Turn your app into a narrated demo without recording
Nobody enjoys re-recording a demo because one click went wrong. One of these three never asks you to click at all.
Feature comparison
Key Insights
Loom records you doing it. Synthesia builds a presenter. QuickPeek drives the app itself and narrates what it did.
The short version
All three end with a video, and they get there in completely different ways. QuickPeek walks through your product, captures the run and narrates it, so the demo is generated rather than performed. Loom is the screen recorder everyone already knows, which means a retake every time you fumble a step. Synthesia builds a polished avatar reading a script, which is lovely for a training module and strange for a product walkthrough. Retakes are the real cost here, and only one of the three removes them.
What actually separates them
The split is whether an AI assistant can produce the video or only help you plan it. QuickPeek ships MCP tools, so an assistant lists what a demo can cover, generates one from a script, picks the voice. Opens the result in an editor for a trim. That turns a demo into something you ask for between two other tasks. The screen recorder still needs your hands and your voice, on the day, in one take.
What you get free
QuickPeek and Loom both have a free tier you can live on for a while. QuickPeek's covers real generated demos rather than a watermarked sample. Loom's free plan caps recording length and the number of videos you keep. Synthesia's free route is a short trial video, which is enough to judge the avatars and not enough to ship with.
Strengths and weaknesses
Verdict

Demo videos for your app in under two minutes

QuickPeek wins for a maker who needs a demo video today and does not want to be on camera.
Who should pick what
Someone shipping an app who needs a demo on the landing page today should pick QuickPeek. A person explaining a bug to a colleague in two minutes should open Loom and stop reading here. A team producing training modules in eight languages should pick Synthesia. Anyone who dreads hearing their own voice on a recording has one obvious option of the three.
Absolute beast