Next Generation Internet (NGI) Supported Open-Source Project

The open-source way to
build
in-app subscriptions

Subkit is the privacy-first alternative to proprietary tools. Run it on our fully-managed Cloud or self-host on your own infrastructure with 100% data ownership.

100% Open-Source SDKs & Core
GDPR Compliant & Privacy-First
Deploy Self-HostedContact sales
Supported Platforms & Frameworks
iOSAndroidFlutterReact NativeCordovaUnity
billing_live_streamLive
Monthly Recurring Revenue (MRR)$14,250.00
Real-time Event Logs
12:04:15Subscription created
$19.00/mo
12:04:12Stripe webhook received
12:03:55Invoice paid
$49.00
12:03:10Customer activated
Sovereign Architecture

Easy Implementation, Sovereign Power

Spend time building your core product features, not an intricate, proprietary subscription backend.

Remote Product Configuration

Organize and configure paywalls, active products, and offerings remotely to bypass long app store release cycles.

One-Line SDK Integration

Deploy faster. Subkit's unified native SDKs cut complex subscription integration time from months to mere hours.

EU Digital Sovereignty

100% GDPR compliant. Store all transaction and subscriber logs in secure EU clouds or your own dedicated server.

Full Data Ownership

Deploy self-hosted in minutes using Docker. Zero vendor lock-in. Keep complete, unfiltered access to all raw SQL data.

Granular Customer Timelines

Understand each user. Explore granular histories showing purchases, active trials, promotional grants, and device metadata.

Real-time Webhook Engine

Instantly broadcast billing event payloads (renewals, cancels, churn) to your servers or active integrations.

Our Platform

In-App Subscriptions Made Easy

Build

Open Source SDKs

With Subkit you can build a customized mobile subscription business in hours, not months.

Host and configure products using our dashboard and fetch products, make purchases, and check subscription status using our native SDKs.

View the Docs
Product Configuration
Active
com.subkit.pro.monthly
Monthly Recurring
7 Days Free
Pricing ($)$9.99 / mo
MRR$14,250+12.4%
Churn2.4%-0.8%
LTV$84.20+4.2%
Monthly Revenue Distribution
Analyze

Subscription Insights

Get insights into your data with a single source of truth for your app. Monitor MRR, trials, churn rate, cohorts, and more.

Understand your customers like never before with real-time metrics support for Apple App Store, Google Play, and Stripe.

Explore the Dashboard
Grow

Data Integrations

Subkit makes it easy to send enriched subscription events to services like Slack, Stripe, AppsFlyer, Branch, Adjust, and many more.

Use revenue and LTV data to optimize ad spend, improve attribution, and get a deeper understanding of how customers use your app.

See Our Integrations
Core
Stripe
Slack
Adjust
Webhooks
Digital Sovereignty

Break Free from Proprietary Lock-in

Compare Subkit with proprietary third-party platforms and native app store solutions.

Cross-platform support

Support for iOS, Android, Flutter, React Native, and Web purchases out-of-the-box.

Subkit

RevenueCat

Apple/Google

Data Sovereignty (Self-Hosted)

Deploy on your own infrastructure to keep 100% ownership of your data and customer transactions.

Unique

Subkit

RevenueCat

Apple/Google

100% Open-source Core

Fully open-source backend, dashboard, and SDKs. Inspect, modify, and run without vendor lock-in.

AB Supported

Subkit

RevenueCat

Apple/Google

GDPR & EU Digital Sovereignty

Host in the EU or self-host. No transmission of customer transaction data to third-party US proprietary clouds.

Subkit

RevenueCat

Apple/Google

Complex

Receipt validation

Real-time cryptographically secure verification of App Store, Google Play, and Stripe receipts.

Subkit

RevenueCat

Apple/Google

Native Only

Real-time webhooks

Instant event notifications sent to your backend for purchases, renewals, trials, and churn.

Subkit

RevenueCat

Apple/Google

Limited

Analytics & LTV tracking

Pre-computed cohort analysis, MRR growth, active trials, and real-time revenue streams.

Subkit

RevenueCat

Apple/Google

Limited

Customer Details & CRM

Explore individual customer timelines, subscription states, purchase history, and device info.

Subkit

RevenueCat

Apple/Google

EU Digital Sovereignty Roadmap

Our Vision for the
Future of Subscriptions

We are not just replicating proprietary billing tools. We are designing a fully transparent, federated monetization ecosystem. Explore our detailed plan to replace RevenueCat and Adapty with a sovereign, open-source standard.

Phase 1Q3 2026

Core Sovereign Infrastructure

PostgreSQL core receipt verification API & Native SDK deployments.

Phase 2Q4 2026

Remote Paywalls & Configuration

JSON-driven paywalls & remote price changes without App Store releases.

Phase 3Q1 2027

Privacy-First A/B Testing & AI

Local GDPR A/B testing & lifetime value predictions on sovereign DBs.

Support & Knowledge

Frequently Asked Questions

Get instant answers to the most common questions about Subkit's open-source architecture, hosting, and privacy.

Subkit is an open-source in-app subscription and billing infrastructure for mobile apps. It acts as a unified hub to manage product catalog offerings, cryptographically validate receipts, track customer subscription lifecycles, and broadcast billing events via real-time webhooks.
Subkit provides the receipt validation and subscription state management of RevenueCat, combined with the remote paywall configuration capabilities of Adapty and Superwall. The key difference is that Subkit is 100% open-source and self-hostable, eliminating expensive growth taxes (revenue percentage commissions) and proprietary vendor lock-in.
Subkit is designed in strict alignment with the European Commission's NGI core values: digital sovereignty, user-first privacy, open-source transparency, and decentralized resilience. By allowing businesses to self-host their billing pipeline, we ensure sensitive purchase metadata never leaves European borders, upholding strict GDPR compliance by default.
Yes! Subkit's architectural roadmap includes JSON-driven dynamic paywalls and GDPR-compliant local A/B testing. This allows you to remotely customize paywall price offerings and run experiments directly on your own PostgreSQL database without sending end-user events to proprietary US analytics clouds.
Yes, the self-hosted community core is 100% open-source and free forever. You can easily deploy it on any VPS, cloud instance, or bare-metal server using our simple Docker Compose setups, gaining absolute data sovereignty and unlimited scale at zero licensing cost.
Subkit natively coordinates purchases, subscription state, and receipt validation across Apple App Store, Google Play Store, and Stripe out-of-the-box. Our unified, zero-dependency SDKs support iOS Swift, Android Kotlin, Flutter, and React Native frameworks with zero impact on app boot performance.
While the self-hosted version has 100% of the core features, you are responsible for server maintenance, database backups, security patches, and scaling. The managed Subkit Cloud tier handles all operational overhead for you, ensuring 99.99% uptime on sovereign EU clouds, automated backups, globally distributed low-latency endpoints, and priority developer support.