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HeyGen vs Synthesia

A feature-by-feature comparison of HeyGen and Synthesia across 7 capability categories.

First tool

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Second tool

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Modalities — HeyGen Wins

Modalities: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Text Input	Yes. Text prompting is the primary interface.	No. Auto populated
Image Upload / Vision	Yes. Upload a photo or footage to create an avatar.	No. Auto populated
Image Generation	No. Does not generate still images.	Partial. Auto populated
Voice Mode	No. No voice interface.	No. Auto populated
Video Understanding	Partial. Uploaded video is used for translation and lip-sync, not analysis.	Partial. Auto populated
Video Generation	Yes, requires plus plan. Avatar and stock-to-video generation from a script.	Yes, requires plus plan. Avatar videos generated from a script in the studio.
File Upload (PDF, DOCX)	Partial. Scripts and media, not general documents.	Yes. Auto populated
Code Execution	No. Not a code tool.	No. Auto populated
Audio Input	Yes. Upload a voice recording to clone or drive an avatar.	No. Auto populated
Canvas / Artifact Editor	No. No canvas or artifact panel.	No. Auto populated
Screen Sharing / Computer Use	No. No computer-use capability.	No. Auto populated

Memory & Context — Tie

Memory & Context: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Persistent Memory	No. No cross-session memory of the user.	Partial. Auto populated
Large Context Window	No. Not a language model, so this does not apply.	No. Auto populated
Custom Instructions	No. No global instruction setting.	No. Auto populated
Conversation History	No. Not a chat product, so there is no conversation to configure.	No. Auto populated

Integrations — HeyGen Wins

Integrations: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Web Search / Browsing	No. No browsing capability.	No. Auto populated
Plugins / Extensions	No. No plugin marketplace.	No. Auto populated
API Access	Yes. Video generation API for developers.	Paid Only. Auto populated
Zapier Integration	Yes. Official Zapier integration.	No. Auto populated
Custom GPTs / Bots	No. No agent or bot builder.	No. Auto populated
Real-time Collaboration	Yes. Shared team workspaces on paid plans.	No. Auto populated
Live Social Data Integration
Live Citation Mapping

Developer — Tie

Developer: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Function Calling	No. No tool-calling interface.	No. Auto populated
Streaming Responses	No. Generations are returned complete, not streamed token by token.	No. Auto populated
Fine-Tuning	Partial. Custom avatars and cloned voices, not model fine-tuning.	No. Auto populated
Embeddings API	No. No embeddings endpoint.	No. Auto populated
Structured Output (JSON)	No. Not a language model, so this does not apply.	No. Auto populated
Reasoning / Thinking Mode	No. Not a reasoning model.	No. Auto populated
Local Execution
Open Weights
Multi-Agent Orchestration

Platforms — HeyGen Wins

Platforms: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Web App	Yes. Browser-based; no install required.	No. Auto populated
iOS App	No. No native mobile app; the web app runs in a mobile browser.	No. Auto populated
Android App	No. No native mobile app; the web app runs in a mobile browser.	No. Auto populated
Desktop App	No. Browser only.	No. Auto populated
Chrome Extension	No. No official browser extension.	No. Auto populated

Privacy — HeyGen Wins

Privacy: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
GDPR Compliant	Yes. HeyGen publishes a DPA and serves EU customers.	No. Auto populated
Opt Out of Data Training	Unknown. Needs a read of the current policy before we assert this.	No. Auto populated
Enterprise Privacy Mode	Yes, requires enterprise plan. Enterprise tier with SSO and custom retention.	No. Auto populated

Workspaces — HeyGen Wins

Workspaces: HeyGen compared with Synthesia
Feature	HeyGen	Synthesia
Projects / Folders	Yes. Videos are organised into projects and folders.	No. Auto populated