agent can automatically move to another connected subscription with available capacity. You can switch between accounts and model providers within an agent, and its conversation and context persists.

YC batch
W26 · Winter 2026
Status, per YC
Active
Category
AI
Team size
3
Location
San Francisco, CA, USA
Founded
2026
Checked
7h ago

YC tags: AI

Changes seen

One-linerNov 2, 2026

Rewrote its one-liner; it read "Work with agents that already know you"

Source ↗

Turnstone in W26: 199 companies, 81% AI

LinkedIn

Turnstone: questions

Which YC batch was Turnstone in?

Turnstone was in Y Combinator's Winter 2026 batch (W26).

Is Turnstone still active?

Y Combinator lists Turnstone as active.

Who founded Turnstone?

Turnstone's founders, as listed on its YC page: Aryan Vij (Founder/CEO), Jai Bhatia (Founder/CTO).

Where is Turnstone based?

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