
Technology
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Mobile SDKs
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YC W26
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Valuation:
Undisclosed

Last Updated:
March 24, 2026

Provides a privacy-first, unified mobile SDK combining analytics, version gating, and in-app messaging for iOS and React Native apps, designed for one-line integration and zero user data tracking by default.
No official public roadmap. GitHub activity shows active iOS SDK development and hints at web/cross-platform expansion via a "sidekit/ui-js" repository. Documentation references SwiftUI, UIKit, and React Native support.
GitHub commits suggest cross-platform (web/JS) expansion is underway. The open-source MIT-licensed SDK strategy may be a deliberate developer adoption play before monetization.
Privacy-first mobile app analytics that tracks custom events ("signals") without collecting personal user data by default.
It's like Google Analytics for your app, except it doesn't spy on your users.
It's like having a store counter that tells you how many people visited each aisle without ever asking for their name or following them home.
Remote version gating that lets developers force updates, block outdated app versions, or show dismissible upgrade prompts — all controlled from a web dashboard without shipping new code.
It lets you remotely force users to update their app so you never have to support that buggy old version again.
It's like being a bouncer at a club who can instantly change the dress code from the back office without walking to the door.
In-app messaging system that lets developers send targeted messages, announcements, and prompts to users directly within the app, managed remotely from the SideKit dashboard.
It's a way to pop up messages inside your app — like announcements or tips — without pushing a whole new update.
It's like having a bulletin board inside your app that you can update from your couch without calling the landlord.
A single lightweight SDK that replaces multiple third-party integrations (analytics, version management, messaging) for mobile developers, reducing dependency bloat and maintenance overhead.
Instead of gluing together five different tools, you install one tiny SDK and get analytics, update prompts, and messaging all in one.
It's like replacing your kitchen's separate blender, food processor, mixer, and juicer with one appliance that actually fits on the counter.
Lightweight app health monitoring using custom analytics signals to track version adoption, feature usage, and engagement trends — giving developers operational visibility without heavyweight observability platforms.
It shows you which app versions people are actually using and which features they care about, so you can make smarter decisions about what to build next.
It's like having a fitness tracker for your app — it won't diagnose diseases, but it'll tell you if your heart rate is off before you need the ER.
SideKit's "one SDK replaces many" approach with a privacy-first, open-source (MIT) model offers a lightweight alternative to Firebase's sprawling ecosystem, appealing to privacy-conscious indie developers and small teams.