Open source studio · Seoul

Open Source & Software Productivity

Experimenting with diverse software products and researching ways to improve developer productivity through open source development.

4K+
GitHub stars
6
framework SDKs
5
stores, one contract
specOpenIAPbackendIAPKitexpoexpo-iapreactrn-iapdartflutterkotlinkmp-iap.netmaui-iapgodotgodot-iapstorekitappleplaygoogleopen source studiohyo.dev

Open source we maintain

Backed by
MetaAmazon Developer

Open source

Focus on Open Source

We mainly focus on opensourcing, contributing to projects that solve platform quirks and improve developer productivity.

OpenIAP

OpenIAP

One API for every store

openiap.devGitHub

Working on OpenIAP to create unified standards for In-App Purchase APIs, focusing on creating consistent and developer-friendly IAP implementations across different platforms.

Stores covered

Native core

Framework SDKs

Open-source support

Backed by Meta and Amazon

Meta and Amazon Developer sponsor OpenIAP — funding the maintenance, testing, and shared infrastructure behind one purchase contract for every store.

Angel sponsor
Meta

Meta

Angel sponsor
Amazon Developer

Amazon Developer

Where the support goes

View sponsorship options
  • Real-device testing
  • Shared IAPKit capacity
  • Store change response
  • SDK parity

Track record

Our Journey

References

We have discovered and contributed to various open source projects, influencing many startups. We've grown developer communities and developed through quality, collaboration, and continuous learning. Participating as a Linux Foundation Speaker, we collaborate with global developers for communication and growth, and our major open source projects have received official sponsorship from Meta and Amazon.

Open Source Contributions

Managing open source projects whenever possible, sharing knowledge and expertise with the community.

GitHub

Community Leadership

Running a developer community, focusing on sharing technology, and working to build developer relations.

Community

What we ship

One product

Everything we learn maintaining OpenIAP ships into a single purchase backend.

IAPKit

IAPKit

The OpenIAP purchase backend

Purchase validation and entitlement infrastructure for the OpenIAP ecosystem — open source, with a hosted dashboard.

  • Open source
  • Hosted service
  • Free for developers
kit.openiap.devGitHub

Where it sits

Your app
IAPKitVerify · Entitle · Notify
Store ecosystems

App Store · Google Play · Amazon Appstore · Meta Horizon · Vega OS

  1. 01

    Purchase verification

    Server-side receipt validation for every store.

  2. 02

    Entitlements

    Subscription state tracked from store lifecycle events.

  3. 03

    MCP operations

    Your coding agent creates and syncs store products.

  4. 04

    Revenue visibility

    MRR, churn, and refunds from connected notifications.

Selective engagements

Consulting

While not our main focus, we provide consulting services to select partners. Hyo Dev provides expertise in the following areas:

  • Mobile & Web Development
  • Technology Strategy Planning
  • Team Mentoring

Get in touch

Contact Us

Want to discuss a project or learn more about our products? Get in touch.

Reach Out
hyo@hyo.dev
hyo.dev — Open Source & Software Productivity