What's the actual difference between a tool like Runway and a tool like HeyGen?

Runway, Pika, Luma AI, and Kaiber are general text/image-to-video generators — you describe a scene or motion and get a video clip. HeyGen and Synthesia are built specifically around avatar-led video — a person (real or synthetic) speaking to camera, often for training, marketing, or localized content in many languages.

Does an avatar video tool need a different kind of consent than a general video generator?

It raises a different question by nature: an avatar tool is generating a representation of a person speaking, which makes likeness rights and consent a live consideration in a way that a landscape or motion-graphics generation tool isn't. That's a legal and policy question for your team to work through with the vendor, not something Crail's vendor data resolves on its own.

Choosing a generative video tool

"Generative video" splits into two different products — open-ended text-to-video generation and avatar/presenter video — and the vendor you want depends on which one you're actually making.

“Generative video” covers two genuinely different products. One is open-ended text-to-video or image-to-video generation — you describe a shot and get a clip. The other is avatar or presenter video — a person, real or synthetic, speaking to camera, usually for training, marketing, or multilingual content. Vendors in this category specialize in one or the other, and matching that to what you’re actually trying to produce matters more than comparing generic feature lists.

General video generation

Runway (Gen-4/Gen-4.5), Pika, Luma AI (Dream Machine, Ray models), and Kaiber are all built around open-ended video generation from text or image prompts, per Crail’s data. Kaiber leans specifically toward stylized, artist- and musician-oriented output rather than general-purpose footage. If what you need is a video clip that doesn’t involve a person talking to camera, this is the relevant set.

Avatar and presenter video

HeyGen and Synthesia are both built around avatar-led video — turning text into a person speaking on screen, with Synthesia’s data specifically noting 160+ language support and HeyGen’s including translation and interactive video agents. If your use case is training content, product explainers, or localized presenter video, these two are the direct fit rather than the general generators above.

Pricing and access

Entry pricing ranges from $8/month (Pika) to $30/month (Luma AI) across the vendors that publish a price, per Crail’s data; Kaiber publishes no cheapest-paid price. All six vendors here are self-serve — none require a sales call to buy. Free tiers are common: Runway, HeyGen, Pika, and Synthesia all offer one; Luma AI and Kaiber do not.

Agent and MCP access varies sharply

Runway, HeyGen, and Pika all publish an MCP server, per Crail’s data — Pika’s notably exposes 58 media tools, suggesting deeper agent-driven control over the generation pipeline than a simple prompt-in-video-out API. Luma AI, Synthesia, and Kaiber have no MCP server on record. Compliance certification also varies widely: Runway carries SOC 2 Type 2, HeyGen adds GDPR/CCPA/EU-US Data Privacy Framework, and Synthesia carries SOC 2 plus ISO 42001 — while Pika, Luma AI, and Kaiber have no certifications on record.

Where to start

Full pricing, MCP access, and compliance details for all six vendors are on the Generative Video AI category page, or see a direct comparison in Runway vs HeyGen.