An AI tool for 2D animators that generates the clean line-art inbetweens between your drawings — so your hours go to the keys, the timing, the acting. Your line, your call on every frame.
Your keyframe → MotionCel inbetweens → your keyframe
MotionCel is a tool for animators who already know what they're doing. You draw the keyframes that define the motion — MotionCel fills the line-art frames in between. You stay in the driver's seat: keep what works, redraw what doesn't.
// MVP-honest: we're early. We'd rather under-promise and show you exactly what it does.
Inbetweening is most of the frames in a sequence — and most of it is mechanical: tracing the path between two drawings you've already made.
That's time not spent on the keys, the timing, the acting — the decisions only you can make.
Animators draw 1 in every 5–10 frames. The rest is mechanical inbetweening — tracing between drawings you've already made.
↗ Barroso et al., Computer Graphics Forum 2024It's the most repetitive job in animation — hours retracing paths between keys you nailed in minutes.
Every AI video tool works on rendered footage. None work on raw black-and-white line art — the format you actually draw in.
Right now, MotionCel generates clean line-art inbetweens — the frames between two of your line drawings.
Make the first and last drawing of an action — exactly like you always have. Clean black-and-white line art, any style.
// your hand · your lineHand over your two keyframes. MotionCel generates the inbetween frames as clean line art in the same style you drew. Line-art inbetweens are what it does today.
// line-art inbetweensScrub through the result. Keep the frames that work, regenerate the ones that don't, redraw anything by hand. Nothing ships without you.
// you decide what's canonMotionCel exists to give 2D animators their time back — not to take their job. You draw the keyframes that carry the performance; we handle the repetitive frames in between. We don't train on your art, and we won't pretend the machine is the artist. It isn't. You are.
We don't train models on your drawings. Your keyframes generate your inbetweens — nothing else, ever.
Regenerate any frame, redraw it by hand, or throw the result out. MotionCel proposes; you decide what's canon.
Designed alongside 2D animators who do this for a living — for their workflow, not to replace it.
We're onboarding animators in small batches. Join the waitlist and we'll reach out when your spot opens — no spam, just one email when it's time.