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 The listing notes the setup instructions are somewhat outdated, so you may need to locate the key page yourself.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 的月流量和增长趋势如何？

BB WaveNet 目前每月获得 0 访问量，月度环比流量变化为 +0（增长率 0.0%）。其主要来源市场是全球（— 份额），包括每月 0 次直接访问和每月 0 次自然搜索访问。

BB WaveNet 免费吗？它的定价模式是什么？

BB WaveNet 采用免费增值定价模式。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. 支持的计费和结账平台包括：未列出。

BB WaveNet — 月访问量 (0/月)、定价、API 与平替对比

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排名	AI 工具	月访问量	月度环比增长	直接流量占比	定价	头对头
●	BB WaveNet	0	—	—	免费增值	当前产品
1	Voice Out	3.97万	-27.1%	71% 直接流量	免费增值	对比 Voice Out
2	GPT Reader & Transcriber	3万	-16%	76% 直接流量	免费	对比 GPT Reader & Transcriber
3	TTSMaker	115.88万	+6.8%	44% 直接流量	免费增值	对比 TTSMaker
4	Wavenet for Chrome	0	—	—	付费	对比 Wavenet for Chrome
5	Web Whisper	862	-68.7%	41% 直接流量	免费	对比 Web Whisper
6	Liso	2388	+52.4%	31% 直接流量	免费增值，免费试用	对比 Liso