PartyKit
PartyKit is an open source edge deployment platform on Cloudflare's infrastructure that lets developers build and scale real-time multiplayer, collaborative, and AI-powered web applications via a freemium, product-led, npm-and-CLI distribution model.
- Company typePrivate
- Founded2023
- HeadquartersLondon, United Kingdom
- Headcount1–10
- GTM typeB2B
- OfferingSoftware
What PartyKit does
PartyKit is an open source deployment platform for building, running, and scaling real-time multiplayer, local-first, and AI-powered applications at the edge. Built on Cloudflare's global infrastructure — leveraging Durable Objects, Workers, Vectorize, and Workers AI — the platform exposes a TypeScript/JavaScript server API (Party.Server) that handles WebSocket connections, HTTP requests, storage, and AI primitives, with client SDKs (partysocket, y-partykit) and framework integrations across Y.js, Automerge, Replicache, XState, tldraw, and TinyBase. The product line includes the core PartyKit Platform, Party.IO (Socket.IO backend), Cursor Party (multiplayer cursors), PartyKit AI (vector search and embeddings), and a suite of starter kits for Next.js, Remix, Replicache, TinyBase, and game templates.
The company operates a fully self-serve, product-led growth model with both Individual and Commercial tiers offered free of charge; commercial deployments are routed through the customer's own Cloudflare account and Cloudflare collects infrastructure usage fees directly. Notable adopters include Stately (state machines at the edge via Stately Sky), SiteGPT (AI customer support), Wordware (collaborative LLM prompting), Flow (collaborative notes), ViteConf (tens of thousands of frontend developers), and Epic Web Dev (Kent C. Dodds' course platform with real-time progress avatars), spanning the collaboration, AI, education, and events verticals. The platform is positioned as a horizontal developer tool rather than a vertical SaaS, and is GDPR-compliant for EEA and UK users.
PartyKit was founded in 2023 by Sunil Pai, expanded its founding team in September 2023 with CTO Jani Eväkallio (ex-verb.ai) and CXO Sylwia Vargas (ex-StackBlitz), and raised a $2.5M seed round led by Sequoia Capital with Cursor Capital, Prototype Capital, Tiny Supercomputer Investment Company, and Untitled Ventures. On April 5, 2024 the company announced it was joining Cloudflare to build the future of stateful serverless computing; PartyKit, Inc. (US-incorporated) continues to operate with its team based in London.
PartyKit firmographics
Firmographics- Name
- PartyKit
- Legal name
- PartyKit, Inc.
- Website
- https://partykit.io
- Company type
- Private
- Founded year
- 2023
- Operating status
- Operating
- Headcount range
- 1–10 employees
- Short description
- PartyKit is an open source edge deployment platform on Cloudflare's infrastructure that lets developers build and scale real-time multiplayer, collaborative, and AI-powered web applications via a freemium, product-led, npm-and-CLI distribution model.
- Ownership category
- akta.pro rank
PartyKit industry classification
Industry- Product category
- Real-time Application Development Platform
- NAICS
- Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (518), Software Publishers (5132)
- akta.pro primary industry
- Developer Portals, SDKs & Documentation Platforms (BPAMADAG)
- akta.pro secondary industries
- Community/Group Chat Platforms (BPAMACAH), Creator Tools & Production (Overlays, Alerts, Encoding, Editing, Audio) (MPAFAEAC)
Keywords
Where PartyKit is headquartered
LocationHeadquarters
- HQ city
- London
- HQ country
- United Kingdom
- HQ region
- Europe
Offices1 record
Markets served
PartyKit business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Infrastructure, Operations, Marketing or Sales
Revenue model
- Individual Tier: Free tier for individual developers with limited features including up to 10 live projects and 24-hour storage clearing.
- Commercial Tier (Self-hosted): Free commercial tier when deploying to user's own Cloudflare account. Revenue generated through Cloudflare usage fees paid by customer directly to Cloudflare.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Individual - Free tier for small projects |
| Freemium | Pay-as-you-go | Commercial - Free when using own Cloudflare account |
Go-to-market motion1 record
Distribution channels1 record
Marketing channels5 records
PartyKit product offering
Product offeringCore offering
PartyKit is an open source deployment platform for building real-time multiplayer, local-first applications, AI agents, games, and collaborative websites. Developers write TypeScript/JavaScript server code exposing WebSocket and HTTP handlers, then deploy globally to Cloudflare's edge network with automatic scaling and built-in AI capabilities including vector search and embedding models. The platform is distributed as npm packages and consumed via CLI tools with no infrastructure management required.
Product overview
PartyKit is an open source deployment platform for building real-time multiplayer, local-first applications, games, and AI agents. Built on Cloudflare's edge network, the core PartyKit Platform provides server APIs for WebSocket communication, HTTP requests, persistent storage, and built-in AI capabilities (vector database and embedding models). The ecosystem includes specialized modules: Party.IO (Socket.IO backend), y-partykit (Y.js integration for collaborative editing), partysocket (WebSocket client), Cursor Party (multiplayer cursors), and Partycore (collaborative drum sequencer). PartyKit AI provides vector search and embedding capabilities for semantic search and RAG applications. Five starter kits support Next.js, Remix, Replicache, TinyBase, and Redux-based game development. The platform is free for individual use with storage cleared every 24 hours, and commercial deployments require the user's own Cloudflare account.
Differentiator
Problem solved
Functional benefit
Products and services
- PartyKit Platform Open source deployment platform for building real-time multiplayer and local-first applications at the edge. Developers write TypeScript/JavaScript server code exposing WebSocket and HTTP handlers, deploy globally to Cloudflare's edge network with automatic scaling, and access built-in storage and AI capabilities. Targets developers building collaborative apps, games, and AI agents.
- Party.IO Socket.IO backend package that enables event-based bidirectional communication on PartyKit's edge infrastructure. Allows developers to write Socket.IO server code and deploy it with automatic scaling and global load balancing. Targets developers with existing Socket.IO applications seeking edge deployment.
- y-partykit PartyKit's native Y.js backend providing efficient CRDT-based document synchronization for real-time collaborative editing. Powers collaborative features in text editors, whiteboards, and shared state applications. Targets developers building CRDT-based collaborative tools using the Y.js library.
- partysocket WebSocket client library for connecting to PartyKit servers. Provides automatic reconnection on connection drops and React hooks (usePartySocket) for easy frontend integration. Targets frontend developers building real-time client applications that connect to PartyKit's WebSocket endpoints.
Quantifiable outcome
- Handle up to 32,000 concurrent connections per room with Hibernation enabled (vs 100 without)
Companies that use PartyKit
Customer profileNamed customers6 records
Segments2 records
Ideal customer profiles3 records
PartyKit technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration3 records
AI capability2 records
Feature6 records
PartyKit partnerships and signals
Strategic signalPartnerships
Four partnerships are on record, tiered core.
- CloudflarecorePartyKit announced joining Cloudflare on April 5, 2024 to build the future of stateful serverless computing. The partnership involves deep integration with Cloudflare's Durable Objects, Workers, and AI platforms including Vectorize and Workers AI.
- StatelycorePartnership to power Stately Sky - a service for deploying state machines to the edge. PartyKit provides multiplayer orchestration and dynamic deployment capabilities using Cloudflare Workers for Platforms.
- FlowcoreFlow uses PartyKit as the foundation for their collaborative note-taking experience. PartyKit enables real-time syncing with Y.js library integration for multiplayer collaboration.
- WordwarecoreWordware uses PartyKit to power their collaborative AI prompting interface. The platform combines Y.js, SyncedStore, and TipTap with PartyKit for real-time collaboration.
Scale indicators2 records
Recent moves6 records
Expansion highlights5 records
PartyKit competitors and assessment
Company assessmentDirect peers
- Liveblocks: Liveblocks provides a developer platform for adding multiplayer features (presence, real-time sync, comments, notifications) to web apps — the most direct competitor to PartyKit's multiplayer infrastructure offering, serving the same target market of frontend developers building collaborative SaaS.
- Ably: Ably is a real-time messaging and data stream platform with WebSocket-based pub/sub APIs — directly comparable to PartyKit's edge real-time capabilities, targeting developers building live, multiplayer, and IoT applications.
- Pusher: Pusher (acquired by MessageBird) provides hosted real-time WebSocket infrastructure for building chat, multiplayer, and notification features — overlapping directly with PartyKit's WebSocket server and real-time broadcast capabilities.
- PubNub: PubNub offers real-time infrastructure-as-a-service for chat, presence, and multiplayer apps — comparable to PartyKit's real-time multiplayer positioning, with established enterprise customers and longer market presence.
- Convex: Convex is a reactive backend-as-a-service with real-time subscriptions and TypeScript-first developer experience — directly comparable to PartyKit's developer-focused, TypeScript-first multiplayer platform targeting similar SaaS builders.
Broad incumbents
- Cloudflare Durable Objects: Cloudflare's Durable Objects (the underlying primitive PartyKit is built on) provides stateful serverless primitives directly — overlapping with PartyKit's core value proposition and now PartyKit's parent offering post-acquisition.
- Supabase Realtime: Supabase's Realtime feature provides real-time database subscriptions and presence over WebSockets — a broader backend-as-a-service platform with overlapping real-time multiplayer functionality for developers.
Emerging players
- Soketi: Soketi is an open-source alternative to Pusher/Ably providing self-hosted WebSocket infrastructure — comparable to PartyKit's open-source, developer-focused ethos but focused on self-hosting rather than edge deployment.
- StackBlitz: StackBlitz (WebContainers) provides in-browser development environments and hosts ViteConf — overlapping developer tooling with PartyKit; CXO Sylwia Vargas previously led DevRel at StackBlitz, indicating close ecosystem overlap.
Regional players
- tldraw: tldraw is a collaborative infinite canvas SDK that integrates with PartyKit (sharing office space) — both serve collaborative real-time apps but tldraw focuses on a single product (canvas/whiteboard) while PartyKit is a general-purpose multiplayer platform.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights7 records
Customer concentration
PartyKit social profiles
Digital presencePartyKit compliance and trust
Trust signalCompliance1 record
PartyKit financial estimates
Financial estimateRevenue estimate
Valuation estimate
PartyKit leadership team
Management profileNumber of profiles
Profiles4 records
PartyKit funding detail
Funding detailFunding overview
Funding rounds1 record
Investors5 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
PartyKit M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about PartyKit
What does PartyKit do?
PartyKit is an open source deployment platform for building real-time multiplayer, local-first applications, AI agents, games, and collaborative websites. Developers write TypeScript/JavaScript server code exposing WebSocket and HTTP handlers, then deploy globally to Cloudflare's edge network with automatic scaling and built-in AI capabilities including vector search and embedding models. The platform is distributed as npm packages and consumed via CLI tools with no infrastructure management required.
Is PartyKit a public or private company?
PartyKit is a private company. It is classified as corporate owned and is currently operating.
When was PartyKit founded?
PartyKit was founded in 2023. It employs 1 to 10 people.
Where is PartyKit based?
PartyKit is headquartered in London, United Kingdom, in the Europe region.
How does PartyKit make money?
Two revenue lines are on record. Individual Tier is the primary driver. The others are commercial Tier (Self-hosted).
Who are PartyKit's main competitors?
Direct peers on record are Liveblocks, Ably, Pusher, PubNub and Convex. Broad incumbents are Cloudflare Durable Objects and Supabase Realtime. Emerging players are Soketi and StackBlitz. tldraw is listed as a regional player.
Does PartyKit have an API?
Yes. PartyKit provides a server API (Party.Server) for building real-time multiplayer applications. Developers write server code in TypeScript/JavaScript that can handle WebSocket connections, HTTP requests, and broadcast messages to connected clients. The platform exposes rooms at URLs like /parties/:party/:roomId. Includes client SDKs (partysocket) for WebSocket connections and Y-PartyKit for Y.js integration. Supports deploying via CLI (npx partykit deploy) and local development (npx partykit dev). Developer documentation is at docs.partykit.io.
What industry is PartyKit in?
PartyKit's product category is Real-time Application Development Platform. Its primary akta.pro industry code is BPAMADAG, Developer Portals, SDKs & Documentation Platforms, with a secondary code of BPAMACAH, Community/Group Chat Platforms. Its NAICS code is 518.