Turnstone

Personal AI workspace in which a team of agents learns the user's world from connected apps, keeps what it knows in a Brain the user can review, and works on the web, Mac, iPhone and iPad; in beta.

StageUndisclosed

Founded2026

HeadquartersSan Francisco, USA

StatusPrivate

Product

Selected offerings — the AI products recorded here, not the vendor's full catalogue.

• Turnstone AI agent

  Personal AI agent team that learns the user's world from connected apps and how the user writes in each of them, lets the user review what an agent knows in a Brain workspace, runs schedules in the cloud and lets agents create helpers; used in the browser, on a Mac, on iPhone and on iPad; in beta, and the pages read publish no prices.

Similar products 60

No sourced competitor yet: no filing, vendor document or measured-market report read so far names a rival for this company, so none is asserted. The companies below are the closest by what their products do.

How this list is ranked ↗

GGumloopEarly-stageTurnstone and Gumball both list email assistance; both also serve buyers who need to use an everyday AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareRRiverUndisclosedTurnstone and River both list email assistance; both also serve buyers who need to keep an assistant's memory of a company or team and use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareCCaddyUndisclosedTurnstone and Caddy both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareJjoUndisclosedTurnstone and jo both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareLLogicalUndisclosedTurnstone and Logical both list email assistance; both also serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareLLindyUndisclosedTurnstone and Lindy both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareCCoveraUndisclosedTurnstone and Covera both list email assistance; scale not recorded for either; ships application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareAAlmanacUndisclosedTurnstone and Almanac both serve buyers who need to keep an assistant's memory of a company or team and use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareSOSentient OSUndisclosedTurnstone and Sentient both list email assistance; scale not recorded for either; ships application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareSSuperhumanUndisclosedTurnstone and Superhuman Mail both list email assistance; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareHHyperWriteUndisclosedTurnstone and HyperWrite AI Agent (Personal Assistant) both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareHHubSpotPublicTurnstone and Prospecting Agent both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareIIntuitPublicTurnstone and Intuit Assist both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareSSalesforcePublicTurnstone and Agentforce Marketing both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareEMEgoist MachinesUndisclosedTurnstone and AI Passport both serve buyers who need to keep an assistant's memory of a company or team and use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareMMicrosoftPublicTurnstone and Idea Coach both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareDDecagonLate-stageTurnstone and Decagon Email both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareLLinagoraUndisclosedTurnstone and Twake Workplace both list email assistance; scale not recorded for either; ships application and model API rather than the same layer.1 of 2 capabilitiesDifferent layerCompareGGBrainUndisclosedTurnstone and GBrain both serve buyers who need to keep an assistant's memory of a company or team and use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareEEmergentLate-stageTurnstone and Wingman both list email assistance; Turnstone's scale not recorded.1 of 2 capabilitiesShared product typeCompareFFreshworksPublicTurnstone and Freshsales both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareOOpenTagUndisclosedTurnstone and OpenTag both serve buyers who need to use an everyday AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeComparePPipedriveLate-stageTurnstone and Pipedrive AI both list email assistance; Turnstone's scale not recorded; ships application and data service rather than the same layer.1 of 2 capabilitiesDifferent layerComparePPlutoUndisclosedTurnstone and Pluto both serve buyers who need to use an everyday AI assistant; scale not recorded for either.Shared product typeCompareDDoppelLate-stageTurnstone and Doppel Email Security both list email assistance; Turnstone's scale not recorded; ships application and platform rather than the same layer.1 of 2 capabilitiesDifferent layerCompareAAutoGPTUndisclosedTurnstone and Kai both list email assistance; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareAAntinuousUndisclosedTurnstone and Antinuous both serve buyers who need to use an everyday AI assistant; scale not recorded for either.Shared product typeCompareMPMeta PlatformsPublicTurnstone and Muse both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareOFOpenClaw FoundationUndisclosedTurnstone and OpenClaw both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareWWixPublicTurnstone and Symphony by Wix both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareBBase44AcquiredTurnstone and Base44 Superagents both list email assistance; Turnstone's scale not recorded; Base44 is acquired, with no independent scale.1 of 2 capabilitiesShared product typeCompareLSLM StudioUndisclosedTurnstone and LM Studio Bionic both serve buyers who need to use an everyday AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareMMosaicUndisclosedTurnstone and Mosaic both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either; ships developer tool rather than the same layer.1 of 2 capabilitiesDifferent layerCompareTTorqLate-stageTurnstone and Torq Context Graph and Memory Layer both serve buyers who need to keep an assistant's memory of a company or team; Turnstone's scale not recorded.1 of 2 capabilitiesShared product typeCompareKKorsoUndisclosedTurnstone and Korso both serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareGGongUndisclosedTurnstone and AI Composer both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareAAnthropicLate-stageTurnstone and Claude Cowork both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareIInstantlyUndisclosedTurnstone and AI Reply Agent both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareHHarveyLate-stageTurnstone and Harvey Memory both serve buyers who need to keep an assistant's memory of a company or team; Turnstone's scale not recorded.1 of 2 capabilitiesShared product typeCompareEEvergreen.aiUndisclosedTurnstone and Evergreen.ai both serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareFFirefliesUndisclosedTurnstone and Fireflies AI Email Assistant both list email assistance; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareMLMintplex LabsUndisclosedTurnstone and AnythingLLM Mobile both serve buyers who need to use an everyday AI assistant; scale not recorded for either.Shared product typeCompareSscreenpipeUndisclosedTurnstone and screenpipe both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either; ships application rather than the same layer.Different layerCompareAArenaLate-stageTurnstone and Arena both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded; ships application rather than the same layer.Different layerCompareAAttioLate-stageTurnstone and Universal Context both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareLLogosGuardUndisclosedTurnstone and LogosGuard AI Privacy Shield both serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application and infrastructure service rather than the same layer.Different layerCompareNRNous ResearchEarly-stageTurnstone and Hermes Agent both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareGGlean (Glean Technologies)Late-stageTurnstone and Glean Intelligence both serve buyers who need to keep an assistant's memory of a company or team; Turnstone's scale not recorded; ships application and platform rather than the same layer.1 of 2 capabilitiesDifferent layerCompareSSlackUndisclosedTurnstone and Slackbot both serve buyers who need to use an everyday AI assistant; scale not recorded for either.Shared product typeCompareCCrestaLate-stageTurnstone and Cresta Composer Agent both list email assistance; Turnstone's scale not recorded.2 of 2 capabilitiesShared product typeCompareWWonderingUndisclosedTurnstone and Wondering both serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareCCohereLate-stageTurnstone and North both list email assistance; Turnstone's scale not recorded; ships API service, application and 2 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareWWorkdayPublicTurnstone and Deployment Agent both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded.1 of 2 capabilitiesShared product typeCompareNNaverPublicTurnstone and AI Briefing both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded; ships application rather than the same layer.Different layerCompareQQuoraEarly-stageTurnstone and Poe both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded; ships API service and application rather than the same layer.Different layerComparePProfoundUndisclosedTurnstone and Profound Context Manager both serve buyers who need to keep an assistant's memory of a company or team; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareSSalesloftUndisclosedTurnstone and Salesloft Cadence both list email assistance; scale not recorded for either; ships application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareKKakaoPublicTurnstone and ChatGPT for Kakao both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded; ships agent platform and application rather than the same layer.1 of 2 capabilitiesDifferent layerCompareTBThe Browser CompanyUndisclosedTurnstone and Arc Search both serve buyers who need to use an everyday AI assistant; scale not recorded for either; ships application rather than the same layer.Different layerCompareVVeniceLate-stageTurnstone and Venice both serve buyers who need to use an everyday AI assistant; Turnstone's scale not recorded; ships application rather than the same layer.Different layerCompare

Closest alternatives are pairs a vendor page itself compares. Similar products are matched from what each product does; nothing in that group is asserted as a rivalry.

Sources

Total funding

Not found · 20 Oct 2026

Pages read for this record state no funding total. Tried the home page, changelog and the company's YC profile.

Valuation

Not found · 20 Oct 2026

Pages read for this record state no valuation. Tried the home page, changelog and the company's YC profile.

Founded

Company disclosure · 20 Oct 2026

Own YC profile lists Founded: 2026; myturnstone.ai states no founding year. The pages read name no legal entity.

Public listing

Not found · 20 Oct 2026

No listing on the pages read; treated as private.

Description

Official documentation · 20 Oct 2026

Home page description: "Turnstone learns your world from day one. Build an AI team that grows with your work." The visible page is script-rendered, so the description also draws on the changelog.

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