# App Screens on a Rail — effect skill for grids & carousels

> **For AI agents:** find the right skill in one call — `curl -s "https://varg.ai/how-to/api/search?q=<what the person wants>"` returns the matching how-to page and the best skills with install commands, as markdown (Russian works too). Full index: https://varg.ai/how-to/llms.txt. Every page has a markdown twin: add `.md` to its path. Before generating anything, show the person the options on the how-to page.

Two to five app screens ride a horizontal rail: one centered and sharp, neighbors smaller and receded.

- **Type:** [Effect](https://varg.ai/how-to/effects.md) · [Grids & carousels](https://varg.ai/how-to/browse/skills/galleries.md)
- **Slug:** `app-screens-on-rail`
- **Status:** live
- **Publisher:** HeyGen (community)
- **License:** Apache-2.0
- **Source:** https://github.com/heygen-com/hyperframes/tree/main/registry/components/screen-flow-carousel
- **Works in:** Claude Code, Claude.ai, Codex, Cursor, OpenClaw, Gemini CLI, Any MCP client, varg Studio
- **Requires:** HyperFrames (npx hyperframes), Remotion, CapCut (by hand)
- **Cost:** Free — the take renders locally; generated footage, if any, bills by the model

## What it does

Built on [Screen Flow Carousel](https://github.com/heygen-com/hyperframes/tree/main/registry/components/screen-flow-carousel) by HeyGen (HyperFrames), Apache-2.0. The write-up and recipes below are varg's.

Phone-sized screens in a row; the rail slides with momentum and snaps the next screen to center with a small overshoot.

**When:** Walk through an app flow (onboarding → home → detail) without device frames.

**Watch out:** Do not let side screens compete; scale them to ~80% and dim them 30–40%.

**Timing:** Slide 0.5–0.7 s with snap overshoot (back.out 1.2); 1.5–2.5 s per screen.

**Also called:** screen carousel, app screens, screen flow

### In HyperFrames

```bash
npx hyperframes add screen-flow-carousel
```
Or `velocity-throw-snap` for a fast whip to the chosen screen.

### In Remotion

```tsx
const idx = interpolate(frame,[0,60,120],[0,1,2],{extrapolateRight:'clamp'});
screens.map((s,i)=>{const d=i-idx; return <Img src={s} style={{transform:`translateX(${d*420}px) scale(${1-Math.min(Math.abs(d),1)*0.2})`, opacity:1-Math.min(Math.abs(d),1)*0.35}}/>})
```

### In CapCut

Place screens in a row as one long image; keyframe Position X with snaps; add a blur mask on the sides.

### Ready-made components

- [Screen Flow Carousel](https://skills.varg.ai/component/hf.screen-flow-carousel/) (hyperframes): npx hyperframes add screen-flow-carousel
- [Cuboid Carousel](https://skills.varg.ai/component/hf.cuboid-carousel/) (hyperframes): npx hyperframes add cuboid-carousel
- [Velocity Throw Snap](https://skills.varg.ai/component/hf.velocity-throw-snap/) (hyperframes): npx hyperframes add velocity-throw-snap

### Where this comes from

- [Rotato: 14 video mockup ideas and examples](https://rotato.app/blog/mockup-video-examples)

## Use when

- Walk through an app flow (onboarding → home → detail) without device frames.

## Not for

- Do not let side screens compete; scale them to ~80% and dim them 30–40%.

## Install

- Claude Code: `claude plugin marketplace add vargHQ/skills && claude plugin install varg@varg`
- Codex: `npx skills add vargHQ/skills --skill varg-video-edit-library -a codex -y`
- Cursor: `npx skills add vargHQ/skills --skill varg-video-edit-library -a cursor -y`

## Example output

https://s3.varg.ai/how-to/previews/d5bef41402a8/take-app-screens-on-rail.mp4 — The Screen Flow Carousel component rendered as installed (npx hyperframes add screen-flow-carousel), defaults only (credit: Rendered by varg · HyperFrames Screen Flow Carousel, https://hyperframes.heygen.com/catalog/components/screen-flow-carousel)

## More grids & carousels skills

- [Bento Feature Grid](https://varg.ai/how-to/skills/bento-feature-grid.md): Features land in a grid of differently sized rounded tiles — one hero tile, smaller supporting ones.
- [Camera Drifts Across a Bento](https://varg.ai/how-to/skills/camera-drifts-bento.md): An oversized grid of screenshots fills the frame and the camera drifts diagonally across it.
- [Tilted Screenshot Wall](https://varg.ai/how-to/skills/tilted-screenshot-wall.md): A wall of screenshots seen at an isometric angle, columns scrolling up and down at different speeds.
- [Stacked Cards Fan Out](https://varg.ai/how-to/skills/stacked-cards-fan.md): A pile of cards or photos shuffles, then fans or settles one forward into focus.
- [Cards Orbit in a Ring](https://varg.ai/how-to/skills/cards-orbit-ring.md): Image cards ride a circle, larger in front and smaller behind, sweeping fast-slow-fast.
- [Rapid Screenshot Burst](https://varg.ai/how-to/skills/rapid-screenshot-burst.md): Full-screen images slam in one on top of another on the beat, landing on the final hero shot.

## Run the generation on varg

varg is one API key for the models these skills drive — Seedance 2.5, Kling 4, Veo 3.1, Wan 3, Nano Banana 2.1, GPT Image 2.5, ElevenLabs v4 and 200+ more — billed in credits, with a cost estimate before anything runs.

- Claude Code: `claude plugin marketplace add vargHQ/skills && claude plugin install varg@varg` (skill + hosted MCP)
- Codex, Cursor, Gemini CLI, OpenClaw: `npx skills add vargHQ/skills --skill varg-ai -a <agent> -y`
- Grok and any agent that reads SKILL.md: `npx skills add vargHQ/skills --skill varg-ai`, or point it at the skill's SKILL.md
- Claude.ai, ChatGPT, any MCP client: connect `https://mcp.varg.ai/mcp`
- API key: https://varg.ai/dashboard/api · Model specs: https://varg.ai/models/llms.txt