Apache-2.0 open source · Pre-alpha

The open-source way to
build
in-app subscriptions

Subkit is building portable, self-hostable infrastructure for in-app subscriptions. The public core is available for early evaluation; store integrations, SDKs, and managed Cloud remain in development.

Public, inspectable Core foundation
Privacy-First & Self-Hostable
Join the Cloud waitlistExplore Subkit CoreContact sales
Planned SDK targets
iOSAndroidFlutterReact Native
event_flow_conceptPreview
Monthly Recurring Revenue (MRR)$14,250.00
Simulated Event Flow
12:04:15Event accepted
12:04:12Delivery queued
12:03:55State updated
12:03:10Customer record linked
Sovereign Architecture

Easy Implementation, Sovereign Power

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

Portable Product Model

A planned, versioned model for products, offerings, and entitlements that can run on infrastructure you control.

Open SDK Direction

Native and cross-platform SDKs are planned as public, auditable clients of a stable SDK Runtime contract.

EU Digital Sovereignty

Self-hosting can support data-residency and processor-control strategies when paired with appropriate operational and legal safeguards.

Full Data Ownership

The Apache-2.0 Core foundation is designed for portable operation with documented data stores, migrations, and OCI-compatible container packaging.

Auditable Subscription State

The roadmap separates immutable store events from derived subscription and entitlement state for traceable reconciliation.

Reliable Event Processing

The early Event Inbox foundation supports deduplication, worker claims, completion, and retry across portable storage adapters.

Product Direction

An Open Subscription Stack, Built in Public

Build

Stable SDK Contracts

Subkit Core is establishing separate public SDK, authenticated operator, and private operational contracts.

Native SDKs and production purchase flows are planned. Current work focuses on the runtime model, entitlement reads, and reliable store-event foundations.

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

Auditable Subscription State

PostgreSQL is planned as the authoritative source for subscription and entitlement state, with raw events retained through a provider-neutral inbox.

Analytics, customer timelines, and store-specific reconciliation remain roadmap capabilities and will be published as they become testable.

Review the Roadmap
Grow

Event Delivery

The early Event Inbox supports deduplication and recoverable worker processing across libSQL-compatible and PostgreSQL adapters.

Outbound webhooks and third-party integrations are planned after store-event reconciliation and delivery guarantees are established.

Explore Event Foundations
Core
Stripe
Slack
Adjust
Webhooks
Planned Positioning

Where Subkit Is Heading

Subkit is pursuing a portable, open-source subscription stack spanning Apple and Google validation, customer operations, analytics, LTV reporting, paywalls, and event delivery. The table separates today's pre-alpha foundation from planned capabilities and established managed products.

High-level positioning of Subkit, RevenueCat, Adapty, and Superwall.
CapabilitySubkit Pre-alpha / plannedRevenueCatAdaptySuperwall
Operating modelSelf-hosted Core foundation; managed Cloud plannedManaged serviceManaged serviceManaged service
Self-hosted backendApache-2.0 Core (pre-alpha)Not offered in public product documentationNot offered in public product documentationNot offered in public product documentation
Apple receipt validationPlannedAvailableAvailableAvailable
Google Play validationPlannedAvailableAvailableAvailable
Client SDKsSwift, Kotlin, Flutter, and React Native plannedAvailableAvailableAvailable
Customer details / CRM viewPlanned dashboard with identity, entitlement, and event historyAvailableAvailableAvailable
Subscription analyticsRevenue, churn, retention, and cohort analytics plannedAvailableAvailableAvailable
LTV trackingRealized LTV and cohort reporting plannedAvailableAvailableAvailable
Paywalls and experimentsRoadmapAvailableAvailableCore product focus
Events and outbound webhooksDurable Event Inbox foundation; outbound delivery plannedAvailableAvailableAvailable

Positioning snapshot reviewed July 2026 from public vendor documentation. Product capabilities change; verify vendor documentation before making a technical or purchasing decision. Planned Subkit work is not a delivery commitment.

Open Infrastructure Roadmap

Our Vision for the
Future of Subscriptions

Subkit is building its foundations in public. Explore the planned sequence from a portable Core runtime to store integrations, SDKs, managed operations, and privacy-conscious product tooling.

Phase 1Q3 2026

Core Sovereign Infrastructure

PostgreSQL domain foundations, event processing, public contracts, and production store-validation research.

Phase 2Q4 2026

Remote Paywalls & Configuration

Planned JSON-driven configuration and paywall delivery, subject to implementation and validation.

Phase 3Q1 2027

Privacy-Conscious Experimentation

Planned local experimentation and reporting with explicit data-retention and compliance controls.

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 early open-source foundation for portable mobile subscription infrastructure. The current Core includes runtime, data-model, contract, and durable Event Inbox foundations; production receipt validation, lifecycle reconciliation, SDKs, and outbound webhooks remain roadmap work.
Subkit is pursuing a portable, open-source alternative to proprietary subscription infrastructure. The current repository is an early Core foundation; production store integrations, SDKs, paywalls, analytics, and managed Cloud capabilities are roadmap work.
Subkit has submitted a European open-source funding application and is awaiting review. Its goals overlap with NGI themes such as openness, privacy, user control, and resilient digital infrastructure. The pending application does not imply selection, funding, endorsement, or support by NGI.
Not yet. Remote paywall configuration and locally processed experimentation are roadmap items. Their final interfaces and delivery dates are not guaranteed during the pre-alpha phase.
Subkit Core is licensed under Apache-2.0 and can be evaluated through its Compose reference deployment or run directly with Node.js and PostgreSQL. Containers are a supported packaging path, not a product requirement. Operators remain responsible for infrastructure, security, backups, upgrades, and compliance. The project is pre-alpha and not ready for production subscription decisions.
Production Apple App Store and Google Play integrations are planned but not implemented. Planned SDK targets include Swift, Kotlin, Flutter, and React Native. Stripe and additional providers will be evaluated after the core store lifecycle is reliable.
Subkit Cloud is planned for teams that prefer managed upgrades, backups, monitoring, and support. Pricing, regions, service levels, and availability commitments have not been finalized. Joining the waitlist does not create a service or uptime commitment.