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Synthesia vs Captions (AI Ads)
Pick Synthesia for enterprise-grade avatars for training and internal comms; pick Captions (AI Ads) for best-in-class captions and in-app short-form editing.
By Mark Gradler · Scores verified 2026-10
Choose Synthesia if…
Your job is L&D, onboarding, or knowledge video at scale, not performance ads.
Choose Captions (AI Ads) if…
You edit your own short-form and want the strongest captioning and editing.
Side by side
| Synthesia | Captions (AI Ads) | |
|---|---|---|
| Editorial score | 7.1/10 | 7.0/10 |
| Category | Enterprise avatar video (adjacent) | Caption-first short-form + UGC |
| Best for | Enterprise L&D, internal comms, and knowledge video | Creators editing their own short-form content |
| Pricing from | free tier; paid around $29/mo (Starter) | free tier; paid from $9.99/mo (Pro) |
| Free trial | Yes (free tier) | Yes (free tier) |
| Actors / avatars | 125-240+ avatars depending on plan, custom avatars | Smaller AI-actor set |
| Languages | 140+ languages | Multiple |
| Custom avatars | Yes | Yes |
| Output realism | 8/10 | 7/10 |
| Workflow & speed | 7/10 | 8/10 |
| Actors & languages | 8/10 | 6/10 |
| Value for money | 6/10 | 7/10 |
| Fit & support | 6/10 | 7/10 |
Where they differ
- Actors & languages: Synthesia leads Captions (AI Ads), 8/10 to 6/10. Breadth of AI actors/avatars, custom-avatar support, and language/accent coverage. Matters most for localisation and for finding a face that fits your brand.
- Output realism: Synthesia leads Captions (AI Ads), 8/10 to 7/10. How believable the AI actor / avatar / voice looks and sounds. Lip-sync, hands, and audio naturalness. The thing that decides whether an ad reads as human.
- Workflow & speed: Captions (AI Ads) leads Synthesia, 8/10 to 7/10. How fast you get from idea to a usable ad, and how much manual editing is left over. Batch generation, script tools, hooks, captions, variations.
- Value for money: Captions (AI Ads) leads Synthesia, 7/10 to 6/10. Real cost per usable video once credits, add-ons, and re-rolls are counted, against comparable tools. Not sticker price - effective price.
- Fit & support: Captions (AI Ads) leads Synthesia, 7/10 to 6/10. How well the tool fits a specific job (app ads, e-commerce, B2B, localisation), plus onboarding, docs, and support quality.
Synthesia in one line
The enterprise standard for avatar video in training and internal comms - included for context, but the wrong tool for scrappy performance-ad UGC.
Captions (AI Ads) in one line
The pick if you edit your own short-form and want the strongest captions and in-app editing - less suited to fully hands-off AI-actor ad generation.
Common questions
How much do Synthesia and Captions (AI Ads) cost?
Synthesia: free tier; paid around $29/mo (Starter). Captions (AI Ads): free tier; paid from $9.99/mo (Pro). Pricing shifts often, so confirm on each vendor's site.
Do Synthesia or Captions (AI Ads) have a free trial?
Synthesia: Yes (free tier). Captions (AI Ads): Yes (free tier).
Can you make a custom avatar with Synthesia or Captions (AI Ads)?
Synthesia: yes. Captions (AI Ads): yes.