NotebookLM API Alternatives: Build AI Podcasts Into Your Product
Google launched NotebookLM Enterprise API in alpha. But it’s enterprise-only, pricing isn’t public, and access is restricted. If you’re a developer wanting to build podcast generation into your product, here are your options.
The APIs Available Today
ElevenLabs Text-to-Dialogue API
- Endpoint:
/v1/text-to-dialogue - Speakers: Up to 10 unique voices per generation
- Quality: Best in the industry
- Pricing: $0.06-0.12 per 1,000 characters
- Languages: 32
- Docs: elevenlabs.io/docs
Google Gemini TTS API
- Model: Gemini 2.5 Flash/Pro TTS
- Speakers: Up to 2 per generation (multi-speaker mode)
- Quality: Natural, with emotion and style control via prompts
- Pricing: $0.08 per 1K input chars + output token pricing
- Languages: 100+
- Docs: ai.google.dev/gemini-api/docs/speech-generation
Wondercraft API
- Endpoint: api.wondercraft.ai/v1
- Speakers: Multiple
- Quality: Good, with 1,000+ voice options
- Pricing: Credit-based, starting at $25/mo
- Languages: Multiple
AutoContent API
- Position: “NotebookLM API Alternative”
- Pricing: EUR 24-166/mo, ~EUR 0.24 per podcast
- Quality: Purpose-built for document-to-podcast
- Docs: autocontentapi.com
Open Source
- Dia (Nari Labs) — multi-speaker conversations with nonverbal sounds
- VibeVoice — up to 4 speakers, designed for podcasts
- ChatTTS — conversational dialogue synthesis
The Build vs. Buy Decision
Building a podcast generation pipeline requires:
- Content extraction — parsing URLs, PDFs, documents
- Script generation — turning content into a multi-speaker dialogue (the hard part)
- Voice synthesis — generating natural audio
- Audio post-processing — normalization, music, intros
The APIs above handle step 3. You still need steps 1, 2, and 4.
If you want the full pipeline without building, audiclip handles all four steps — but it’s a product, not an API (yet).
Pricing Comparison
| API | Price per ~10 min podcast | Languages | Multi-speaker |
|---|---|---|---|
| ElevenLabs | ~$2-4 | 32 | Up to 10 |
| Gemini TTS | ~$1-2 | 100+ | Up to 2 |
| AutoContent | ~$0.24 | Limited | Yes |
| Wondercraft | Credit-based | Multiple | Yes |
| NotebookLM Enterprise | Unknown | English-focused | 2 |
Need the full pipeline, not just TTS? Talk to us →