Third-party licenses
Last updated July 12, 2026
PayAppCheck is proprietary software. No license to PayAppCheck itself is granted on this page. It is built with the open-source components below; we acknowledge their copyright and license notices here with thanks. Full license texts are available at spdx.org/licenses.
Fonts
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Inter · © The Inter Project Authors · SIL Open Font License 1.1.
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Material Symbols · © Google · Apache License 2.0.
Web application
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React and React DOM · © Meta Platforms, Inc. and affiliates · MIT License.
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React Native and React Native Web · © Meta Platforms, Inc. / © Nicolas Gallagher · MIT License.
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Expo (expo-router and expo modules) · © 650 Industries, Inc. · MIT License.
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react-native-svg, react-native-screens, react-native-reanimated, react-native-gesture-handler, react-native-safe-area-context · © Software Mansion and contributors · MIT License.
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@microsoft/signalr · © Microsoft Corporation · MIT License.
Server
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ASP.NET Core and Entity Framework Core · © Microsoft Corporation · MIT License.
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ClosedXML (with DocumentFormat.OpenXml and ExcelNumberFormat) · MIT License.
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SixLabors.Fonts · © Six Labors · Apache License 2.0.
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PdfPig · © UglyToad · Apache License 2.0. Includes Adobe AFM font metrics under Adobe’s permissive license.
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Npgsql and Npgsql.EntityFrameworkCore.PostgreSQL · PostgreSQL License.
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Serilog · Apache License 2.0.
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Google.Apis.Auth · © Google LLC · Apache License 2.0.
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Swashbuckle.AspNetCore and Scalar.AspNetCore · MIT License.
PayAppCheck is software, not legal or tax advice. You review and confirm every number.