Cheaper Starter plan at $6/month with 10,000+ voices (vs. Narration Box's 1,500+) and a free tier of 10,000 credits (vs. 1,000 words), plus Pro-tier API output at 44.1kHz PCM and up to 192 kbps via Studio.
Best for: Narration Box Plus users paying $15/month for watermark-free exports who want the same multi-format output at $6/month with a far larger voice library — and who'll benefit from 10x the free-tier credits before hitting a paywall.