Sencial API
Sencial API is a REST API for developers building audio-processing features into applications.
What Sencial API is
Sencial API is a REST API for developers building audio-processing features into applications. Its endpoints separate audio into 2, 4, or 6 stems, detect acoustic scenes, isolate selected sounds, enhance voices, and separate and label multiple speakers. Voice embeddings return 512-D vectors for matching and clustering. For streaming, a WebSocket endpoint supports low-latency processing; asynchronous jobs can be checked by polling or webhook notifications. Developers can use the API documentation, quick-start guide, and Python, JavaScript, and cURL examples. The free tier includes 10 minutes of processing per month, all API endpoints, and 128 kbps MP3 output, with no credit card required. The Developer plan is $49 a month and includes 300 minutes, WebSocket processing, WAV/FLAC output, and $0.20/min overages. Enterprise pricing is custom. The API is intended for projects such as hearing apps, music tools, meeting assistants, and scene-understanding applications. Beta access requires approval; the stated response time is 2–3 business days. Requests use a bearer API key in the Authorization header.
Good
- Free tier includes all API endpoints.
- Supports separation into 2, 4, or 6 stems.
- Offers WebSocket streaming and asynchronous jobs.
- Provides Python, JavaScript, and cURL examples.
Watch out
- Free plan is limited to 10 minutes monthly.
- Developer beta access requires approval.
- Developer plan overages cost $0.20/min.
Who it suits
Sencial API suits developers building audio features such as sound separation, scene detection, or speaker analysis. Its free tier can suit projects needing up to 10 minutes of processing monthly.
Verdict
Sencial API brings several audio-processing functions together behind REST endpoints, with streaming and asynchronous job options. The free tier has a stated monthly processing limit, while the Developer plan starts at $49 a month.
Plans and prices
From Sencial API's own pricing page, checked 7 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Starter | Free | 10 minutes of audio processing/month · All API endpoints · 128 kbps MP3 output · Email support |
| Developer | $49 a month | 300 minutes/month included · WebSocket real-time processing · WAV/FLAC lossless output · Priority support & SLA · $0.20/min overages · $49/mo |
| Enterprise | Priced on request | Volume discounts available · On-premise deployment options · Custom model training · Dedicated support team · White-label solutions · Custom |
The facts
Each one read from Sencial API's own pages, with the date it was checked.
What it does
- Async jobs
- The Jobs API lets clients poll asynchronous tasks or receive webhook notifications.checked 7 Oct 2026
- Beta access
- Developer beta access is subject to approval, with a stated response time of 2–3 business days.checked 7 Oct 2026
- Developer resources
- The page offers API documentation, a quick-start guide, and Python, JavaScript, and cURL code examples.checked 7 Oct 2026
- Purpose
- Sencial API provides REST endpoints for sound separation, scene detection, sound and voice isolation, multi-speaker diarization, and voice embeddings.checked 7 Oct 2026
- Scene detection
- The /v1/scene-detect endpoint classifies acoustic environments in real time.checked 7 Oct 2026
- Security
- API requests use a bearer API key in the Authorization header, as shown in the page's cURL example.checked 7 Oct 2026
- Sound isolation
- The /v1/isolate endpoint focuses or suppresses specific sound sources.checked 7 Oct 2026
- Speaker tools
- The /v1/diarize endpoint separates and labels multiple speakers, while /v1/voice-embed returns 512-D vectors for voice matching and clustering.checked 7 Oct 2026
- Stem separation
- The /v1/separate endpoint splits audio into 2, 4, or 6 stems with lossless export.checked 7 Oct 2026
- Streaming
- The /v1/rt endpoint offers WebSocket endpoints for low-latency streaming.checked 7 Oct 2026
- Use cases
- The page describes hearing apps, music tools, meeting assistants, and scene-understanding applications as things developers can build.checked 7 Oct 2026
- Voice processing
- The /v1/voice-isolate endpoint enhances voices and reduces background noise.checked 7 Oct 2026
Money
- Free tier terms
- The free tier includes 10 minutes of processing per month and requires no credit card.checked 7 Oct 2026
Alternatives to Sencial API
- 1
LALAL.AI
Free planAndroidiOSWebAPI8.3From €6.75 a month - 2
AudioShake
Free planAndroidiOSWebAPI8.1From $20 a month - 3
Denoise
Free planAndroidiOS7.8From $2.99 a month - 4
ElevenLabs
Free planWebAPI7.6From $6 a month - 5
BytePlus Voice and Background Audio Separation
WebAPILinuxmacOS6.8$0.01 usage-based - 6
AIVoiceSeparator
Free planWebAPI6.7From $30 a month