Web App “Oscilloscope” for Everyone! (Find Teaching Materials with Scratch!)
No Oscilloscope? No Problem! Class Ideas for Visualizing Sound with Scratch and Free Tools
Have you ever wanted to show students the volume or waveform of sound in a science class but found that professional oscilloscopes are just too expensive and complicated to use? Teaching students how to operate them can be a hassle, making it a high barrier to entry for classroom use.
That’s where a digital, oscilloscope-like teaching tool comes in handy! With just a PC or tablet and an internet connection, you can visualize changes in sound in real-time without any special equipment.
Using Scratch to Visualize Sound in Real-Time!
Scratch is a popular programming tool used in elementary and middle schools. You can create a simple program using a microphone input to display sound volume as a real-time graph.
Here’s a great example: oscillo_1 https://scratch.mit.edu/projects/18315338

How to Use:
- Turn on the microphone (you may need to allow permission in your browser settings).
- Click the green flag.
- Make a sound, and… a bar graph will appear and move!
Students will be amazed as they see the concept of sound volume visualized right before their eyes. This simple project is a perfect way to introduce or review the concept that “sound is a wave” without needing any expensive equipment.
Free Web Oscilloscope: “XXY OSCILLOSCOPE”
For those who want to view waveforms more professionally, we recommend this web app. You can use it on any device—PC, tablet, or smartphone—as long as you have a web browser. No app installation is required.

XXY OSCILLOSCOPE https://dood.al/oscilloscope/
This tool captures audio and displays the waveform in real-time. Detailed instructions on how to set it up are available on the website.
Other Useful Tools
- SoundBeam (App) This is a paid app, but it is very useful for teachers to have for experiments and verification.
The web app “XXY OSCILLOSCOPE” introduced in this blog post is a fantastic tool that makes visualizing sound in an educational setting easy, solving the problem of expensive and complicated physical oscilloscopes.
Freqounter (App) This app analyzes the frequencies contained in a sound. It’s great for checking tuning forks or musical instruments.
AFG (Free Software) This is a signal generator app that can produce sounds at a frequency you choose. It’s useful for understanding the concept of pitch.
理科実験の頼れる相棒!簡単操作で周波数を自由自在に設定できる無料アプリ『Audio Function Generator』(AfG)
For Teachers Who Want to Use Scratch in Science Class
Beyond what we’ve covered, Scratch has many other teaching materials for science, including simulations and tools for observation logs. I also have my students create their own teaching materials with Scratch, which promotes inquiry-based learning. You can easily apply these projects to various topics like sound, light, and motion, so I encourage you to explore what’s available.
You don’t need expensive equipment to incorporate visualization into your science lessons. By using Scratch and other web apps, you can create “aha!” moments for your students.
If you know of any other useful tools, please let me know! I’d love to share them in an article.
4月のイチオシ実験!
- 光の魔法CMYウォーターキューブ:光の魔法を体験せよ!水を注ぐと新たな立方体が出現する魔法のような実験です。
テレビ番組・科学監修等のお知らせ
- 4月9日(木)「THE突破ファイル」(日本テレビ )の科学監修を行いました。夜7時〜となります。
書籍のお知らせ
- サクセス15 4月号にて、野球の科学について記事を執筆しました(2026/3)
- 『大人のための高校物理復習帳』(講談社)…一般向けに日常の物理について公式を元に紐解きました。特設サイトでは実験を多数紹介しています。※増刷がかかり6刷となりました(2026/02/01)
- 『きめる!共通テスト 物理基礎 改訂版』(学研)… 高校物理の参考書です。イラストを多くしてイメージが持てるように描きました。授業についていけない、物理が苦手、そんな生徒におすすめです。特設サイトはこちら。

講師・ショー・研究等のお知らせ
- 3/20(金) 日本理科教育学会オンライン全国大会2026「慣性の法則の概念形成を目指した探究的な学びの実践」について発表しました。
- 6/14(日) 千葉大学インスタレーション「探究」にて講師を務めます
- 7/18(土) 教員向け実験講習会「ナリカカサイエンスアカデミー」の講師をします。お会いしましょう。
- 10/10(土) 秘密兵器「帯電ガン」が炸裂!ビリビリ!ドキドキ!静電気サイエンスショー@千葉市科学フェスタ(午後予定)
- 各種SNS X(Twitter)/instagram/Facebook/BlueSky/Threads
Explore
- 楽しい実験…お子さんと一緒に夢中になれるイチオシの科学実験を多数紹介しています。また、高校物理の理解を深めるための動画教材も用意しました。
- 理科の教材… 理科教師をバックアップ!授業の質を高め、準備を効率化するための選りすぐりの教材を紹介しています。
- Youtube…科学実験等の動画を配信しています。
- 科学ラジオ …科学トピックをほぼ毎日配信中!AI技術を駆使して作成した「耳で楽しむ科学」をお届けします。
- 講演 …全国各地で実験講習会・サイエンスショー等を行っています。
- About …「科学のネタ帳」のコンセプトや、運営者である桑子研のプロフィール・想いをまとめています。
- お問い合わせ …実験教室のご依頼、執筆・講演の相談、科学監修等はこちらのフォームからお寄せください。
- Spin to Soar! Master the Science of the DIY Gyro Plane
- Secret Mouths Hidden Beneath Leaves? Capture Stunning Stomata with Your Smartphone (Tradescantia Observation Guide)
- See the “Height” of Electricity!? Master Kirchhoff’s Laws in 3D (High School Physics)
- Master the Toughest Topic in Physics: Helical Motion! Break Free from the Textbook with 3D Graphs (Grapher & GeoGebra)
- Transform Your Lessons! Effortless & Crystal-Clear Mitosis Observation with Safranin Solution
- A Green Universe Under the Microscope! Discover Living Cells with Elodea
- The “Flower Memory” Hidden in an Apple’s Base. Are Strawberries and Apples Both “Imposters”? The Surprising Truth About What We Really Eat
- Step Into a Tiny Universe Under the Microscope! A Guide to Discovering “Living Works of Art” in Your Biotope
- Reveal the True Nature of Sound! Experience the Magic of Wave Science and Visualization with GeoGebra












