yukmmz — Web Apps

Small browser-based tools. No install, no server — everything runs client-side.

Make any of these apps your own, with AI

Video Frame Picker

Mark moments in your videos frame by frame and get their exact times as a CSV. Works through a whole folder of videos and resumes where you left off. Videos are never uploaded.

▶ Watch demo
Open App → Source

Click to Get Coord

Click points on a video or image and read them back as real-world coordinates, calibrated from two or three reference points. Export as CSV, images, and .mat files that Python and MATLAB can read.

▶ Watch demo click-to-get-coord demo
Open App → Source

Multitask Timer

More and more of us juggle several tasks while waiting for AI agents to finish. Track the time spent on each task side by side, so no single task eats up all your time.

▶ Watch demo multitask-timer demo
Open App → Source

Video Loop Player

Pick one or more local videos and play them back-to-back in a loop. Swipe on the screen to step frame by frame, forwards or back, and change the speed. Also handy for leaving a video running on a screen at a poster session.

▶ Watch demo
Open App → Source

Batch Image Cropper

Crop many images in one go: cut every image at the same size and position, or align just the position, size or aspect ratio and frame each one yourself. Images are never uploaded.

▶ Watch demo batch-image-cropper demo
Open App → Source

Mask Annotator

Trace over an object with Apple Pencil and the mask follows its shape. Reuse the previous frame's mask by just moving and rotating it, clear everything outside a circled area at once, and rely on autosave, resume-from-ZIP and ZIP export.

▶ Watch demo mask-annotator demo
Open App → Source

Even Dice

A dice-rolling app using Softmax Decay to keep results statistically even over time — recently rolled faces become less likely.

▶ Watch demo even-dice-app demo
Open App → Source

App Remix Kit

Make these apps your own, with AI

The apps here are kept simple, so you can reshape them however you like. This kit lets an AI agent such as Claude Code or Codex walk you through it — even if you have never programmed or used GitHub.

  1. Add the kit to your AIDownload it and place one folder. The AI can do this for you too.
  2. Say what you want"I want my own version of this app that does …" — the AI gets the code, changes it, and lets you try it step by step.
  3. Publish at your own URLIf you like, it goes live on GitHub Pages. The AI also helps you create a GitHub account.
Get the kit → Free · MIT License · the original apps stay unchanged

Want an app that doesn't exist yet?

Tell me what kind of app you would like. Feedback on an existing app is welcome too — please send it with the FB button inside that app.