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31 lines
2.5 KiB
Markdown
31 lines
2.5 KiB
Markdown
---
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title: Unleash introductory overview
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---
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One of the most important aspects of the architecture to understand is that feature toggles _are evaluated in a client SDKs_ which runs as part of your application. This makes toggle evaluations super-fast (_we're talk nano-seconds_), scalable and resilient against network disturbances. In order to achieve this Unleash compromises a small update-delay when you change your toggle configurations until it is fully propagated to your application (in terms of seconds and is configurable).
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If you want more details you can read about [our unique architecture](https://www.getunleash.io/blog/our-unique-architecture).
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### Unleash Server {#unleash-server}
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Before you can connect your application to Unleash you need a Unleash server. You have a few options available:
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1. **Unleash Open-source**
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- [Docker](../deploy/getting-started.md)
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- [Helm Chart](https://github.com/unleash/helm-charts/)
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- [Click-to-deploy on Heroku](https://www.heroku.com/deploy/?template=https://github.com/Unleash/unleash)
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2. **Unleash Enterprise**
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- [Hosted Plans](https://www.getunleash.io/plans)
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- [Self-hosted](https://www.getunleash.io/blog/self-host-your-feature-toggle-system)
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### System Overview {#system-overview}
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- **Unleash API** - The service holding all feature toggles and their configurations. Configurations declare which activation strategies to use and which parameters they should get. [API documentation](/api)
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- **Unleash Admin UI** - The dashboard used to manage feature toggles, define new strategies, look at metrics, etc. [Create your first feature toggle](user_guide/create-feature-toggle.md)
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- **Unleash SDK** - Used by clients to check if a feature is enabled or disabled. The SDK also collects metrics and sends them to the Unleash API. [See all our SDKs](sdks/index.md)
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- **Unleash Proxy** - Sits between frontend/native applications and the Unleash API. Ensures high performance and that you don't expose the full feature toggle configuration to end-users. [Read more about Unleash Proxy](sdks/unleash-proxy.md)
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To be super fast (_we're talking nano-seconds_), the [client SDK](sdks/index.md) caches all feature toggles and their current configuration in memory. The activation strategies are also implemented in the SDK. This makes it really fast to check if a toggle is on or off because it is just a simple function operating on local state, without the need to poll data from the database.
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