---
title: On Device Client SDKs
description: "Overview of Statsig on-device evaluation client SDKs that evaluate feature gates and experiments locally for low-latency rules evaluation on devices."
product: general
last_updated: 2025-09-21
token_estimate: 273
---
# On Device Client SDKs

> For AI agents: a documentation index is available at [/llms.txt](/llms.txt). Append `.md` to any page URL for markdown, or send `Accept: text/markdown`.

## How on-device eval SDKs work

Statsig's client-side On-Device Eval SDKs provide an alternate client-side architecture. The device keeps the definition of each experiment or gate in memory, which allows faster evaluation when the user object changes frequently. (On regular client SDKs, a frequently changing user object requires re-initialization.) The trade-off is that the device exposes config definitions.

Use the traditional client SDKs unless you have specific requirements that prevent doing so. If you choose to use the On-Device Eval SDKs, contact the Statsig team first to understand the privacy risks.

## Alternatives

An alternative to On-Device Eval SDKs is the [Local Eval Adapter](https://docs.statsig.com/client/concepts/local-eval-adapter), which lets you evaluate locally for only the subset of experiments and gates you need at startup, rather than exposing all configs in your project.