2026 comparison

The Runway Alternative for Real Footage, Not Generated Video

Written by Chloé, Senior Video Editor · Updated 2026-08-06

Runway generates video. You describe a shot, its models produce it on its servers, and you assemble the result in a cloud workspace alongside images and audio. Montaj is a Runway alternative only in the sense that people arrive at both looking for AI video: it does not generate anything. It takes the footage you filmed and finishes it , subtitles, dead air, audio , on your device.

Download Montaj free

Choose Runway if…

You need a shot that does not exist and cannot be filmed. A generated scene, an image brought to motion, a look no camera in your budget produces.

Choose Montaj if…

You already filmed the video, and what is left is captions, cutting the pauses and cleaning the voice track.

Montaj vs Runway at a glance

Feature	Montaj	Runway
Where your video goes	Nowhere. It stays on your device	Generation and editing both run on Runway's servers
Generating footage that does not exist	Not offered. Montaj has no generative model	The core of the product
Working on footage you filmed	The only thing it does	Possible, alongside generated material
Images and audio in the same workspace	Video only	Video, image and audio together
Developer API	None	Available for building generation into your own tools
Word-by-word subtitles	On-device transcription, editable inline with word-level timing	Not what the product is built around
Works offline	Fully offline after the one-time model download	Cloud generation, it needs a connection
Price	Free today, no watermark	Free tier; paid subscription plans

The honest summary: Runway wins the entire category of video that has to be invented, and Montaj has no presence there at all. Montaj wins the category of video that already exists on your device and needs finishing without an upload.

Why a Runway alternative is rarely another generator

People search for a Runway alternative for two unrelated reasons. Some want a different generator. Others discover, halfway through, that they did not want generated video at all. They wanted their own clip to stop looking unfinished.

This page is for the second group. Montaj has no generative model, no synthetic voice and no stock. It assumes there is a real recording on your device and that the problem is everything around it.

Winner: Depends entirely on whether the footage exists

Privacy

Runway vs Montaj on where the processing happens

Generative models of that size run in data centres; there is no phone-sized version of them and pretending otherwise would be silly. So Runway's architecture follows from its product.

Montaj's follows from its own: the work it does is small enough to run beside you.

On-device transcription, then word-by-word karaoke subtitles with word-level timing.
One-tap silence removal across the clip, reversible and non-destructive.
Neural audio denoising tuned for voice, no queue and no credits.
A real timeline for trims, reordering and B-roll layers with split-screen.

Winner: Montaj, nothing is uploaded

Honest limits

Where Runway wins

If the shot has to be invented, Montaj is useless to you and no amount of on-device processing changes that. Runway also covers images and audio in the same place and exposes an API, neither of which Montaj has any equivalent for.

Montaj is vertical 9:16 only, exports at 1080x1920, single-user, and does not yet save projects, closing one loses it.

Winner: Runway, everything generative

The verdict

Runway is not a competitor, it is a neighbour, and anyone telling you to pick one is confusing two jobs. Runway makes footage that never existed. Montaj works on footage of you, filmed by you, and has no generative model anywhere in it. If what you need is a shot you cannot film, go to Runway and do not look back. If you already pressed record, generation is not the missing piece.

— Chloé, Senior Video Editor

Frequently asked questions

What is the best Runway alternative?

If you want generated video, the alternatives are other generative platforms and Montaj is not one. It has no generative model. If you want to finish footage you actually filmed, Montaj is the strongest on-device Runway alternative, free and with nothing uploaded.

Can Montaj generate video from a prompt?

No. Montaj does not generate video, images or voice. It edits recordings you already have.

Does Runway process my footage in the cloud?

Yes. Generation and editing both run on Runway's servers. Montaj runs its models on your device, so nothing is uploaded.

Is there an AI video app that works offline?

Montaj works fully offline once its models are cached; the only network call it makes is the one-time model download.

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Finish the video you actually filmed

Try Montaj free. A Runway alternative for footage you shot yourself