⚖️ Open-Source Transparency & Audio Stack

Built with Great Tools & Generous Open-Source Technology

WhoCaller relies on industry-leading open-source libraries, high-performance T9 search algorithms, and on-device neural models to deliver real-time spam defense, privacy-first local search, and seamless CRM synchronization. This page acknowledges and honors those projects and their licenses.

⚡ High-Speed T9 Search

Sub-millisecond T9 phonetic matching and FastCache LRU memory eviction for instant local contact lookup.

🧠 On-Device Neural AI

Whisper.cpp on-device acoustic models for speech-to-text voice memos with zero cloud audio leakage.

🔒 Cryptographic Local Storage

Hardware AES-256 KeyStore encryption and Room SQLite architecture to safeguard address books locally.

FFmpeg

Audio Stream Demuxing & Cross-Platform Transcoding

LGPL v2.1+ / GPL

FFmpeg is the leading multimedia framework capable of decoding, encoding, transcode, mux, demux, stream, filter and play pretty much anything that humans and machines have created.

🌐 https://ffmpeg.org/ ↗

FFmpeg is licensed under the GNU Lesser General Public License (LGPL) version 2.1 or later. Portions of optional code are licensed under the GNU General Public License (GPL) version 2 or later. This software uses libraries from the FFmpeg project under the LGPLv2.1.

LAME MP3 Encoding Engine

Acoustic Compression & High-Fidelity Audio Storage

LGPL / GPL Notice

LAME is a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL. WhoCaller utilizes LAME acoustic algorithms for compact, space-efficient voice recording storage while preserving voice clarity.

🌐 https://lame.sourceforge.io/ ↗

LAME is an educational tool to be used for learning about MP3 encoding. The goal of the LAME project is to use the open source model to improve the psycho acoustics, quality and speed of MP3 encoding. LAME is distributed under the GNU Lesser General Public License (LGPL).

OpenAI Whisper & Whisper.cpp

On-Device Neural Speech-to-Text & Transcription

MIT License

High-performance neural speech recognition engine created by OpenAI and ported for on-device C/C++ inference by Georgi Gerganov. Powers WhoCaller's automated call memo transcriptions directly on your smartphone.

🌐 https://github.com/ggerganov/whisper.cpp ↗

MIT License Copyright (c) 2022-2026 Georgi Gerganov & OpenAI Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Android Jetpack Compose & Material 3

Reactive UI Architecture & Component Framework

Apache 2.0

Modern Android declarative UI toolkit developed by Google. Powers WhoCaller's fluid, adaptive 60/120fps interface across all smartphone screen densities and aspect ratios.

🌐 https://developer.android.com/jetpack/compose ↗

Copyright (C) 2026 The Android Open Source Project Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

AOSP InCallService & AudioRecord Subsystem

Native Cellular Ingress & Dual-Voice Hardware Pipeline

Apache 2.0

Native Android telecom framework providing system-level default dialer capabilities, dual-SIM identification, real-time in-call HUD control, and low-latency audio stream ingress.

🌐 https://source.android.com/ ↗

Room Database & SQLite

Hardware-Encrypted Local Relational Data Engine

Apache 2.0 / Public Domain

High-performance embedded SQL database and Room abstraction layer providing zero-defect local caching, fast T9 indexing, spam pattern compilation, and encrypted call history storage.

🌐 https://www.sqlite.org/ ↗

SQLite is in the Public Domain. Android Room persistence library is licensed under the Apache License, Version 2.0.

Experience WhoCaller v7.2.9

Enjoy verified caller ID, privacy-first spam blocking, and on-device T9 search for free.

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