---
id: unleashclient
version: "6.8.0"
license: unclear
license_treatment: permissive
maintenance: active
---

# UnleashClient — Python client for the Unleash feature toggle system!

License: permissive · Maintenance: active · Downloads: 2.5M/mo

## What it is and what it does

UnleashClient is a Python SDK that connects your application to Unleash, a feature management platform designed to control feature rollouts and reduce release risk. It lets you evaluate feature flags and variants at runtime, with support for gradual rollouts, user segmentation via context, and custom activation strategies. The SDK runs on the server side and handles synchronization with the Unleash API, caching, metrics reporting, and scheduled background updates.

The package integrates with APScheduler for background synchronization and uses requests for HTTP communication. It supports fallback functions for graceful degradation when flags are unavailable, context-based evaluation (userId, sessionId, custom properties), and both on-disk and custom cache implementations. The SDK is production-ready (Development Status 5), actively maintained, and supports Python 3.8 through 3.13.

Use it for:

- Gradually roll out new features to a subset of users to validate before full release.
- Toggle experimental features on or off without redeploying your application.
- Run A/B tests by evaluating different feature variants based on user context.
- Implement feature flags for canary deployments or blue-green release strategies.
- Disable problematic features in production without a code change or restart.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

A server-side Python SDK for integrating with Unleash, a feature management platform, to evaluate feature flags and control feature rollouts in your application.

Yes. The package is actively maintained, has low install friction, carries no known vulnerabilities, and uses a permissive MIT license. It's well-suited for any Python application that needs feature flag management. The main consideration is ensuring your Unleash server is configured and accessible before initializing the client, as feature flags default to false until synchronized.

## Install

pip install unleashclient
uv add unleashclient
poetry add unleashclient

## Installing UnleashClient

Before you install: Low install friction with a pure Python wheel distribution. The package is actively maintained with a recent release (24 days old) and supports modern Python versions (3.8–3.13). Nine runtime dependencies are manageable and well-established.

License in practice: Licensed under MIT (permissive), so you can use, modify, and distribute this package with minimal legal constraints.

Quickstart:

pip install UnleashClient

from UnleashClient import UnleashClient

client = UnleashClient(
    url="https://your-unleash-url",
    app_name="my-app",
    custom_headers={'Authorization': 'your-token'})
client.initialize_client()

enabled = client.is_enabled("my_toggle")
variant = client.get_variant("variant_toggle")
client.destroy()

The SDK must be initialized and synchronized with the Unleash API before feature flags will evaluate correctly; until then, all features default to false unless you provide a fallback function or bootstrap configuration.

Verify before relying:

- Whether custom strategies and the features property migration path in v6 affects typical use cases or only advanced deployments.
- Performance characteristics when evaluating large numbers of feature flags or handling high-frequency context changes.

## Package facts

- License: not declared (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 2.5M/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

feature flag management, feature toggle sdk, unleash python client, feature flag evaluation, gradual rollout control, feature management platform, server-side feature flags, feature-flags, release-management, a-b-testing

[View on SkillFed](https://skillfed.io/packages/unleashclient) · [View on PyPI](https://pypi.org/project/unleashclient/)