Synthesia

Synthesia is an AI video platform that turns scripts, slides and documents into videos presented by AI avatars, in more than 140 languages.

Synthesia lets businesses create professional videos without filming, using AI avatars and voiceovers in more than 140 languages. Its AI assistant turns a prompt, link, file or PowerPoint deck into an editable, on-brand video, and hundreds of avatars can be customised with outfits and backgrounds, or a company can create its own. Videos can include calls to action, branching scenarios and quizzes, and existing videos can be translated with voice cloning and lip sync. Sessions add live roleplay practice and avatar-led surveys and interviews, and a real-time avatar can be embedded in a product. Synthesia says more than 90% of the Fortune 100 use it, mainly for training and internal communications, and it offers an API and apps inside Claude and ChatGPT.

Synthesia at a glance

Best for: HR, Marketer, Founder, Support, Director
Runs on: Web, API
Pricing: Free plan with 10 minutes/month; Starter $29/month; Pro $89/month; Enterprise custom
Released: July 2020
Category: AI video tool
Website: synthesia.io

Key features

Hundreds of AI avatars plus custom personal avatars
Videos from prompts, links, files or PowerPoint
Voiceovers and translation in 140+ languages
Dubbing with voice cloning and lip sync
Interactive videos with branching and quizzes
Roleplay and survey Sessions with avatars
API and apps in Claude and ChatGPT

Use it for

Produce employee training courses for an LMS
Translate a video library into dozens of languages
Practise sales or management conversations with an avatar

Companions

Tools that articles about Synthesia recommend using with it, each with its job.

Claude — Turns SOPs and onboarding docs into avatar video scripts.
ElevenLabs — One branded narrator voice across the training library.
Articulate 360 — Adds quizzes and interactivity around the videos for your LMS.
Descript — Software walkthroughs and quick transcript-based edits.
Gemini Notebook — Turns dense internal docs into study guides first.
Notion AI — Embeds the videos, with chapters and captions, in one onboarding page.

Alternatives to Synthesia

HeyGen — Most realistic AI avatars, with lip-synced translation in 175+ languages
Cartesia — It delivers the fastest, most accurate streaming speech models and agents.
Colossyan — Builds video courses from text with 300+ avatars and 100+ languages.
Runway — Leading video model plus editing, upscaling and an agentic collaborator
D-ID — It creates realistic digital humans for video creation and real-time conversations.
Google Vids — Team videos inside Workspace, with Gemini doing the first draft
Opus Clip — Turns one long video into many ready-to-post shorts
Eclatira — Connects voice and video AI agents to APIs and apps without custom integration code.
Captions — Phone-friendly AI editing for talking-head videos and ads
InVideo — AI editing agent on a real timeline, not just a prompt box
Fluxcut — AI agents write scripts, gather footage, and record voiceovers with human approval at every step.
Veed — Fast browser editing with top-quality subtitles and dubbing

All Synthesia alternatives