Synthesia vs HeyGen: AI video avatar tools compared

Synthesia and HeyGen both turn a script into a video with a realistic AI presenter, so you don't need a camera or a studio. Synthesia leans toward structured, team-oriented training and corporate video. HeyGen leans toward marketing and social content, with a large avatar catalogue and a wide language list. Both have a free plan, so you can try them before paying.

Updated: October 2026

What both tools do

An AI avatar video tool takes text, which it reads aloud with a synthetic voice, and shows a digital presenter speaking it, with lip movements synced to the audio. You write or paste a script, pick a presenter and a layout, and the platform renders the video. If the script changes, you edit the text and render again instead of reshooting.

Both companies have grown well beyond that first idea. Synthesia's avatar page lists ready-made avatars, personal avatars made from a photo, an avatar builder that works from a prompt, and interactive avatars that listen and answer in real time. HeyGen's avatar page presents a generator aimed at sales outreach, product explainers, marketing, course lessons and social content.

The overlap is big, so the useful question is not which one is better in general. It is which one fits your kind of video, your team size, and how much you care about consent and control over your own likeness.

Avatar realism and variety

Realism is subjective, and both companies claim the top spot. Synthesia calls its product the most realistic AI avatar generator and says its avatars gesture and speak naturally. HeyGen says its avatars read as real people on camera and cites a G2 ranking as the most realistic. Both are marketing claims, so judge with your own eyes on a short test script.

Variety differs. Synthesia says it has 240+ ready-made avatars, with full-body gestures and expressions. You can also change outfits and backgrounds, including with your own brand assets. On its pricing page, the number of stock avatars depends on the plan: 125+ on Starter, 180+ on Pro and 240+ on Enterprise.

HeyGen's avatar page mentions 1,100+ avatars, while its pricing page lists 500+ stock video avatars on the Free plan and 700+ on Creator and Pro. The two HeyGen pages don't match, so treat the numbers as a rough order of magnitude and look at the catalogue after you sign up. The pricing page also names several avatar engines: Avatar III and IV on Creator, with limited use of Avatar V, and Avatar V on Pro with first access to newer models.

A third-party comparison from the competitor Colossyan says reviewers describe HeyGen's avatars as more expressive in short-form content, and Synthesia's as more consistent across longer material. Colossyan sells a rival product, so take that as one opinion, not a measurement.

Custom avatars and consent rules

Both tools let you build a digital twin of yourself, and both tie it to the permission of the person shown. This matters a lot, because the same technology could be used to impersonate someone.

On Synthesia, the steps are laid out on its avatar page. You upload a photo, or record a short video to capture your movements. You can clone your voice or pick a stock voice. Then you record a live consent statement before the avatar is generated. The same page says its stock avatars need no filming, consent process or configuration, since the people behind them are already covered. Its pricing page shows a limit by plan: 5 Personal Avatars on Pro and unlimited on Enterprise.

HeyGen describes its Personal Avatar as a digital twin that only appears with the person's verified permission. The avatar page doesn't spell out the verification steps, so check the exact process in the product before you plan around it. Its pricing page says the Free plan includes one Custom Video Avatar. The Creator plan lists a Custom Video Avatar with your own voice and likeness, and the Business plan includes 5 Custom Video Avatars with Avatar V.

In practice, the consent rule means you can't make an avatar of your boss, a celebrity or a client without that person taking part. If your plan is a face for the whole company, such as a founder or a trainer, get written agreement first. Settle what happens to the avatar when that person leaves.

Languages and dubbing

Both tools lean on language reach, which is one of the main reasons to use an avatar instead of a camera.

Synthesia says the same video can be published in 140+ languages without a new recording. Its avatar page says a personal avatar can narrate a script in over one hundred languages. On the pricing page, one-click translations into 140+ languages appear under the Enterprise plan. Synthesia also has separate AI dubbing and video translation products, which its navigation describes as dubbing videos in any language and translating them in one click. On its plans, dubbing draws on the same credit pool as video creation.

HeyGen's pricing page lists 30+ languages on the Free plan and 175+ languages and dialects from the Creator plan up. The Pro plan adds the ability to edit and proofread translation scripts, which is useful when a machine translation needs a human check before it goes out.

Colossyan's comparison gives slightly different counts (175+ for HeyGen and 160+ for Synthesia), which shows that the numbers shift and depend on whether you count dialects or voices. Language count is a poor guide anyway. What matters is whether your target language sounds natural, so make a short test video in it and have a native speaker listen.

Templates, editing and workflow

The two editors feel different. Colossyan's review describes Synthesia's editor as more structured, with slide-style layouts that feel familiar to PowerPoint users. It describes HeyGen's as more flexible but with less guidance, which suits experienced users and can confuse new ones. That is a competitor's view, but it matches how both companies pitch themselves.

On the facts from the providers' own pages: HeyGen's comparison table lists 75+ video templates, PowerPoint and PDF imports, saving designs as templates, and a full-access AI Studio Editor. Synthesia lists pre-built libraries and templates, an AI Video Assistant from the Starter plan up, branded video pages and interactive videos on Pro, and Brand Kits on Enterprise.

For teams, the two plans diverge. HeyGen's Business plan adds a shared workspace, centralised billing, SAML/SSO (single sign-on), a brand kit and asset library, SCORM export and LMS integrations, plus integrations with n8n, Make, HubSpot and Zapier. SCORM is a standard format for loading training content into a learning management system. HeyGen charges $20 per seat per month to add team members. On Synthesia, SCORM export, SAML/SSO, live team collaboration and Brand Kits are listed under Enterprise, which has custom pricing.

Plans, free tier and prices

Both tools use credits, so the headline price tells only part of the story. Here is what each provider's pricing page says.

Synthesia lists four plans. Basic is $0 per month with 500 credits, a free allowance of 10 minutes of Studio video creation or dubbing, and a Synthesia watermark on videos. Starter is $19 per month ($9 for the first month) with 1,250 credits, which the page says is about 12 minutes of video, and it removes the watermark and lets you download. Pro is $89 per month ($49 for the first month) with 6,000 credits, about 60 minutes of video, 5 Personal Avatars and 5 guests, with higher tiers up to 48,000 credits per month. Enterprise has custom pricing.

HeyGen lists a Free plan at $0 with 3 watermarked videos a month, up to 1 minute each, and access to Avatar IV and one Custom Video Avatar. Creator is $29 per month with 600 credits, 1080p export, no HeyGen branding and videos up to 30 minutes. Pro is $49 per month with 1,000 credits, 4K export and videos up to 30 minutes. Business is $149 per month with 1,500 credits, videos up to 60 minutes, 5 Custom Video Avatars and the team features above. Enterprise is by contacting sales. The page offers 2 months free on yearly billing.

Prices checked in October 2026 on the pages cited; they change often, check the provider's page before you pay.

Don't compare the monthly prices alone. A Synthesia credit pool and a HeyGen credit pool are not the same unit, so compare them in minutes of finished video. Synthesia's page says 100 credits per minute of video in its estimator. HeyGen's page doesn't state a clear credits-per-minute rate in the text I could read, so run a real test before you commit.

Usage rights, limits and risks

Neither provider's pricing or avatar page spells out the commercial usage terms in plain language. HeyGen's Enterprise tier mentions custom commercial terms. Before you publish paid ads or client work, read each company's terms of service for ownership of the output, restrictions on stock avatars, and what happens to your content if you cancel. This is a place where I'd rather you check than assume.

Other limits to keep in mind:

• Watermarks and caps. Free plans on both tools put a watermark on videos and cap length or volume, so they are for testing, not publishing.
• Compliance. Colossyan's comparison says neither platform had published HIPAA compliance documentation as of March 2026. If you work in healthcare or finance, ask each vendor for security and compliance documents directly.
• Disclosure and trust. Viewers may not like finding out late that a presenter is synthetic. Consider labelling AI presenters, and some platforms and countries may require it.
• Evidence claims. Synthesia cites a UCL report and a USC Marshall study on engagement and knowledge transfer. These are the vendor's own selection of research, so read them before relying on the claim.
• Hidden costs. Extra seats, re-rendering after script edits, and credits spent on dubbing can add up.

How to choose and get started

Start with your use case, not the feature list. Write down how many videos you make a month, how long they are, how many languages you need, how many people edit, and whether the video has to load into a learning management system.

Then run the same test on both free plans. Use one script of about 60 seconds, including a product name and a number, since those often reveal pronunciation problems. Pick a stock avatar for the test, then check lip-sync, gestures, voice quality and how easy the editor feels. Render the video in one second language and have a native speaker review it.

If a personal avatar matters, try it once with your own face and read what each tool asks for during consent. Then look at the team side: roles, shared templates, SCORM, SSO and billing. Only after that compare the price for the minutes you need.

Verdict by use case

These are my recommendations, based only on the facts above, not on my own testing.

• Training and onboarding: Synthesia looks like the better fit if your team likes structure, because of its slide-style editor and its Enterprise features (SCORM, SSO, Brand Kits). HeyGen's Business plan also offers SCORM and LMS integrations, so it stays a real option, especially if you want to start at a lower fixed price.
• Marketing and sales: HeyGen is built around these uses by its own description, with a big avatar library, a wide language list and integrations with HubSpot, Zapier and Make on Business.
• Social video and creators: HeyGen's Creator plan at $29 is the cheaper entry to a paid plan without a watermark, and its templates and imports suit fast, short work. Synthesia's Starter at $19 is cheaper on paper but is sized in minutes of video, so check how many you need.
• Multilingual localisation: Both claim wide coverage. HeyGen lists a longer language list from its Creator plan, while Synthesia puts one-click translation into 140+ languages under Enterprise. Test your languages first.
• Just exploring: Use both free plans. Synthesia gives you 10 minutes of video to try, and HeyGen gives you three short watermarked videos a month.

Frequently asked questions

Is Synthesia or HeyGen more realistic?

Both claim to be the most realistic, and neither claim is independent proof. Some reviewers, such as Colossyan, say HeyGen looks more expressive in short clips. Test the same script on both free plans and decide by eye.

Can I use my own face and voice?

Yes, on both. Synthesia asks you to record a live consent statement, and you can optionally clone your voice. HeyGen says a Personal Avatar appears only with the person's verified permission. Plan limits on how many custom avatars you get differ by plan.

Do they have a free plan?

Yes. Synthesia's Basic plan is $0 with 500 credits and a watermark. HeyGen's Free plan is $0 with 3 watermarked videos a month of up to one minute each. Both are meant for trying the tools, not for publishing.

Can I use the videos commercially?

The pages I read don't set out commercial rights in plain terms, so read each provider's terms of service, particularly for ads and client work. If it matters, ask the vendor in writing.