iSpeech vs Telnyx Text-to-Speech API

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.

Telnyx Text-to-Speech API turns text into speech for applications and commercial use. It supports voice cloning and offers MP3 and WAV exports. The API uses REST, is available through API and web platforms, and runs in the cloud. SDKs are listed for Python, Ruby, Node.js, PHP, and.NET. Pricing includes a free plan with a $0 monthly minimum, standard usage rates, automatic tier discounts as usage rises, and no contract. The Committed plan is $500 a month, with discounted usage rates, a named account manager, priority support, and higher limits. Enterprise is $5,000 a month and includes dedicated infrastructure and IPs, private interconnect, in-region GPUs, and unlimited rate limits. The pricing note also says from $0.05, while usage rates are variable rather than a single flat fee. The maker is headquartered in Austin, Texas, and was founded in 2009.