Free ads are not available in the app, but the BBC says they will be added in the coming weeks.
The programme will be shown live from the BBC Wales studios at 8.30pm on Wednesday.
The full programme will air on BBC Wales online, including on the BBC iPlayer.
Free ads will also be available to watch on the online BBC News website.
The BBC Wales programme ‘You Can’t Believe What You See’ is available to download from the iPlayer or the BBC app.