Comparison
Silenis vs HeyGen: An Honest Comparison (2026)
Silenis and HeyGen both localize video with AI, but they target different jobs. Silenis is a focused dubbing tool. HeyGen is a full AI avatar video platform that also does translation. Here is how they compare on the dimensions that matter for dubbing.
Quick Comparison
| Dimension | Silenis | HeyGen |
|---|---|---|
| Primary product | Video dubbing tool | AI avatar video platform with translation feature |
| Pricing model | Pay-per-use, no subscription | Monthly subscription with shared credit pool |
| Per-minute dubbing cost | ~$1.20/min ($0.12 per 6 seconds) | Varies by credit consumption across all features |
| Languages | 36+ dubbing languages | 175+ languages and dialects |
| AI avatars (text-to-video) | No | Yes — flagship feature |
| Voice cloning | No (curated voice catalog) | Yes (Pro plan and up) |
| Background music preservation | Yes (Demucs-based) | Not the focus of the translation workflow |
| Lip-sync | No | Yes (in translation feature) |
| Free preview | Yes (watermarked) | Free tier: up to 3 videos per month |
| API | Not currently exposed | Yes |
Feature-by-Feature
What each tool is built for
Silenis is built for one job: take an existing video and produce a dubbed version in another language. The product is the dubbing pipeline.
HeyGen is built as an AI avatar video platform. Its flagship feature is generating videos of synthetic presenters from a text script — you type, and a digital person speaks. Video translation and dubbing is one feature among many, sitting alongside Avatar IV, Video Agent, image generation, and more. This is an important framing: choosing HeyGen for dubbing alone means paying for a platform you mostly won't use.
Pricing model
Silenis is pure pay-per-use: $0.12 per 6 seconds of source video (~$1.20 per minute). No subscription, no monthly minimum. Free watermarked preview before you pay.
HeyGen uses a subscription model with a shared credit pool. The Free plan gives you up to 3 videos per month with limited trial features. Creator is $29/month on annual billing (promotional $24/month first year) with monthly credit allocations; Pro is $49/month and adds voice cloning, advanced AI models, and credit rollovers; Business is $149/month plus $20/seat and adds multi-workspace control and enterprise security. Credits are shared across every HeyGen feature — you do not get a dedicated dubbing budget. Credit rollover rules differ by plan and credits expire if you cancel.
Music and sound effects
Silenis is built around music preservation. It uses Demucs-based vocal separation to isolate the spoken voice, translate and re-synthesize it, then remix with the original background music, sound effects, and ambient audio. The output video keeps its original soundtrack.
HeyGen's video translation feature produces a dubbed audio track with lip-sync. Original background music preservation is not its primary design goal; if your source video relies on a music bed, test HeyGen's output carefully before committing.
Languages
HeyGen advertises 175+ languages and dialects for its video translation feature — a very broad set. Silenis currently supports 36+ dubbing languages. HeyGen wins on raw count; Silenis prioritizes shipping high-quality TTS voices in the languages it does support.
AI avatars
HeyGen's flagship strength. You can generate videos of synthetic presenters from text, choose from stock avatars, create custom avatars, and use Avatar IV (premium) for higher fidelity. If your use case is “produce a presenter-led video from a script,” HeyGen is the right tool.
Silenis does not generate avatars or synthetic presenters. It works with the video you upload.
Voice cloning
HeyGen supports voice cloning on Pro and above. You upload a voice sample and can generate speech in that voice. Silenis uses a curated voice catalog and does not require cloning — pick a voice, get the dub.
Pricing Comparison
Cost for a 10-minute video dubbed into one target language:
- Silenis: 600 seconds × ($0.12 / 6) = $12.00. Pay once, no subscription.
- HeyGen Creator (annual): $24–$29/month subscription. Credit consumption per minute of translation varies; you would need to verify the current per-minute credit cost in HeyGen's UI. If translation consumes a large share of monthly credits, you may outgrow the plan quickly.
- HeyGen Pro: $49/month. Adds voice cloning and advanced models. Reasonable if you also generate avatars and other content.
For pure dubbing, Silenis is consistently cheaper because you only pay for the dubbing job — there is no unused avatar or video generation capacity. For users who also generate avatar-led content, HeyGen can be the better overall value.
When to Choose Silenis
- You have an existing video and need it dubbed into other languages.
- You want pay-per-use pricing without a monthly subscription.
- Your video has background music or sound effects that must survive the dub.
- You don't need synthetic avatars or presenter-led video generation.
- You want to preview the dub for free before paying.
When to Choose HeyGen
- You need AI avatars or presenter-led video generation as a primary workflow.
- You need 175+ language coverage, including less common dialects.
- You want a single platform for both avatar creation and video translation.
- You need team workspaces, multi-user access, or enterprise SSO/SCIM.
- You need lip-sync for talking-head content.
- You have a recurring monthly volume that justifies a subscription.
FAQ
Is Silenis cheaper than HeyGen?
For pure dubbing, generally yes. Silenis is $1.20 per minute of source video with no subscription. HeyGen's Creator plan is $29/month annually ($24/month first-year promo) and Pro is $49/month, with credits shared across all HeyGen features. If you only need dubbing and use a small share of credits each month, Silenis's pure pay-per-use model is more economical.
Does Silenis have AI avatars like HeyGen?
No. Silenis is a dubbing tool — it translates and replaces the audio track on existing videos. HeyGen is an AI avatar video platform: it can generate videos of synthetic presenters from text, plus localize them. If you need to create a video with a synthetic presenter, use HeyGen. If you already have a real video and need it in another language, Silenis is the better fit.
Which tool preserves background music?
Silenis preserves original background music, sound effects, and ambient audio in the dubbed output by separating vocals with Demucs and remixing them with the original music bed. HeyGen's translation feature produces a new audio track; original music preservation depends on the workflow but is not its primary design goal.
How many languages do Silenis and HeyGen support?
HeyGen advertises 175+ languages and dialects for its video translation feature. Silenis currently supports 36+ dubbing languages with high-quality TTS voices. HeyGen has broader language coverage; Silenis prioritizes voice quality over raw language count.
Do I need to clone my voice with either tool?
No with Silenis — it uses a curated voice catalog. HeyGen supports both voice cloning and stock AI voices; cloning is optional but available if you want a specific voice identity.
Which is better for YouTube creators expanding to new markets?
Both work for YouTube. Silenis is cheaper for occasional dubbing and preserves the original soundtrack. HeyGen is better if you also want to generate avatar-based videos in addition to dubbing existing footage. For YouTube specifically, Silenis's music preservation matters: most YouTube videos have music beds that you do not want stripped away.
Can I try both tools on the same video before paying?
Yes. Silenis offers a free watermarked preview on any upload before purchase. HeyGen's Free plan includes up to 3 videos per month with limited trial access to premium features. Upload the same source to both and compare the output.
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