AI video tools now cover very different jobs: generating original video clips from a text prompt, turning a script into a talking-head presenter video, or producing training and marketing videos without ever filming anyone. Runway, Synthesia, and HeyGen each specialize in one of those jobs rather than trying to do everything.
Picking the wrong one usually means paying for features you don't need — a generative video tool like Runway won't help you make a presenter-style explainer, and an avatar tool like Synthesia won't generate an original cinematic clip from a prompt. Here's how the pricing, free plans, and actual use cases compare.
Quick Comparison
| Tool | Price | Free Plan | Verified |
|---|---|---|---|
| Runway | $15/month (billed annually, Standard plan) | 125 one-time credits, no recurring free tier | 2026-09-15 |
| Synthesia | $29/month (billed annually, Starter plan) | 3 minutes of video/month (Free plan) | 2026-09-15 |
| HeyGen | $29/month (billed annually, Creator plan) | 3 credits/month (Free plan) | 2026-09-15 |
Runway
Verified 2026-09-15Overview
Runway is a generative video tool that creates original video clips from text prompts or a reference image. It's built for creators making short, stylized, or experimental clips rather than corporate presenter-style videos.
- Text-to-video and image-to-video generation for original short clips
- A range of creative editing tools (motion brush, inpainting) built around generated footage
- Fast iteration — multiple short clip variations can be generated from one prompt
Creators and marketers who want original, stylized short clips rather than a presenter talking to camera.
- The most creatively flexible of the three for original, stylized video content
- Useful for social content, concept visualization, and creative experimentation
- The 125 free credits are one-time only, not a recurring monthly allowance
Synthesia
Verified 2026-09-15Overview
Synthesia turns a written script into a video of an AI avatar speaking it aloud, in dozens of languages, without filming a real person. It's aimed squarely at corporate training, onboarding, and explainer videos where a presenter reads a script to camera.
- A large library of realistic AI avatars available to present your script on camera
- Multi-language voiceover generation from a single written script
- Built for corporate training and onboarding video formats specifically
Businesses producing training, onboarding, or explainer videos that need a consistent on-camera presenter without filming.
- No filming, actors, or studio required for a full presenter-style video
- Strong multi-language support for global training or onboarding content
- The free plan is capped at just 3 minutes of video per month
HeyGen
Verified 2026-09-15Overview
HeyGen covers similar ground to Synthesia — script-to-avatar video generation — but leans more toward marketing and social content creators, with features geared at short-form video and personalized outreach clips rather than long training modules.
- Avatar video generation aimed at short-form marketing and social content
- Video translation and lip-sync tools for repurposing existing footage into other languages
- Personalized video generation at scale for outreach or sales use cases
Marketers and creators who want short, personalized avatar videos for social media or outreach rather than long-form training content.
- Better fit than Synthesia for short-form marketing and social clips specifically
- Video translation/lip-sync features go beyond pure avatar generation
- The free plan's 3 credits/month is only enough for very light testing
Which Tool Is Best
If you want to generate original, creative video clips from a prompt, Runway is the only one of the three built for that job. If you need a consistent presenter reading a script for corporate training or onboarding, Synthesia's avatar library and multi-language support are purpose-built for that. If your priority is short-form marketing or personalized outreach video at scale, HeyGen fits that use case more precisely than Synthesia.
Best Overall Recommendation
Choose based on the video you actually need, not general "best AI video tool" rankings — these three barely overlap in purpose. For most small businesses making training or explainer content, Synthesia is the safer starting point; for social and marketing clips, HeyGen or Runway are better fits depending on whether you want an avatar presenter or original generated footage.
FAQ
What is the difference between Runway and Synthesia?
Runway generates original video clips from text or image prompts, aimed at creative and experimental content. Synthesia turns a script into a video of an AI avatar presenter speaking it aloud, aimed at training and corporate video.
Which AI video tool has the best free plan?
None of the three offer a generous recurring free plan. Runway gives 125 one-time credits, Synthesia gives 3 minutes/month, and HeyGen gives 3 credits/month — all suitable only for light testing before you commit to a paid plan.
Can HeyGen or Synthesia make a video of a real person without filming them?
Both tools can generate avatar-based videos from a script, either using a stock avatar or, with consent and proper account permissions, a custom avatar based on a real person recorded through the platform's own tools.
Is Runway good for making a full explainer video?
Runway is better suited to short, original video clips than long-form explainer videos with a consistent presenter. For explainer or training-style videos, Synthesia or HeyGen's avatar tools are a closer fit.
Do these tools support languages other than English?
Synthesia is the strongest of the three for multi-language voiceover generation from one script, which is one of its core features for global training content. HeyGen also supports video translation and lip-sync across languages.
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Pricing shown was accurate at the time of publishing and may change — verify on the official site.