iSpeech vs Sonex Labs
iSpeech
ispeech.org
Sonex Labs
sonexlabs.comSide by side
| Figure | iSpeech | Sonex Labs |
|---|---|---|
| Price from | $0.25/mo | $5/mo |
| Free plan | Yes | Yes |
| Free trial | Yes | — |
| Open source | Yes | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| iOS | Yes | — |
| Android | Yes | — |
| API | Yes | Yes |
| Self-hosted | — | Yes |
| Plans published | 15 | 3 |
| Spec score · Text-to-Speech Software | 9.2 (#6) | 8.4 (#72) |
| Spec score · Text-to-speech tools | 9.2 (#11) | 8.8 (#25) |
| API access | API access requires an API key, with mobile development, mobile production, and web/general production key types. | Yes |
| Company | iSpeech describes itself as a privately held company headquartered in Newark, New Jersey, with an office in San Francisco, California. | The site footer identifies the company as Sonex Labs and shows copyright © 2026; the pages reviewed did not state its headquarters or founding year. |
| Export formats | aiff,mp3,ogg,wma,flac,wav,alaw,ulaw,vox,mp4 | WAV,MP3,OGG,Opus,μ-law |
| Free plan | Yes | Yes |
| Platforms | web,ios,android,api | web,api |
| Product | iSpeech provides text-to-speech and automated speech recognition services through APIs, SDKs, and online tools. | Sonex Labs offers voice AI products for speech synthesis, speech recognition, voice agents and calling workflows. |
| Security | The privacy policy says iSpeech uses commercially reasonable physical, managerial, and technical safeguards, while stating it cannot warrant the security of transmitted information. | The maker states that data is encrypted in transit and at rest, with tenant-isolated workspaces and audit trails. |
| Paid from | 2.95 | 5 |
| Support | The developer pricing page lists priority technical support with purchases; the API guide directs support requests to [email protected]. | Self-serve plans list email support; enterprise includes a dedicated account manager, priority SLA and Slack. |
| Usage limits | Developer pay-per-use pricing describes dynamic TTS usage only and asks customers to contact iSpeech about static use, caching, or downloading audio. | The testing tier is limited to 5 requests per second burst and 120 requests per minute sustained. |
| Voice synthesis | The API supports spoken audio in multiple voices, formats, bitrates, frequencies, and playback speeds, as well as MathML and SSML. | Pāṇini provides 120 platform voices, streaming audio, emotion controls, non-verbal tags and pronunciation dictionaries. |
Plans
iSpeech
- Plus$2.95 a month
- Premium$3.95 a month
- Pay Per Use$50 a month
- Pay Per Install$0.25 a month
- BasicFree
- HackerFree
- Plus$2.95 a month
- Premium$3.95 a month
- Junior$29 a month
- Pay-per-use 2,000 credits$50, paid once
In their own words
iSpeech
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.
Sonex Labs
Sonex Labs has no write-up on Specifiction yet; its figures are above.