Altered Studio vs SESTEK Text-to-Speech
Altered Studio
altered.aiSESTEK Text-to-Speech
sestek.comSide by side
| Figure | Altered Studio | SESTEK Text-to-Speech |
|---|---|---|
| Price from | $30/mo | — |
| Free plan | Yes | — |
| Free trial | Yes | — |
| Open source | — | — |
| Web | Yes | — |
| Windows | Yes | Yes |
| macOS | Yes | — |
| Linux | — | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 6 | 3 |
| Spec score · Text-to-Speech Software | 9.5 (#1) | 7.9 (#124) |
| Spec score · Text-to-speech tools | 9.3 (#6) | 8.1 (#90) |
| API access | The FAQ says API access is offered to Enterprise customers for integrating Studio into other systems. | Yes |
| Headquarters | The privacy policy gives Altered Ltd's address as Ground Floor, 298 West End Lane, London NW6 1LN, UK. | Istanbul, Türkiye |
| Integration | Google Drive integration supports importing, sharing and exporting audio files. | SESTEK says APIs and SDKs can add voice capabilities to existing software, and its platform supports Azure and ElevenLabs integrations. |
| Integrations | The online Voice Editor can work with audio files in Google Drive, and RealTime Pro routes audio through a virtual microphone to apps including Discord, Zoom, Microsoft Teams, and Google Meet. | The platform supports Azure and ElevenLabs integrations and can connect with SESTEK Speech Recognition, Virtual Translator, and AI Agents. |
| Security | The privacy policy says Google Drive access is optional and that Google user data is used only to provide or improve user-facing application features. | SESTEK states that it holds ISO 27001, ISO 9001, and SOC 2 Type 2 certifications and undergoes annual independent audits. |
| Voice cloning | Users can make a Rapid Voice Clone with 4–8 seconds of audio; custom voice models are available by contacting Altered. | Yes |
| Voice controls | Morphing provides controls for prosody, pitch, age, gender, loudness and vocal creak. | Users can tune tone, pace, emphasis, and volume, and define custom pronunciations for abbreviations and specialized terms. |
| What it does | Altered Studio combines speech-to-speech voice morphing, text-to-speech, cloning, transcription, translation, dubbing and audio editing in one platform. | SESTEK Text-to-Speech converts written content into clear, expressive, human-like speech. |
Plans
Altered Studio
- FreeFree
- Creator$30 a month
- Professional$90 a month
- Creator$360 a year
- Professional$1,080 a year
- EnterprisePriced on request
SESTEK Text-to-Speech
- Custom agreementPriced on request
- Pay-as-you-goPriced on request
- SubscriptionPriced on request
In their own words
Altered Studio
Altered Studio combines voice transformation and audio production tools for creating professional voice content. Its Speech-to-Speech and Performance-to-Performance morphing changes a voice while retaining the speaker’s performance. Other tools include text-to-speech, voice cloning, AI voice cleaning, denoising, audio editing, DSP effects and batch processing. Studio supports transcription and translation in 75+ languages, and text-to-speech voice-over in 70+ languages. A Rapid Voice Clone can be made from 4–8 seconds of audio; custom voice models are available by contacting Altered. The online Voice Editor can work with Google Drive audio, while RealTime Pro routes audio through a virtual microphone to apps including Discord, Zoom, Microsoft Teams and Google Meet. The free plan includes 3 minutes per month of voice morphing and 10,000 AI tokens. Creator costs $30 a month billed annually; Professional costs $90 a month billed annually. Desktop use requires a Windows PC with an 8GB+ Nvidia GPU, and mobile devices are not currently supported.
SESTEK Text-to-Speech
SESTEK Text-to-Speech converts written text into speech for business applications. It supports more than 20 languages and offers accent-specific voices such as Gulf, Najdi, Kuwaiti, and Emirati Arabic, along with American and British English. Users can adjust tone, pace, emphasis, and volume, and define pronunciations for abbreviations, brand names, product codes, and specialized terms. Common SSML tags cover pauses, pronunciation, external audio, and voice switching. SESTEK can develop a voice model for an organization that is exclusive to it. Deployment is available on-premises or in the cloud, with the same feature set in either arrangement. Standard voices run on Windows, Linux, Docker Compose, and Kubernetes without a GPU; Premium voices require a GPU and run on Linux, Docker Compose, and Kubernetes. APIs and SDKs support integration with existing software. The platform also supports Azure and ElevenLabs integrations and can connect to SESTEK Speech Recognition, Virtual Translator, and AI Agents. Exports include WAV, Opus, MP3, and FLV. Licensing is available through pay-as-you-go, subscription, or custom agreement, but pricing is on request.