Research-based review — not personally tested
Fulltone OCD
Rating: 4.5 / 5
A more amp-like, dynamic overdrive that goes from edge-of-breakup to genuinely heavy. Reacts to your picking and your volume knob like a real amp.

Photo by ArtBrom from Seattle on Wikimedia Commons
Where to buy — around $129
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Pros
- Wide, dynamic gain range
- Cleans up from the volume knob
- Amp-like, full-range voice
- HP/LP switch for amp matching
Cons
- Brighter than some like
- More expensive than a Boss
- Lots of versions can confuse buyers
The amp-in-a-box
Where the Tube Screamer is mid-focused, the OCD is more open and full-range, with a wide gain sweep and a HP/LP switch that adapts it to different amps. It cleans up superbly from your guitar volume, which makes it a "set and control with your hands" pedal for players who hate tap-dancing.
Where to buy: Check the current price of the Fulltone OCD on Amazon →