Bring Fourier Analysis
to Life in Your Classroom
Free, browser-based tools that make abstract concepts click.
No installation, no student accounts, no cost.
Why Educators Choose Us
Tools that respect your time — and your students' attention.
Zero Friction
No downloads, no accounts, no IT requests. Students open a URL and start learning. Works on any device with a browser.
Built for Teaching
Every tool includes explanations, FAQs, and step-by-step breakdowns designed to complement your lectures.
100% Free Forever
No freemium tricks, no paywalls, no student data collection. Ad-supported so it stays free for everyone.
Tool Highlights for Your Course
Matched to the courses you teach — click any tool to try it now.
Signals & Systems
ECE 301, EE 120, and similar courses
- Fourier Visualizer
Watch epicycles reconstruct drawn shapes
- FFT Calculator
Explore how different waveforms decompose into frequencies
- Convolution Demo
Step-by-step animated convolution with kernel sliding
Digital Signal Processing
ECE 438, EE 264, and similar courses
- Spectrogram
Real-time STFT visualization from microphone or demo signals
- Filter Designer
Design FIR filters with windowed sinc, see frequency/impulse response
- Signal Generator
Build multi-component signals, play audio, export WAV
Engineering Math / Physics
Math methods, wave physics, and intro courses
- Fourier Visualizer
The "aha moment" for Fourier series — see it, believe it
- FFT Calculator
Connect theory to computation with live spectrum plots
How to Use in Your Course
Four ways to integrate fourier.tools — pick one or all.
Share a Link
Post fourier.tools on your LMS or syllabus. No setup needed — students click and go.
Assign Explorations
"Use the FFT Calculator to compare the spectrum of a sine vs. square wave. What harmonics do you see?"
Live Demos
Project the Visualizer in class. Draw a shape, watch it get rebuilt by spinning circles. Instant engagement.
Embed in Materials
Every tool has shareable URLs. Drop links into your course notes, slides, or website.
Ready-to-Use Assignment Ideas
Copy these prompts straight into your problem sets or lab handouts.
"Use the Convolution Demo to convolve a rect pulse with a Gaussian kernel. Describe what happens and why."
"Open the Spectrogram with your microphone. Record yourself saying "aaah" and "ssss". Compare the spectrograms and explain the difference."
"In the FFT Calculator, set the signal to square wave at 5 Hz with 1024 samples. List the first 5 harmonic frequencies and their relative amplitudes."
"Use the Filter Designer to create a lowpass FIR filter at 500 Hz. What happens to a chirp signal when you apply it?"
"Draw your initials in the Fourier Visualizer. How many harmonics does it take to make them recognizable? Screenshot at 5, 20, and 100 harmonics."
"Fourier Tools is a Bodhin Industries project. We'd love your feedback — if you use fourier.tools in your course, let us know and we'll add features you need."
Reach us at help@fouriertools.com
Questions? Suggestions? Feature Requests?
Email us at help@fouriertools.com
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