FD

Fifth Door

Game platform where people describe a game to an AI agent that builds and publishes it, remix existing games and play others' games, in public beta, with an MCP server and SDK for developers who publish from their own coding agent.

StageUndisclosed

Founded2025

HeadquartersSan Francisco, USA

StatusPrivate

Product

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

• Fifth Door Application

  Browser platform where a user describes a game in Studio and Fifth Door's agent builds and publishes it, other players' games can be remixed, and developers can publish their own static web games from Cursor, Claude Code or Codex through an MCP server; in public beta.

Similar products 89

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 ↗

CCursorAcquiredFifth Door and Cursor Mobile do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; Cursor is acquired, with no independent scale.2 of 2 capabilitiesShared product typeCompareCClineEarly-stageFifth Door and ClinePass do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent and developer tool rather than the same layer.2 of 2 capabilitiesDifferent layerCompareZIZed IndustriesEarly-stageFifth Door and Zed do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships developer tool rather than the same layer.2 of 2 capabilitiesDifferent layerCompareCCognitionLate-stageFifth Door and Devin Desktop do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSStackBlitzUndisclosedFifth Door and WebContainer API do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships infrastructure service and platform rather than the same layer.2 of 2 capabilitiesDifferent layerCompareBABlackbox AIUndisclosedFifth Door and Blackbox CLI do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent, API service and 1 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareJJetBrainsUndisclosedFifth Door and Junie do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareGGitLabPublicFifth Door and GitLab Duo Non-Agentic Chat both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareVVercelLate-stageFifth Door and v0 do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareBBase44AcquiredFifth Door and Base Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; Base44 is acquired, with no independent scale; ships AI agent, developer tool and 1 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareLLovableLate-stageFifth Door and Lovable do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships platform rather than the same layer.2 of 2 capabilitiesDifferent layerCompareRReplitLate-stageFifth Door and Replit do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareEEmergentLate-stageFifth Door and Emergent do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent and platform rather than the same layer.2 of 2 capabilitiesDifferent layerCompareFFactoryLate-stageFifth Door and Factory Droids do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent, developer tool and 1 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareAFAmp Frontier CorporationUndisclosedFifth Door and Amp do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent and developer tool rather than the same layer.2 of 2 capabilitiesDifferent layerCompareRRoomoteUndisclosedFifth Door and Roomote do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent rather than the same layer.2 of 2 capabilitiesDifferent layerCompareACAugment CodeLate-stageFifth Door and Auggie CLI do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent and developer tool rather than the same layer.2 of 2 capabilitiesDifferent layerCompareAHAll Hands AIEarly-stageFifth Door and OpenHands do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent, agent platform and 1 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareAAnacondaLate-stageFifth Door and AI Workspaces do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareKCKilo CodeAcquiredFifth Door and Kilo Cloud Agents both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; Kilo Code is acquired, with no independent scale; ships AI agent, API service and 1 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareBByteDanceUndisclosedFifth Door and TraeCode do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ByteDance's scale not comparable: only a revenue estimate, no market cap or valuation.2 of 2 capabilitiesShared product typeCompareAAtlassianPublicFifth Door and Jira Coding Agent do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareOOpenCodeUndisclosedFifth Door and OpenCode do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent and API service rather than the same layer.2 of 2 capabilitiesDifferent layerCompareSServiceNowPublicFifth Door and Build Agent do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSSAPPublicFifth Door and SAP Joule for Developers do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareIImbueLate-stageFifth Door and Sculptor do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareGGitarAcquiredFifth Door and Gitar both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; Gitar is acquired, with no independent scale; ships AI agent rather than the same layer.1 of 2 capabilitiesDifferent layerComparePAPoolside AILate-stageFifth Door and poolside do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent and agent platform rather than the same layer.2 of 2 capabilitiesDifferent layerCompareGGreptileUndisclosedFifth Door and TREX both list agentic coding; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships developer tool rather than the same layer.1 of 2 capabilitiesDifferent layerCompareZZ.ai (Zhipu AI)PublicFifth Door and GLM Coding Plan do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareYYandexPublicFifth Door and SourceCraft Code Assistant do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareAAmazonPublicFifth Door and Kiro do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSSonarLate-stageFifth Door and SonarQube Remediation Agent both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent and developer tool rather than the same layer.1 of 2 capabilitiesDifferent layerCompareBBridgeMindUndisclosedFifth Door and BridgeMind both list agentic coding; both also serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareCCodeRabbitLate-stageFifth Door and CodeRabbit Agent for Slack both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent and developer tool rather than the same layer.2 of 2 capabilitiesDifferent layerCompareSSiemensPublicFifth Door and Industrial Copilot both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareQQodoLate-stageFifth Door and Qodo Software Map both serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareFFreshworksPublicFifth Door and Freddy AI Copilot for Developers do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSSourcegraphLate-stageFifth Door and Cody both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareSStepFunLate-stageFifth Door and Step Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareCCanvaLate-stageFifth Door and Canva Code both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareMMetaGPTUndisclosedFifth Door and Atoms both list code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent rather than the same layer.1 of 2 capabilitiesDifferent layerCompareAAccenturePublicFifth Door and GenWizard do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareIIBMPublicFifth Door and IBM watsonx Code Assistant for Z do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareMAMoonshot AILate-stageFifth Door and Kimi Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareFFigmaPublicFifth Door and Figma Make both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareKKuaishouPublicFifth Door and CodeFlicker do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareMMicrosoftPublicFifth Door and GitHub Copilot do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareMAMistral AILate-stageFifth Door and Mistral Vibe Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareFFramerLate-stageFifth Door and Framer AI both list code generation; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareDDeepSeekLate-stageFifth Door and DeepSeek both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareAAlibabaPublicFifth Door and Qoder CN do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareXxAIAcquiredFifth Door and Grok Build do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; xAI is acquired, with no independent scale.2 of 2 capabilitiesShared product typeCompareBBaiduPublicFifth Door and Baidu Comate do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareRReflectionLate-stageFifth Door and Mirror CLI both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships developer tool and model API rather than the same layer.1 of 2 capabilitiesDifferent layerCompareAAlphabet (Google)PublicFifth Door and Google Antigravity do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSSnowflakePublicFifth Door and Snowflake CoCo do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent, API service and 2 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareAAnthropicLate-stageFifth Door and Claude Agent SDK do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareSShopifyPublicFifth Door and Shopify AI Toolkit both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareHHarnessLate-stageFifth Door and AI Code Review both serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareWWixPublicFifth Door and Wix Harmony both list code generation; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareHCHuawei CloudUndisclosedFifth Door and CodeArts Agent do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareCAC3 AIPublicFifth Door and C3 Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.2 of 2 capabilitiesShared product typeCompareMPMeta PlatformsPublicFifth Door and Muse Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareWWorkdayPublicFifth Door and Developer Agent do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareGGuild.aiUndisclosedFifth Door and Guild Software Factory both list agentic coding; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships agent platform and developer tool rather than the same layer.1 of 2 capabilitiesDifferent layerCompareUUiPathPublicFifth Door and UiPath ScreenPlay both list agentic coding; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareAAmikaUndisclosedFifth Door and Amika cloud devboxes both list agentic coding; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships agent platform rather than the same layer.1 of 2 capabilitiesDifferent layerCompareLSLM StudioUndisclosedFifth Door and LM Studio Bionic both list agentic coding; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareOOpenRouterLate-stageFifth Door and Ori both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded; ships AI agent, developer tool and 1 more rather than the same layer.1 of 2 capabilitiesDifferent layerCompareOOpenAILate-stageFifth Door and Codex do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareDDatadogPublicFifth Door and Bits Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareMMiniMaxPublicFifth Door and MiniMax Code both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareTTencentPublicFifth Door and CodeBuddy do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.2 of 2 capabilitiesShared product typeCompareMMastraEarly-stageFifth Door and Mastra Code do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships AI agent, API service and 3 more rather than the same layer.2 of 2 capabilitiesDifferent layerCompareZZendeskLate-stageFifth Door and Zendesk App Builder both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareSSASUndisclosedFifth Door and SAS Viya Copilot both list code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareAAdobePublicFifth Door and Development Agent both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareCClickHouseLate-stageFifth Door and ClickHouse Agents both list code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareAAAxelera AILate-stageFifth Door and Axelera Wingman do comparable work on agentic coding and code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either; ships developer tool and hardware rather than the same layer.2 of 2 capabilitiesDifferent layerCompareSSenseTimePublicFifth Door and SenseNova both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareAAAutomation AnywhereUndisclosedFifth Door and Automation Anywhere Code both list code generation; both also serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeComparePPalantirPublicFifth Door and AI FDE both list agentic coding; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareSASkywork AIUndisclosedFifth Door and Skywork Desktop both list agentic coding; both also serve buyers who need to code with an AI assistant; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareZZapierLate-stageFifth Door and Zapier SDK both list code generation; both also serve buyers who need to code with an AI assistant; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareLLaunchpadUndisclosedFifth Door and Launchpad AI Assistant both serve buyers who need to code with an AI assistant; scale not recorded for either; ships developer tool and platform rather than the same layer.Different layerCompareWWebflowUndisclosedFifth Door and Webflow AI both list code generation; scale not recorded for either.1 of 2 capabilitiesShared product typeCompareSASarvam AILate-stageFifth Door and Sarvam Coding Agents both list agentic coding; Fifth Door's scale not recorded.1 of 2 capabilitiesShared product typeCompareJJFrogPublicFifth Door and JFrog Boost both serve buyers who need to code with an AI assistant; scale not recorded for either; ships developer tool, infrastructure service and 1 more 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 · 18 Oct 2026

Pages read for this record state no funding total. Tried /about, /docs, /tos and /privacy.

Valuation

Not found · 18 Oct 2026

Pages read for this record state no valuation.

Founded

Company disclosure · 18 Oct 2026

The company's YC profile lists Founded: 2025.

Public listing

Not found · 18 Oct 2026

No listing on the pages read; treated as private.

Description

Official documentation · 18 Oct 2026

About page: "Create games without writing a single line of code using our AI"; terms name Fifth Door, Inc. as the operator.

Open Fifth Door in the directory

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