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Credits

Acknowledgements

Our apps stand on a lot of shoulders. This page names the open-source software, frameworks, and services that DeadStick Digital's apps and website rely on. Each project's own license governs how it may be used; the license texts are reproduced in-app under Settings → About → Licenses. If we've forgotten anyone, please let us know and we will correct it.

Last updated: July 13, 2026

Contents

  1. BillingBird
  2. CarrierPigeonVPN
  3. Document Vault
  4. Holos Drive Vault
  5. Website
  6. Typography & type
  7. Trademarks & service marks
  8. Corrections & contact
A note on completeness. The list below names the major frameworks and libraries used by each app at release. Each app bundles a full license file in-app under Settings → About → Licenses that enumerates every transitive dependency with its SPDX identifier and copyright notice; this page is the human-readable summary.

1. BillingBird

BillingBird uses React Native, Expo, and Apple platform services to deliver a private invoicing workflow launching first on iPhone. iPadOS, macOS, Android, and Windows support is planned:

  • React Native 0.85.3 (Fabric / TurboModules) — MIT License. © Meta Platforms, Inc. and affiliates.
  • Expo SDK 56 and the Expo modules ecosystem — MIT License. © 650 Industries, Inc. and contributors.
  • React — MIT License. © Meta Platforms, Inc. and affiliates.
  • Apple CloudKit and iCloud, used for optional private backup through the user's own Apple account on the iPhone launch.
  • On-device receipt capture through Apple Vision and VisionKit on iPhone.
  • Apple PDF services for PDF rendering and export on iPhone.
  • RevenueCat services may be used to check subscription entitlements separately from BillingBird bookkeeping records.

2. CarrierPigeonVPN

CarrierPigeonVPN's tunnel is built on the WireGuard protocol and its reference implementations. The cryptographic primitives, key exchange, and the two mobile tunnel providers are made possible by:

  • WireGuard — "WireGuard" and the "WireGuard" logo are registered trademarks of Jason A. Donenfeld. The protocol is the foundation of this app.
  • wireguard-go — the userspace WireGuard implementation in Go, MIT License. © Jason A. Donenfeld.
  • wireguard-apple and wireguard-android — the Apple-platform and Android reference clients, MIT License. © Jason A. Donenfeld.
  • Apple's Network Extension framework (NEPacketTunnelProvider) and Android's VpnService API — the platform primitives without which none of this would be possible.

CarrierPigeonVPN is an independent product and is not endorsed by, affiliated with, or sponsored by the WireGuard project or Mr Donenfeld.

3. Document Vault

Document Vault is a native document scanning and storage app. Its Apple implementation is built on system frameworks and a small set of local-first storage, OCR, and PDF boundaries:

  • Swift and SwiftUI — the language and UI framework for the Apple app surface.
  • VisionKit, Vision, and Core Image — Apple frameworks used for document camera capture, rectangle detection, perspective correction, image enhancement, and on-device OCR.
  • PDFKit — Apple framework used for local PDF assembly and page-level PDF operations.
  • SwiftData and CryptoKit — Apple frameworks used for local document-library metadata and content identity.
  • Kotlin, Jetpack Compose, Room, CameraX, Google ML Kit, and Google Drive appDataFolder APIs are planned for the Android implementation.

4. Holos Drive Vault

Holos Drive Vault is a native encrypted-drive utility with Apple-platform and Windows companion components. Major platform and open-source building blocks include:

  • Swift, SwiftUI, and Charts for the macOS drive-management interface.
  • Apple's Security framework and LocalAuthentication for Keychain storage and Touch ID / Face ID / device-owner authentication flows.
  • Apple's APFS, Disk Utility, and diskutil command-line tooling for encrypted external-drive setup.
  • .NET Worker Services, Windows Credential Manager APIs, and Windows WMI event watching for planned Windows companion behavior.
  • WinFsp and a local APFS bridge for planned user-mode mounted-drive access on Windows.
  • LZFSE compression support, used within the local APFS parsing boundary.

5. Website

www.deadstick.net is a hand-written static site served from GitHub Pages. It relies on:

  • GitHub Pages for hosting, served through Cloudflare for TLS and edge caching.
  • Web3Forms — delivers submissions from the contact form to our inbox. Processing is covered by Section 5 of our privacy policy.
  • hCaptcha — bot protection on the contact form. © Intuition Machines, Inc.

6. Typography & type

The system font stack (SF Pro on Apple platforms, Segoe UI Variable on Windows, Roboto on Android) is used throughout, with no custom webfonts loaded from third parties. This keeps our pages fast and keeps your browser from making extra requests you did not ask for.

7. Trademarks & service marks

Apple, the Apple logo, iPhone, iPad, Mac, macOS, and Apple Silicon are trademarks of Apple Inc., registered in the U.S. and other countries and regions. App Store is a service mark of Apple Inc. Google Play and the Google Play logo are trademarks of Google LLC. Android is a trademark of Google LLC. WireGuard is a registered trademark of Jason A. Donenfeld. All other product and company names mentioned on this page may be trademarks of their respective owners; their use here is purely for identification and does not imply endorsement.

8. Corrections & contact

If a project has been misattributed, a license identifier is wrong, or a dependency has been left out, please send a note through the contact form (topic: Something else) and we will correct this page in the next deployment. If you are a rights-holder and wish to be named differently — or not at all — we will honour that.