Frame interpolation for iPhone
Turn 30fps video into 60 or 120fps. Turn a normal clip you already shot into smooth 2× or 4× slow motion. Nothing is uploaded — it all runs on your iPhone.
Frame rate
Both sides show exactly the same motion with a different number of frames. Switch the tabs and compare.
Stretch a 30fps video to 4× and only 7.5 frames per second are left. When AI draws the missing frames, slow motion stays smooth. (Animation recreated to show the difference.)
Use cases
The moments you can't reshoot are the ones worth fixing afterward. Each guide walks through the how.
Turn a normal video into smooth 2× or 4× slow motion after the fact.
See how →Add frames to a 30fps swing so it slows down without stuttering.
See how →Change the motion, not just the number — and why most converters don't.
See how →Why the speed option is missing for 30fps videos, and what to do instead.
See how →When converting to 120fps is worth it on a ProMotion iPhone — and when it isn't.
See how →Find out in a minute whether it's playback, settings or missing frames.
See how →Features
An AI model called RIFE looks at neighboring frames and draws the frame that belongs between them. No frame duplication.
Forgot to shoot in Slo-mo? Do it afterward. Previewing is free; saving slow motion requires Pro.
Export at 30, 60 or 120fps, at the original size or anywhere from 480p to 4K.
See the original and the result on one screen and drag the divider before you save.
Output frame rate, duration, file size and processing load are shown before you start.
Videos are processed in order, with a notification when each is done. Queuing several and background processing are Pro.
Interface
Every setting tells you what it changes.
On-device
All AI processing runs on your iPhone itself, using Core ML and the chip's Neural Engine. Your videos are never sent to a server. No account, no upload, no waiting in line. It even works in Airplane Mode.
Pricing
Not a subscription. One purchase, no recurring fees.
$0 (just download it)
See the App Store for the price
In-app purchase — buy once, it never expires. Moving to a new iPhone? Tap "Restore Purchase."
FAQ
Convert videos up to 10 seconds to as high as 60fps and save the result. For longer videos, the first 10 seconds can be trimmed and tried free. You can also create 2× and 4× slow motion and preview it; saving slow motion requires Pro.
No. Pro is a one-time, non-consumable in-app purchase — no monthly or yearly fees. On a new iPhone, tap "Restore Purchase." See the App Store for the price.
No. Frame interpolation makes motion smoother; it doesn't change resolution, noise or blur. See what frame interpolation is.
No. Everything runs on your iPhone and works in Airplane Mode. The app only goes online for App Store pricing, purchases and restores.
iPhones with iOS 16 or later. Heavier settings use a lot of memory, so on lower-memory models (roughly iPhone 12 and earlier) lower the inference resolution or split long clips. It also runs on iPad as the iPhone version, but it's tested on iPhone.
Guides
Choppy video has more than one cause. Start with the most-read guides.
Start with one clip you already have — 10 seconds, free.
Free to start · iPhone with iOS 16 or later
