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PhysDraftOpen app

Turn physics problems
into simulations

A learning tool that turns images and PDFs into motion

Read the problem and its diagram.
Explore how the objects connect and move.

Open simulator

Focused on mechanics · Beta

First-time access requires a passkey and account approval.

01Problem image

Entrance exam diagram of a cart and a weight connected by a string over a pulley

02Simulation

Recorded simulation

Diagram source: Osaka Institute of Technology, 2019
See it in motion

From a problem image
to a simulation

Compare the original diagram with its simulation.
Follow the motion in class or while studying on your own.

Original diagramRead from an image
Entrance exam diagram of cart M and weight m connected by a string over a pulley
Simulated with PhysDraftPaused
View larger

What happens after the string breaks?

From connected motion to free fall after the string breaks.

Recorded simulation (edited)

How it works

  1. Example input: a cart and a weight connected by a string over a pulley
    01

    Upload a problem

    Choose an image or PDF with the problem and diagram.

    Example: Osaka Institute of Technology, 2019 ↗

  2. Reviewing the reconstructed cart, pulley, string and weight
    02

    Check the diagram

    Check the shapes, positions and string connections.

    A reconstructed diagram

  3. The cart and weight in new positions after playback
    03

    Play the motion

    Press play and watch how the motion unfolds.

    The simulation in motion

Currently focused on mechanics. This is a beta version; recognition and simulated motion may contain errors.

Physics is
fascinating

We want more people to feel that spark.
We are using technology to change how physics is learned.

About us

About us

We are three students
building new ways to fall in love with physics.

芦澤 知樹

Research & web development

Interned in the Goda Laboratory at the University of Tokyo and under venture capitalist Yasuhiro Yoshizawa. After graduating from Azabu High School, he went on to college in the US and now develops websites and apps. His service YUNAMATCH has reached around 2,000 users and 140,000 cumulative page views.

X @appmakes18
Research, projects & internship

Research

Research intern in the Goda Laboratory at the University of Tokyo from April to September 2026, investigating particle detection using surface-enhanced Raman spectroscopy (SERS) under Yasutaka Kitahama.

Used SERS and a portable 785 nm Raman spectrometer to detect polystyrene particles on gold substrates. Designed comparative experiments varying concentration, particle size and deposited layers, and analyzed their spectra. The concentration model achieved R² = 0.993 and the particle-size model R² = 0.997.

Presented “Detecting Microplastics: Polystyrene Particles on a Gold Substrate” at the University of Tokyo's Intern Talks on September 2, 2026.

Interests include experimental condensed matter physics, quantum materials and superconductivity, scanning magnetic microscopy, and optical spectroscopy.

YUNAMATCH

Built and launched a Pokémon UNITE teammate-finding service in three days. It reached around 2,000 registered users and 140,000 cumulative page views (self-reported at the time of publication).

Visit YUNAMATCH ↗

Venture capital internship

Interned under venture capitalist Yasuhiro Yoshizawa.

飯塚 忠相

Keio University · Faculty of Policy Management

Built TANE, a digital map for school festivals, and received the Director-General's Award from METI's Commerce and Information Policy Bureau at the U-22 Programming Contest 2024. Builds services that solve everyday problems.

X @tada0100
Background & projects

Background

Childhood
Lived in Mexico.
2020.04
Started programming upon entering junior high school.
2023–2024
Developed and operated TANE Project for Toko Gakuen's school festival, replacing paper guides with a digital map. In 2024, 558 people used it over two days.
2024
TANE received the METI Director-General's Award (Product), PSC Award and PCA Cloud Award at the U-22 Programming Contest.Official results ↗
2025
Selected for Mitou Junior with an AI guidebook app. Worked on it for three months before withdrawing to focus on entrance exams.
2026.03
Graduated from Toko Gakuen High School.
2026.04–
Entered Keio University's Faculty of Policy Management.
2026.09
Traveled solo to San Francisco and Los Angeles to visit universities and connect with people in tech.

前嵩西 時春

The University of Tokyo · Natural Sciences I

Coming soon

Use PhysDraft

Go to the app's sign-in page.
First-time access requires a passkey and account approval.

Open app