Offline-First AI Voice Input for macOS Hold a key. Speak. Auto-type.
A macOS desktop app that turns your voice into text — offline by default, with optional cloud enhancement. Press a hotkey, speak naturally, and text appears at your cursor. Supports 11 languages, real-time translation, and AI-powered text polishing.
Works 100% offline with production-quality results. No account, no API key, no internet required. Just install, download a model, and start speaking. Cloud features (AI polish, translation, cloud ASR) are optional enhancements — the core voice input experience is fully local.
Core principles: privacy first (audio never leaves your device in offline mode), low latency (sub-second response), and zero configuration (works out of the box).
| Offline Mode | Smart Mode | Cloud Mode | |
|---|---|---|---|
| ASR Engine | Sherpa-ONNX (local) | Sherpa-ONNX (local) | Cloud ASR (Groq, DashScope, etc.) |
| AI Polish | — | LLM correction + translation | — |
| Privacy | 100% offline | ASR offline, LLM via cloud | Audio sent to cloud |
| Latency | Fastest | +0.5~1s for LLM | Depends on network |
- 8 Offline Models — SenseVoice, Paraformer, Whisper Large-v3, FireRedASR, and more
- Two Trigger Modes — Hold to Speak (PTT) or Tap to Toggle
- Streaming & Offline — Real-time subtitles while speaking, or higher accuracy after release
| Languages | Input | Output | Translation |
|---|---|---|---|
| Chinese, English, Japanese, Korean, Cantonese | All modes | All modes | — |
| Spanish, French, German, Russian, Portuguese | Whisper / Cloud | Smart Mode | Via LLM |
- Auto-detect — Let the model detect what language you're speaking
- Translation Mode — Set different input/output languages (e.g., speak Chinese → output English). Requires Smart Mode.
- Script Control — Choose Simplified or Traditional Chinese output
| Provider | Protocol | Highlights |
|---|---|---|
| DashScope (Aliyun) | WebSocket | Paraformer realtime, Chinese optimized |
| Groq | REST (Whisper) | Fast, 99 languages |
| OpenAI | REST (Whisper/GPT-4o) | Most accurate multilingual |
| Volcengine (ByteDance) | WebSocket (binary) | Seed-ASR, highest Chinese accuracy |
| iFlytek | WebSocket | 202 dialects |
| Tencent Cloud | WebSocket | 5h/month free |
LLM post-processing: fix homophones, remove filler words, translate, enforce output language.
- 12 LLM Providers — DashScope, DeepSeek, Volcengine, OpenAI, Anthropic, Zhipu, Kimi, MiniMax, Gemini, iFlytek, Groq, Ollama (local)
- Professional Vocabulary — Industry dictionaries (Tech/Medical/Legal/Finance/Education) + personal dictionary
- Typewriter Mode (Alpha) — Stream LLM output character by character to cursor
Capture thoughts without switching apps.
- Dedicated Hotkey — Hold to speak, release to auto-save
- Daily Markdown — Timestamped entries in
YYYY-MM-DD.md - Custom Directory — Choose where notes are stored
- Bluetooth Detection — Auto-detects headset connect/disconnect
- Device Selection — Choose preferred mic in settings
- Download
SpeakOut.dmgfrom Releases - Drag to
/Applications - First launch:
xattr -cr /Applications/SpeakOut.app(required until Developer ID signing) - Grant permissions: Input Monitoring, Accessibility, Microphone
- Follow the onboarding wizard to download a voice model
- macOS 13+ (Ventura or later)
- ~230MB for default model, up to ~1.4GB for Whisper/FireRedASR
| Model | Languages | Size |
|---|---|---|
| Zipformer Bilingual | Zh/En | ~490MB |
| Paraformer Streaming | Zh/En | ~1GB |
| Model | Languages | Size | Notes |
|---|---|---|---|
| SenseVoice 2024 | Zh/En/Ja/Ko/Yue | ~228MB | Default, built-in punctuation |
| SenseVoice 2025 | Zh/En/Ja/Ko/Yue | ~158MB | Cantonese enhanced |
| Paraformer Offline | Zh/En | ~217MB | Mature & stable |
| Paraformer Dialect | Zh/En + Sichuan | ~218MB | Dialect support |
| Whisper Large-v3 | 99 languages | ~1.0GB | Best multilingual |
| FireRedASR Large | Zh/En + dialects | ~1.4GB | Highest capacity |
Hotkey → native_input.m (CGEventTap)
→ C Ring Buffer (16kHz PCM)
→ CoreEngine FFI polling
→ ASR (8 offline models / 6 cloud providers)
→ LLM polish + translation (optional, 12 providers)
→ Clipboard paste to active app
| Layer | Path | Description |
|---|---|---|
| Engine | lib/engine/ |
CoreEngine, ASR providers, model management |
| Service | lib/services/ |
Config, LLM, billing, diary, audio devices |
| UI | lib/ui/ |
macOS-native UI (macos_ui), settings, overlay |
| Native | native_lib/ |
Objective-C: CGEventTap + AudioQueue ring buffer |
| Gateway | gateway/ |
Cloudflare Workers (Hono): license, billing, version check |
Codebase: ~29,000 lines across 86 files. 531 tests.
flutter pub get # Dependencies
flutter analyze # Static analysis (0 issues)
flutter test # Run tests (531 tests)
flutter build macos --release # Build
./scripts/install.sh # Install to /Applications
./scripts/create_styled_dmg.sh # Create DMG
# Native library (after modifying native_input.m)
cd native_lib && clang -dynamiclib -framework Cocoa -framework Carbon \
-framework AVFoundation -framework AudioToolbox -framework CoreAudio \
-framework Accelerate -o libnative_input.dylib native_input.m -fobjc-arc- Offline Mode — Audio never leaves your device
- Credentials — API keys stored in macOS Keychain (flutter_secure_storage)
- Logging — User speech content never logged by default; developer mode only records metadata
- Independent Review — Passed 4 rounds of independent third-party security review
Copyright © 2026 Leon. All Rights Reserved.
- 完全离线可用 — 无需账号、无需联网、无需 API Key，安装即用。8 款本地模型基于 Sherpa-ONNX，中英识别准确率媲美云端，音频不出设备
- 11 种语言 — 中英日韩粤 + 西法德俄葡，支持自动检测和实时翻译
- 三种工作模式 — 纯离线（隐私优先）/ 智能（离线识别 + AI 润色）/ 云端（高精度）
- 6 家云端 ASR — 阿里云百炼、Groq、OpenAI、火山引擎、讯飞、腾讯云
- 12 家 LLM — 百炼、DeepSeek、豆包、OpenAI、Claude、智谱、Kimi、MiniMax、Gemini、讯飞、Groq、Ollama 本地
- 闪念笔记 — 独立热键，语音直接保存为 Markdown
- 专业词汇 — 行业词典 + 个人词库，术语注入 LLM 实现领域感知
- 安全存储 — API 密钥存入系统 Keychain，通过独立第三方安全评审
- 从 Releases 下载
SpeakOut.dmg - 拖到
/Applications - 首次启动前：
xattr -cr /Applications/SpeakOut.app - 授权：输入监控、辅助功能、麦克风
- 按引导下载语音模型即可使用
系统要求：macOS 13+，磁盘空间 230MB ~ 1.4GB（取决于模型选择）
