Three Pedals or Four: How Many Feet-Actions Does Code Review Need?
Pedal Three and Pedal Four both put your feet to work on the actions you repeat most while reviewing an agent's output: accept and reject. The difference is one pedal and what it buys you, a fourth hands-free action on Pedal Four, versus a smaller, lower unit on Pedal Three. If your review loop is strictly accept/reject/talk, buy the three-pedal unit; if you've got a fourth repeated action, the fourth pedal earns its price.
What each pedal is actually doing
Both are wired USB foot switches that enumerate as a standard keyboard, so neither needs a driver just to work, plug it in and it sends keystrokes. Pedal Three carries three independently programmable pedals on a curved, non-slip steel base; the common mapping is accept, reject and a hold-to-talk key, which covers almost the entire loop of briefing an agent, waiting, and reviewing without your hands leaving the keyboard. Pedal Four adds a fourth pedal on a wider, flatter plate, sold explicitly with a fourth action in mind, accept, reject, run-tests and next-diff is the example the manufacturer gives. Each pedal on either unit can send a key, a modifier combination, a text string, or a mouse click, so the ceiling on what either device can do is the same; the difference is how many hands-free actions you get at once.
When three pedals is already enough
If your review loop really is just accept, reject and talk, the fourth pedal on Pedal Four is one you won't use. Pedal Three's base is also smaller and more curved, which matters if the footwell under your desk is already crowded. Reprogramming either pedal is easiest through the manufacturer's utility, and on Pedal Three that utility is Windows-first, the pedals themselves work fine on macOS and Linux with whatever they were last told to send, but if you're on a Mac and plan to reprogram often, do it once on a PC and leave it alone.
When the fourth pedal earns its keep
Pedal Four's driver lives on the device itself, so it works the moment you plug it in with nothing installed on the host, and the wider plate sits low enough that you can rest a foot between two pedals without triggering either, useful once you're managing four actions instead of two. It's also the pedal to buy if you do anything besides code review with your feet: the manufacturer lists OBS scene control and medical or industrial dictation as other common uses, and mapping the extra pedals to your own OBS hotkeys for scene, mute and record is one of the main reasons streamers buy the four-pedal version specifically.
The one thing that's true of both
Foot pedals cost what they cost partly because of import duty: both Pedal Three and Pedal Four fall under a much higher United States duty rate than a macropad pays. That's not a reason to avoid pedals, but it's the honest answer to why a mechanical switch on a plate costs this much, it isn't the switches.
Who should skip pedals entirely
If you review agent output a handful of times a session rather than continuously, neither pedal is worth the floor space. A pedal earns its keep when accept/reject is something you do hundreds of times a day and moving a hand to a keyboard's accept key, over and over, is the interruption you're trying to remove. If that's not your day, a keyboard shortcut costs nothing and takes up no floor space at all.
For the input half of the same loop, see how a quiet way to dictate to an agent compares, or browse the rest of our side-by-side comparisons. Setup notes for Pedal Three: Pedal Three for Claude Code.