Stride Lab for Aseprite

Find a starting movement speed for your side-view walk or run animation.

Stride Lab previews your artwork over moving ground inside Aseprite. Mark the same planted foot in two or more frames, fit a speed, then compare it with the animation. You can adjust the preview without exporting a new sprite sheet each time.

Free or Full?

Free: motion preview, playback and speed controls, art-scale conversion and a two-point measurement on your own animation. Marks last for the current session. Download Free.

Full — $5 once: measure up to four separate foot contacts and 256 marked frames per clip, save marks inside your .aseprite file and export a JSON calibration report.

Both include an editable 16-frame Warped City walk and a guide that shows which foot positions to measure.

What the measurement means

The fit uses the points you mark; it does not recognize feet or guarantee a slide-free animation. A two-point fit can be exact even with the wrong marks. Check the result in your game at the intended camera scale.

Supports forward clips, canvases up to 512 × 512 pixels and clips up to 256 frames. Mark one uninterrupted planted stretch per contact and split contacts at the loop boundary. The extension leaves rendered artwork unchanged.

Before downloading

Requires Aseprite, purchased or built separately. Tested with Aseprite 1.3.18.6 on Linux and 1.3.18.6-dev source builds on Windows 11 and Intel macOS; Apple Silicon is untested.

Install through Aseprite’s Extensions preferences, then open Sprite → Stride Lab. Open it without a document to load the example. Everything runs locally.

License and help

Use your licensed edition for personal or commercial work. Your art, marks and reports remain yours. Private modifications must respect the Free/Full edition rights; the extension may not be redistributed.

The included Warped City artwork by Luis Zuno (Ansimuz) is separately CC0. Full terms and artwork provenance are included.

For help or feedback, comment below or email david@luxore.net with your edition, Aseprite version, operating system and steps to reproduce.