Runway

Runway is a US company focused on creative video tools, and one of the first to turn AI video generation into a product for working creators. It is not just text-to-video but a set of post-production tools: rotoscoping, object removal, motion tracking, turning a still into a shot with camera movement — all in one interface. For people already producing video, it replaces several applications that would otherwise each need opening.

The generation side is also more controllable than most: camera movement can be specified, an image can anchor the first or last frame to constrain where the shot goes, and existing footage can be restyled. It behaves more like a workbench for professionals than a slot machine.

The limits are duration and consistency. Individual clips are short, and stitching several into something with a narrative struggles to keep characters and settings stable — a problem common to every current video model, not specific to this one.

Key features

• Video generation: Text-to-video and image-to-video, with the higher tiers unlocking stronger models that produce better image quality and motion.
• Camera and keyframe control: Specify pans, tilts, pushes and other moves, or lock the first or last frame with an image so the shot goes where you intend.
• Video-to-video: Restyle existing footage from a prompt or reference image while keeping the original motion.
• AI post-production tools: Green-screen removal, object erasing, motion tracking, frame expansion and more, without hopping between applications.
• Performance-driven animation: Use a video of a real performance to drive a character’s expressions and movement.

How to use

1. Go to the Runway website and sign up with email or a Google account; new accounts get a small free allowance.
2. Open the video generation tool, upload a reference image as the first frame, and describe the action and camera movement.
3. Set duration and aspect ratio and generate. If it misses, adjust the prompt or swap the reference image.
4. For cleanup, switch to the background removal or erase tools within the same project, then export to your editor.

Best for

• Ads and brand pieces: commercial clips that need controlled camera work and a consistent look.
• Independent creators’ post-production: offloading tedious manual jobs like rotoscoping and cleanup.
• Concept films and previs: turning still concept art into moving shots for clients or the team.
• Music videos and experimental work: video-to-video restyling suits visual experimentation.

Strengths and limitations

Strengths

• The most complete toolchain, with generation and post-production on one platform.
• Fine-grained camera and keyframe control, more steerable than prompt-only products.
• Fast-moving product with many features aimed at professionals.

Limitations

• Clips are short, and multi-shot narratives struggle with character and scene consistency.
• The free allowance is small and credits go fast; serious use effectively requires a subscription.
• The site opens from mainland China, but signing in and generating depend on an overseas connection.
• The interface and prompting are English-first; Chinese prompts are understood less well than by Chinese models.