Acknowledgements

HeyU is built with the help of the open-source community and a handful of third-party platforms. We're grateful to the people and projects behind them.

This page lists the third-party software in the HeyU app and its backend, with the licence each is used under. Where a licence asks for its notice to be reproduced, you'll find it below.

In the app (iOS)

Open source

• Firebase Apple SDK (Authentication, Cloud Firestore, Cloud Storage, Cloud Functions, Cloud Messaging, App Check, Crashlytics, Performance Monitoring): Apache License 2.0.
• Google Sign-In for iOS, with AppAuth, GTMAppAuth and GTM Session Fetcher: Apache License 2.0.
• GoogleUtilities, GoogleDataTransport, App Check Core, Promises and Interop for Google SDKs: Apache License 2.0.
• gRPC and Abseil: Apache License 2.0.
• BoringSSL, bundled with gRPC: OpenSSL, ISC and Apache 2.0 licences.
• LevelDB: BSD 3-Clause License.
• nanopb: zlib License.

Google SDKs used under Google's terms

• Google Mobile Ads SDK (AdMob), for ads, and Google User Messaging Platform, for ad consent choices: Google's terms for these SDKs.
• Google Analytics for Firebase, including Google's on-device conversion measurement component. Only active if you turn on Share Data for Improvements: Firebase terms.

In the backend (Cloud Functions)

• Firebase Admin SDK: Apache License 2.0.
• Cloud Functions for Firebase SDK: MIT License.
• Google Cloud Vision client, for automated photo checks: Apache License 2.0.
• Apple App Store Server Library, for verifying App Store purchases and notifications: MIT License.

On the website

• Inter and Inter Tight: SIL Open Font License 1.1.
• Geist and Geist Mono: SIL Open Font License 1.1.

Licence texts

• Apache License 2.0
• MIT License
• BSD 3-Clause License
• zlib License
• ISC License
• OpenSSL License
• SIL Open Font License 1.1

Notices

LevelDB

Copyright (c) 2011 The LevelDB Authors. All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of Google Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

nanopb

Copyright (c) 2011 Petteri Aimonen.

BoringSSL

This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit (openssl.org). This product includes cryptographic software written by Eric Young (eay@cryptsoft.com).

Thank you

Open source makes HeyU possible. If you maintain one of the projects above: thank you. Questions about attribution? Email support@shadowparticle.com.