StepAudio 3

StepAudio 3

StepFun
+
+

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About

Music that fits your story perfectly. Sonilo uses proprietary AI to generate custom music that understands your video, matches its length, and delivers in seconds.

About

StepAudio 3 is StepFun’s next-generation audio model family, built to understand, generate, and interact through voice, sound, and music. The lineup includes StepAudio 3 Realtime for natural full-duplex conversation, StepAudio 3 ASR for speech recognition, StepAudio 3 TTS for speech synthesis, StepAudio 3 Gen for general-purpose audio generation, and StepAudio 3 Music for long-form music creation. Realtime is designed around a continuous listen-converse-think-act loop, understanding not only words but also hesitation, laughter, emotion, pauses, backchannels, and interruptions. It can think while speaking, reason through harder questions without breaking conversational flow, and use tools to complete tasks once it understands the user’s intent. StepAudio 3 Gen unifies zero-shot TTS, voice design, vocal generation, sound effects, music, and mixed audio generation within one framework, while StepAudio 3 Music supports text-controlled songs, instrumentals, vocal arrangement, and more.

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Platforms Supported

Windows Not Supported
Mac Not Supported
Linux Not Supported
Cloud Supported
On-Premises Not Supported
iPhone Not Supported
iPad Not Supported
Android Not Supported
Chromebook Not Supported

Audience

Video Creators, Small Businesses and Marketing Teams, Film and Game Production Teams

Audience

Developers, AI teams, and creators needing to build real-time voice agents, speech applications, transcription systems, and generative audio or music experiences

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

Support

Phone Support Not Supported
24/7 Live Support Not Supported
Online Supported

API

Offers API Not Supported

API

Offers API Not Supported

Screenshots and Videos

No images available

Screenshots and Videos

Pricing

$10/month
Free Version Supported
Free Trial Not Supported

Pricing

No information available.
Free Version Not Supported
Free Trial Not Supported

Reviews/Ratings

Overall 5.0 / 5
ease 5.0 / 5
features 5.0 / 5
design 4.9 / 5
support 4.9 / 5

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

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Pros & Cons from Real Users

Pros

  • Sonilo's API and MCP integration options are appealing for applications that already work with video. Having music generation and sound-effects capabilities available through an existing service could save developers from having to build all the audio-generation functionality themselves. It offers an interesting way to extend a creative application with additional audio features.
  • I like that Sonilo's API can generate music based on video footage and create sound effects that follow the action. The ability to request music and effects together is useful for applications that need to add audio to video content. It also offers an opportunity to reduce some of the manual work involved in preparing audio for repeated production tasks.
  • The video translation and dubbing features are particularly interesting for educational content. Being able to create versions of existing videos in other languages could help course creators reach more learners without having to rebuild every lesson from scratch. Reusing existing video material can make the process of preparing localized content more manageable.
  • Sonilo is an interesting option for adding music and sound effects to product demonstrations and promotional videos. I like the idea of starting with the finished video and generating audio to match it. This can save time compared with searching through music libraries and manually adjusting tracks to fit the footage.
  • I like that Sonilo generates music around the video's content and length. It saves time that would otherwise go into searching audio libraries and adjusting tracks to fit an edit. Having music and sound effects available in the same workflow is also useful, especially when preparing videos for advertising campaigns.

Cons

  • I'd appreciate clearer documentation explaining which features are available through each integration and how the setup differs. More end-to-end examples showing how to request audio, review the result, and incorporate it into an application would also make implementation easier.
  • The different response patterns for music and sound-effects requests require some extra handling during integration. Music responses stream back, while sound-effects requests require checking a task until it's complete. A more consistent approach would make the development process simpler.
  • I'd like to see support for longer videos when using translation and dubbing features. Educational lessons often include detailed explanations and examples, so a higher video length limit would make the workflow more convenient for courses that require longer recordings.
  • I'd like more than two options to choose from when generating music and sound effects for a video. Having additional variations would make it easier to find something that matches the product and brand without needing as many adjustments.
  • Sometimes I want more control over the final audio, particularly when a campaign needs a specific sound. Text prompts for generating music and sound effects are helpful, but I'd still appreciate more ways to fine-tune the results.

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Training

Documentation Supported
Webinars Not Supported
Live Online Not Supported
In Person Not Supported

Company Information

Sonilo
Founded: 2025
United States
sonilo.com

Company Information

StepFun
United States
static.stepfun.com/blog/stepaudio3/

Alternatives

Alternatives

Lyria 3.5

Lyria 3.5

Google
Stable Audio

Stable Audio

Stability AI
Seed-Music

Seed-Music

ByteDance
Mirelo AI

Mirelo AI

Mirelo

Categories

Categories

AI Models Supported

Integrations

No info available.

Integrations

No info available.
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