How to record reaction videos on iPhone

To record a reaction video on iPhone: open ReactCam, record your screen or import the video you want to react to, tap FaceCam to record your reaction in picture-in-picture while the video plays, then export in up to 4K. No computer, no green screen, and the base app is free.

What you need

• An iPhone.
• ReactCam (free on the App Store).
• The content you want to react to — either something on your screen, or a video saved in your photo library.

Step by step

1. Create a project. Open ReactCam and start a new project. Projects save automatically, so you can leave and come back anytime.
2. Get the video you're reacting to. Two ways:
   • Record your screen — capture any app, game, or content on your iPhone with one tap.
   • Import from your library — bring in any saved video: downloaded clips, music videos, sports highlights, family footage.
3. Add your facecam. Tap FaceCam and hit record. Your reaction records in sync while the video plays, appearing as a picture-in-picture overlay you can drag anywhere and resize with a pinch.
4. Shape the look. Mirror the camera, adjust opacity and volume, round the corners from square to circle, and blur or remove your background — no green screen needed. You can add more than one facecam to the same project.
5. Add subtitles automatically. ReactCam generates subtitles from your recorded voice; style, edit, or delete any line before export.
6. Polish it. Trim clips, merge recordings with crossfade transitions, and add text overlays, filters, or animated GIPHY stickers.
7. Export and share. Mix the volume of screen, facecam, and commentary tracks independently, then export — up to 4K with Pro — ready for YouTube, TikTok, or Instagram.

Tips for better reactions

• Keep the facecam small but visible — a corner placement covers less of the source video and still reads clearly on phones.
• Use subtitles. Most short-form video is watched muted; auto subtitles keep your commentary landing.
• React in one take. Authenticity is the whole point of the format — trim afterwards instead of re-recording.

Ready to record your first reaction?

Frequently asked questions