Amazon Polly vs iSpeech

Amazon Polly converts text to speech through a web interface and API. It lists 42 languages, voice cloning, and a maximum input of 6000. Audio can be exported as mp3, ogg_vorbis, ogg_opus, pcm, mu-law, or a-law. Voice options are organized into Standard, Neural, Long-Form, and Generative plans, with charges billed monthly for processed characters. Standard costs $4 a month for Standard voices and Speech or Speech Marks requests. Neural costs $16 a month for Neural voices and those request types. Long-Form costs $100 a month for Long-Form voices and those request types. Generative costs $30 a month for Generative voices and Speech requests. The free tier lists 5 million Standard characters, 1 million Neural characters, 500,000 Long-Form characters, and 100,000 Generative characters for 12 months. Amazon Polly is listed as founded in 2006 and headquartered in Seattle, Washington, United States.

iSpeech provides text-to-speech and automated speech recognition through APIs, SDKs, and online tools. Its speech API can synthesize audio with multiple voices, formats, bitrates, frequencies, and playback speeds, and supports MathML and SSML. The API can also transcribe submitted audio across multiple languages and recognition models; iSpeech says custom models can be created. The homepage lists support for more than 30 languages. Audio downloads are available in AIFF, MP3, OGG, WMA, FLAC, WAV, A-law, μ-law, VOX, and MP4 formats. Listed access includes Android, iOS, Linux, macOS, web, Windows, API, and extension. The Basic plan is free for personal use, and commercial use is listed as available. Plus costs $2.95 a month, billed monthly, and includes 30-minute recordings, approximately 4,167 words. Premium costs $3.95 a month, billed monthly, with 12-hour recordings, approximately 100,000 words. Pay Per Use costs $50 a month for dynamic TTS usage only and includes 2,000 credits. Pay Per Install costs $0.25 a month and has a 10,000-install minimum.