A Free Syntorial Alternative in Your Browser

Syntorial is the standard answer to "how do I learn synthesis," and it's good. It's also $129.99 for the full version, $189.99 for Pro, and it wants a desktop install. If you're looking for a Syntorial alternative because you'd rather find out whether you enjoy this before spending that, Synth Academy is free, opens in a browser tab, and teaches the same way: by ear, on a real synth, with challenges that score what you played.

I built it, and I want to be upfront about scale before you read further. Syntorial 2 ships 199 lessons, 145 challenges and 700-odd patches. Synth Academy has 13 challenges and a tutor that explains every control. It is not as deep. It is free and it starts in four seconds.

What "learn by ear" means here

The synth on screen is a real one. Two oscillators with four waveforms each, a sub, a noise source, true two-operator FM where B modulates A's frequency, glide, drive, a multimode filter with its own envelope, an amp envelope, and an LFO you can route. Nothing is a picture of a synth. Turn a knob and you hear it.

A challenge plays a target sound made on that exact synth. You rebuild it. Hit Check and it scores your patch and tells you which knobs are off and in which direction, which is the part that actually teaches, because "your cutoff is too high" lands differently than "try again." Pass mark is 85%.

The oscilloscope is the difference

Most synth tutorials describe a sawtooth wave. This one draws it, live, while you play, on a trigger-stabilized scope with a spectrum analyser under it. Open the filter and watch the harmonics come back. Turn resonance up and watch the bump appear at the cutoff. Add FM and watch a clean sine turn into something bristling.

That connection between what you hear and what the wave is doing is the thing that made synthesis click for me, years after I'd read the definitions. Ableton's Learning Synths is free and lovely and does some of this, but it stops before scored ear challenges, and it doesn't let you take the synth off the rails.

The tutor box

Hover anything and a box explains what that control does in plain English. Not the manual definition, the practical one: what it changes, what it's for, what happens if you push it too far. There's a signal path summary in the corner as well (osc A plus B plus sub plus noise, into drive, into filter with its envelope, into the amp envelope, out) which is the single most useful sentence in synthesis and almost nobody prints it where you can see it.

Progress saves to your browser, so you can leave mid-challenge and come back. No account required for that, though a free account is worth having anyway since it unlocks the full editors.

Honest comparison

• Depth: Syntorial wins, comfortably. 199 structured lessons with video against 13 challenges and a hover tutor. If you want to be walked from nothing to competent in a defined order, that's worth $129.
• Cost and friction: Synth Academy wins. Free, no install, no account, works on any machine with a browser. Students and teachers can get Syntorial at 40% off with an edu address, which narrows the gap if that's you.
• Transferability: roughly even. Both teach a generic subtractive synth, so what you learn moves to Serum, Vital, Massive or hardware. Syntorial has dedicated courses for specific synths; we don't.
• What you do next: this is where I'd argue for us. When you finish a challenge, the same synth engine is sitting in SoundCraft, our free browser DAW, on a real timeline with a piano roll and 15 effects. You go from learning to making without buying anything.

Who should buy Syntorial anyway

If you've tried and bounced off synthesis more than once, the structure is worth paying for, and I'd tell you to buy it. Syntorial's pacing is genuinely well designed and 145 challenges will take you further than 13.

If you're curious, or broke, or on a machine you can't install software on, start free. Do the 13 challenges, then make an account and take the same synth into a real project. If you finish them wanting more, you'll know the $129 is money well spent, and you'll get more out of it for having warmed up. Our longer synthesis walkthrough covers the theory side, and the free online synthesizer post looks at the instrument itself.