These are the open-source components included in the iPhone version of the Helvetalk app (identifier com.helvetalk.app), published by Navritto Solutions Private Limited, and the licence each is used under. How you may use the app itself is set out in its terms of use.
1. Fonts
Helvetalk sets its text in one open-source typeface, used under the SIL Open Font License, Version 1.1:
Inter
Copyright 2016 The Inter Project Authors (https://github.com/rsms/inter), with the reserved font name “Inter”. Used under the SIL Open Font License, Version 1.1.
The full SIL Open Font License, Version 1.1 is available at https://openfontlicense.org.
2. Frameworks and libraries
The iPhone version is built with the following open-source frameworks and libraries, each used under the Apache License, Version 2.0:
- Kotlin, its standard library and the Kotlin Multiplatform toolchain — © JetBrains s.r.o. and contributors
- Compose Multiplatform, including its Material 3 components and the Material icons — © JetBrains s.r.o. and The Android Open Source Project
- Lifecycle and Navigation for Compose, and the DataStore preferences store — © JetBrains s.r.o. and The Android Open Source Project
- kotlinx.coroutines — © JetBrains s.r.o. and contributors
- kotlinx.serialization — © JetBrains s.r.o. and contributors
- Okio, the storage library used by DataStore — © Square, Inc.
- Skiko, the graphics engine that draws the Compose Multiplatform interface on this platform — © JetBrains s.r.o.
The full Apache License, Version 2.0 is available at https://www.apache.org/licenses/LICENSE-2.0.
3. Skia
Compose Multiplatform draws through Skia, the open-source 2D graphics library, used under the BSD 3-Clause License:
Skia
Copyright © Google Inc. Used under the BSD 3-Clause License, whose text is available at https://opensource.org/license/bsd-3-clause.
Recording and playing audio, speech recognition, text-to-speech, reminders and the optional subscription use the operating system's own built-in frameworks, which require no attribution.
Helvetalk's own code and content
Helvetalk's own source code, design, brand and practice material are owned by Navritto Solutions Private Limited or used under licence, and are not covered by the licences above. Their use is governed by the Terms of Use. Beyond the components listed here, the app is built on the operating system's own built-in frameworks — including those for recording and playing audio, speech recognition, text-to-speech and the optional subscription — which require no attribution.