ここりレビュー

Piper TTS is a lightweight, C++-based neural TTS system optimized for low-resource devices like Raspberry Pi, delivering fast inference with minimal hardware requirements.

Like Kokori, Piper runs locally without GPU needs and supports real-time speeds on CPUs, but lacks a dedicated macOS desktop app with menubar integration. Both are free and open-source, targeting users seeking efficient, self-hosted TTS solutions.

NaturalReader offers a cross-platform desktop TTS app with extensive voice options, custom lexicons, and audio optimization features for professional reading tasks.

NaturalReader provides a native Mac app similar to Kokori but uses cloud-based voices in its free tier, contrasting Kokori's fully local API server; pricing includes a $99.50 one-time payment option versus Kokori's freemium model. It appeals to a broader audience needing multi-language support and pitch/speed controls.

Speechify specializes in AI-powered text-to-speech with enhanced emotional inflection using proprietary engines on top of Apple, OpenAI, and Google voices, ideal for audiobooks and productivity.

Both target Mac users with desktop apps for seamless TTS, but Speechify emphasizes cross-platform mobile support and premium AI voices over Kokori's lightweight local server focus. Speechify is freemium like Kokori, though its advanced features require subscriptions for full access.