Gummble Ads

App demo video maker

Upload a screen recording of your app, pick a structure, edit the words and timing, export a vertical MP4 you can run as an ad.

7 days free, then $79/month. Credit card required. Cancel before your trial ends to avoid being charged.

  1. Upload your recording. It is checked in the browser (length, size, codec) and stored privately in your workspace.
  2. Pick a structure. The recording is split into the scenes the structure needs; trim each scene to the moment you want.
  3. Edit and preview. Hook, step labels, CTA, colours, phone frame or full screen. Undo any change; every save is a version.
  4. Export. 1080×1920 MP4 at 30 fps, rendered in your browser in about half the ad's length on a recent laptop.
Made with the editor from a QA recording of our own app, TeachKeep, with test data: three-step structure, 21 s. Rendered in 9.2 s in one run on an M4 Mac mini; render time depends on the device. Our own demo, not a campaign result. How it was made.

Structures you can edit today

Hook + demo

One promise on screen, then the feature working in one continuous clip, then the call to action.

Use this structure →

Three-step walkthrough

Three short clips from your recording, each labelled with the step it shows.

Use this structure →

Input → result

What goes in, then what comes out. Only real states from your app.

Use this structure →

What a demo ad needs

See how these show up in the Tinder Music Mode, MyFitnessPal AI Coach and Opal teardowns, and the structures with timing on mobile app promo video templates.

Questions

Is this an AI video generator?

No. It does not invent footage, voices or fake UI. Every frame of the app comes from your recording; the editor adds the hook, step labels, layout, colours and an end card, and you control every word.

What do I need?

A screen recording of the flow you want to sell (iOS: Control Centre → Screen Recording; Android: the built-in recorder), as MP4, MOV or WebM up to 95 MB. Our walkthrough shows the whole process on one of our own apps.

What do I get?

A vertical 1080×1920, 30 fps H.264 MP4 (with AAC audio when you keep the recording's sound or add your own music), up to 30 seconds. Text is placed inside the TikTok, Reels and Shorts safe zones. The project stays editable: change a word and export again.

Where does rendering happen?

In your browser, with the WebCodecs video encoder in current Chrome, Edge and Safari (17+). Your recording is stored privately in your workspace so you can reopen the project; it is never published or used for anything else.

What does it cost?

$79/month after a 7-day free trial. A credit card is required to start the trial; cancel before it ends and you are not charged. The trial includes 5 successful exports (failed exports and re-downloads don't count) and 1 GB of footage. See pricing.

What can't it do yet?

No prompt-based editing, no talking-head or UGC footage generation, one aspect ratio (9:16), and no ad library or competitor intel inside the plan yet. You can open the editor, upload and edit before starting the trial; exporting needs the trial or the plan.