Captions vs Synthesia
Both AI avatar video platforms, Captions (Mobile-first AI UGC/short-form video creator with AI 'digital twin' avatars as the core feature (not a general timeline editor); pricing page explicitly notes plans are iOS-only) and Synthesia (Enterprise AI avatar video for corporate training, communications, and localization) go head to head here, priced from $24.99/mo and $29/mo respectively. Start with the bottom line, then the verified fact table and real production costs.
Synthesia wins three of four use cases, and the facts behind each verdict are concrete. For conversational avatars, Synthesia offers interactive avatar functionality while Captions does not surface an equivalent feature. For developers and API integrations, Synthesia bundles API access within the Creator plan and above at no separate metered rate, whereas Captions charges $0.15 per second for video generation through its API, adding up quickly at scale. For training and L&D teams, Synthesia supports SCORM and LMS export, batch CSV personalization, video translation across 160+ languages, and up to 150 scenes per video, making it purpose-built for enterprise learning workflows. Captions edges out on price at $24.99/mo versus Synthesia's $29/mo entry monthly rate, but Synthesia's $18/mo annual plan narrows that gap. The breadth of enterprise-ready capabilities gives Synthesia a clear overall lead.
Reviewed by vsref Editorialfacts verified Aug 24, 2026Methodology →
Synthesia is our pick for most teams. Start there, or weigh the use-case verdicts below.
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Captions vs Synthesia: head-to-head facts
Every row independently verified| Fact | Captions | Synthesia |
|---|---|---|
| Pricing unit | creditsAug 24 | credits (with a parallel published minutes/year cap per p...Aug 24 |
| Cheapest paid plan (monthly) | $24.99Aug 24 | $29Aug 24 |
| Credits/minutes included at entry plan | 500 credits/moAug 24 | 14,500 credits/yearAug 24 |
| What the free plan caps | Basic editing only (trimAug 24 | 1,200 credits/moAug 24 |
| Custom avatar from footage | ✓ YesAug 24 | ✓ YesAug 24 |
| Instant avatar from a photo | ✓ YesAug 24 | ✓ YesAug 24 |
| Lip-sync languages supported | n/a | 160+Aug 24 |
| Public API | ✓ YesAug 24 | ✓ YesAug 24 |
| Interactive / conversational avatars | n/a | ✓ YesAug 24 |
| Batch / CSV personalization | n/a | ✓ YesAug 24 |
| Commercial usage rights | "you may use such Output outside the ServicesAug 24 | "Customer will own all Customer Data"Aug 24 |
Captions vs Synthesia pricing: true cost at 3 usage tiers
Effective $/finished video minute at 3 monthly volumes, credits decoded to real minutes from each vendor's own published conversion. A tool that does not publish that conversion renders honestly as n/a rather than a guess; open-source tools are self-hosted, never $0.Captions vs Synthesia: verdicts by use case
For budget-conscious solo creators, the cheapest paid monthly price is the deciding factor. Captions comes in at $24.99/mo versus Synthesia at $29/mo, a meaningful difference at this scale. On the free tier, Synthesia watermarks all output, which is a real barrier for anyone wanting usable content without paying. Captions' free tier restricts features, but the watermark situation is not documented as blocking in the same way. Both tools include credits at entry level, though the structures differ. The lower monthly price plus a less restrictive free tier gives Captions the edge for pure budget use.
For teams building a live, talking avatar that answers back in real time, the single most critical capability is whether the platform explicitly supports interactive and conversational avatars. Synthesia has a confirmed feature for this, while no equivalent exists for Captions. That gap alone is decisive for this use case. Both tools offer a public API and voice cloning, so those attributes are level. Where Synthesia pulls further ahead is its native ElevenLabs partnership for bring-your-own TTS, giving developers a direct route to integrate high-quality voice AI into a conversational stack without extra plumbing. Captions charges $0.15/sec for API-based avatar video generation, while Synthesia includes API access on Creator plan and above without separate metering, which meaningfully lowers the cost of high-frequency, real-time interactions.
Both tools offer a public API, but pricing structure is the deciding factor for developers. Captions charges $0.15/sec for video generation via its API, making costs easy to model per call. Synthesia includes API access on paid plans without separate metering, which can be cost-effective but less transparent for usage-based billing. Synthesia also offers a native ElevenLabs integration for bring-your-own TTS, a clear developer advantage Captions lacks. Critically, Synthesia supports interactive conversational avatars, which Captions does not document. Both grant commercial output rights. The combination of unmetered API access, TTS integration, and interactive avatars tips the balance toward Synthesia.
For corporate L&D teams, the single most critical requirement is getting video output into an LMS, and only Synthesia publishes verified SCORM/LMS export support. Captions has no confirmed capability here, making Synthesia the only safe choice for teams whose content must land in a learning management system. On translation, Synthesia again leads with verified video translation and dubbing across 160+ languages, while Captions offers no confirmed dubbing feature. Synthesia also ships 60+ video templates to speed up course production, and its annual entry price of $18/mo compares favorably to Captions' $24.99/mo monthly entry rate. Both tools provide adequate commercial usage rights. The combination of SCORM export and built-in translation is decisive for any audit-conscious L&D workflow.
Captions vs Synthesia: common questions
Is Synthesia cheaper than Captions?+−
It depends on how you pay. Captions starts at $24.99/mo on monthly billing, while Synthesia starts at $29/mo on monthly billing but drops to $18/mo on an annual plan. So Synthesia is more expensive month-to-month but cheaper if you commit annually. The tools also measure usage differently: Captions gives 500 credits/mo at the entry level, while Synthesia provides 14,500 credits/year, making a direct cost-per-output comparison tricky without knowing your volume.
Synthesia vs Captions: which is better for budget?+−
Captions starts at $24.99 per month while Synthesia starts at $29 per month, giving Captions the lower entry price on a monthly plan. Synthesia drops to $18 per month on an annual plan, making it competitive if you commit upfront. For API usage, Synthesia includes it on paid plans, while Captions charges $0.15 per second of video generated, which can add up quickly for high-volume use.
Does Synthesia or Captions cost less for API video generation?+−
For API use, Captions charges $0.15 per second of video generated through its Mirage Avatar X model. Synthesia includes API access at no separate metered charge on the Creator plan and above, making Synthesia potentially more cost-effective for teams that plan heavy API usage and are already on a qualifying plan.
Is Synthesia or Captions better for multilingual corporate training videos?+−
Synthesia supports lip-sync in 160+ languages, offers SCORM and LMS export, video translation and dubbing, and batch CSV personalization. It also provides 60+ video templates. These features make it especially well suited to multilingual corporate training at scale.
Is Synthesia or Captions a better alternative for teams that need a large stock avatar library?+−
Both tools offer sizable avatar libraries. Captions provides 200 to 225 avatars. Synthesia's library scales by plan: 125+ on Starter, 180+ on Creator, and 240+ on Enterprise. Teams needing the largest selection would find more options with Synthesia at the Enterprise tier.
Does Synthesia charge extra to create a custom avatar from your own footage?+−
Yes. Synthesia charges $1,000 per year for custom avatar creation. Both platforms support building a custom avatar from footage, but Synthesia's fee applies on top of the base subscription.
Do both Synthesia and Captions include voice cloning?+−
Both tools include voice cloning. Synthesia also has a native ElevenLabs integration that brings additional voice options directly into the product.
Who owns the videos I create: me or the platform?+−
Both tools grant you rights to your output. Captions states that, as between the parties, you retain ownership of your output. Synthesia states the customer will own all Customer Data. Review each vendor's full terms for any conditions or exceptions before relying on these summaries.
Does Synthesia support interactive or conversational avatars?+−
Synthesia offers interactive and conversational avatar functionality, allowing viewers to engage with an avatar in a back-and-forth format. This can be useful for onboarding flows, virtual assistants, and similar applications.
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