The extension is free to install, but you supply your own Google Cloud Text-to-Speech API key. Google provides a trial allotment and then bills per million characters, reported in the listing as roughly $16 USD per million characters per month.

Does it work without an API key?

No. Audio is synthesized through Google's WaveNet TTS API, so you need a Google Cloud account and API key. The listing notes the setup instructions are somewhat outdated, so you may need to locate the key page yourself.

Can I replay a sentence without paying again?

Yes. Left-clicking a sentence replays the cached audio, so no new request is sent to Google's API and no additional characters are billed.

Is it affiliated with Google or the original WaveNet extension?

No. It is an independent extension built by 'drbxho' that reworks Michael Poirier-Ginter's original WaveNet for Chrome code with attribution. It uses Google's TTS engine but is not a Google product.

BB WaveNet 的每月流量與成長趨勢為何？

BB WaveNet 目前每月有 0 次造訪，月流量變化為 +0（成長率 0.0%）。其主要來源市場為全球（佔比 —），其中包含每月 0 次直接造訪與每月 0 次自然搜尋造訪。

BB WaveNet 是免費的嗎？其定價模式為何？

BB WaveNet 採用免費增值定價模式。The extension itself is free to install, but it depends on your own Google Cloud Text-to-Speech (WaveNet) API key. Google's service is reported in the listing as offering a 90-day trial allotment and then charging around $16 USD per million characters per month. The developer also mentions an optional convenience service where they set up and maintain the Google platform for you at a markup comparable to app-store rates. 支援的帳務與結帳平台包括：未列出。

BB WaveNet — 月造訪量 (0/月)、定價、API 與替代方案

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排名	AI 工具	每月造訪次數	月增幅	直接流量占比	價格	正面對決
●	BB WaveNet	0	—	—	免費增值	目前產品
1	Voice Out	3.97萬	-27.1%	71% 直接流量	免費增值	對比 Voice Out
2	GPT Reader & Transcriber	3萬	-16%	76% 直接流量	免費	對比 GPT Reader & Transcriber
3	TTSMaker	115.88萬	+6.8%	44% 直接流量	免費增值	對比 TTSMaker
4	Wavenet for Chrome	0	—	—	付費	對比 Wavenet for Chrome
5	Web Whisper	862	-68.7%	41% 直接流量	免費	對比 Web Whisper
6	Liso	2388	+52.4%	31% 直接流量	免費增值、免費試用	對比 Liso