Image and video
Synthesia alternatives
2 open-source projects that already do this job. Free to use - not free to run, which is what the numbers on the right are for.
The projects
calesthio/OpenMontage★45,713 GitHub starsAGPL-3.0 licenceAgentic video production studio offering pipelines and tools to generate, edit, and compose complete videos.Open on GitHub ↗buxuku/SmartSub★4,486 GitHub starsMIT licenceDesktop app for subtitle generation, translation, AI dubbing, and local voice cloning for videos.Open on GitHub ↗
What you give up either way
- High-quality proprietary avatar models and expressive gestures (Veo/Express avatars)
- Enterprise-grade compliance attestation and audits (SOC2/ISO/GDPR assurances)
- Scale, reliability, and global localization quality at commercial scale
- Integrated analytics, SSO/SAML, dedicated support and customer success
- Polished real-time collaboration, branded share pages, and built-in templates
An open-source project doing the core job proves a replacement is possible. It does not prove it matches Synthesia, and it does not prove anyone has run it for a month. How we decide.