# Epic Online Services

> Epic Online Services (EOS) is a free, cross-platform suite of services and SDKs for building, launching, and operating multiplayer games.

EOS is free to use: no royalty or hosting fees, no cap on the number of titles, and no limit on player accounts. Deeper anti-cheat tiers are available under a paid agreement. It is engine-agnostic and store-agnostic: it works with Unreal Engine, Unity, and custom engines, and on any storefront or platform. Using EOS does not require shipping on the Epic Games Store.

Services can be adopted individually rather than as a bundle. The catalog spans crossplay and matchmaking, lobbies and sessions, Epic Account Services and cross-platform login, friends and presence, achievements and stats, player data storage and cloud saves, voice chat, and Easy Anti-Cheat.

SDK reference documentation and the Developer Portal are not hosted on this domain. The SDK docs live at dev.epicgames.com/docs and account and product administration happens in the Developer Portal at dev.epicgames.com/portal. Easy Anti-Cheat has its own site at easy.ac.

## Services

- [Multiplayer services](https://onlineservices.epicgames.com/multiplayer): Crossplay, matchmaking, lobbies, sessions, and peer-to-peer networking.
- [Accounts and social](https://onlineservices.epicgames.com/accounts-social): Epic Account Services, cross-platform login, friends, presence, and social graph.
- [Player and game data](https://onlineservices.epicgames.com/player-game-data): Cloud saves, player data storage, achievements, stats, and leaderboards.
- [Trust and safety](https://onlineservices.epicgames.com/trust-safety): Anti-cheat, voice reporting, and moderation tooling.
- [Easy Anti-Cheat](https://www.easy.ac/): The anti-cheat service available through EOS, documented on its own site.

## Documentation and integration

- [EOS SDK documentation](https://dev.epicgames.com/docs): Official SDK reference and integration guides. Start here for any API question.
- [Resources](https://onlineservices.epicgames.com/resources): SDK downloads, plugins for Unreal Engine and Unity, and reference material.
- [Why cross-play matters](https://onlineservices.epicgames.com/learning/why-cross-play-matters): Primer on cross-play, the most commonly adopted EOS capability.

## Licensing and terms

- [Licensing](https://onlineservices.epicgames.com/licensing): Confirms what is free: unlimited titles, unlimited player accounts, no royalty or hosting fees.
- [FAQ](https://onlineservices.epicgames.com/faq): Platform support, engine support, cost, and eligibility questions.
- [Developer agreement](https://onlineservices.epicgames.com/services/terms/agreements): The EOS developer agreement.
- [Acceptable use policy](https://onlineservices.epicgames.com/services/terms/aup): Acceptable use terms for EOS.
- [Trust statement](https://onlineservices.epicgames.com/services/terms/trust-statement): Security, privacy, and data-handling commitments.
- [Subprocessors](https://onlineservices.epicgames.com/services/terms/subprocessors): List of EOS subprocessors for compliance review.

## Partners

- [Partner ecosystem](https://onlineservices.epicgames.com/partners): Third-party services that integrate with EOS, including hosting and backend providers.

## Sitemaps

- [Sitemap](https://onlineservices.epicgames.com/sitemap.xml)

## Optional

- [News](https://onlineservices.epicgames.com/news): Service launches, SDK releases, and platform announcements.
- [Developer spotlights](https://onlineservices.epicgames.com/spotlights/small-teams-big-wins-indie-developers-using-epic-online-services): Case studies from shipped titles using EOS.