Flags SDK

Flags SDK

Vercel
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About

Flags SDK is an open source library designed for integrating feature flags into Next.js and SvelteKit applications. It allows developers to manage and implement feature flags, providing flexibility with integrations for any flag provider. The SDK supports AB testing, controlled rollouts, and experimentation, helping developers ship features faster and more efficiently. It features a simple, declarative API to define and use flags, making integration effortless. With Flags SDK, developers can release new features strategically, test them in production without breaking apps, and experiment with confidence. The toolkit ensures the website remains fast while following best practices for feature flag usage.

About

SignaKit is a feature flags, A/B testing, and experimentation platform for engineering teams that need full control over software releases without per-seat pricing or vendor lock-in. Flags are evaluated locally inside the application process using a cached configuration served from AWS CloudFront, producing sub-millisecond evaluation with no network roundtrip on the hot path — bucketing is deterministic via MurmurHash3, so the same user always receives the same variant across sessions and devices. Teams can create boolean and multivariate flags with percentage rollouts, audience targeting by any user attribute, and instant kill switches for emergency rollbacks. Built-in A/B testing tracks statistical significance with configurable experiment snapshot intervals, and multi-armed bandit optimization automatically shifts traffic toward the winning variant as results accumulate — included on every plan, including Free.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Developers in need of a simple, flexible solution to manage feature flags in their web applications

Audience

Software engineers and engineering teams building web applications who need feature flags, A/B testing, and experimentation tooling without per-seat pricing.

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

Pricing

Free
Free Version
Free Trial

Pricing

$39 per month
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Review this Software

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Vercel
Founded: 2015
United States
flags-sdk.dev/

Company Information

SignaKit
Founded: 2026
United States
signakit.com

Alternatives

Alternatives

Flags SDK

Flags SDK

Vercel

Categories

Categories

Integrations

Next.js
SvelteKit
Vercel AI Gateway

Integrations

Next.js
SvelteKit
Vercel AI Gateway
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