On another note, one also gets ThinkOrSwim, one of the better trading platforms with TDA, includes the ThinkBack (practice on any previous chart functions that were all recorded for exact previous market action), or just the straight app for trading with fake cash.
About the PPO which has been one of my main studies I've used for years now, in ToS there's a PriceOsc, but a script for a truer PercentagePriceOsc for ToS (might have to adjust script for a different platform) can be with whatever critiquing one might want
or link for "Open Shared Item" in ToS; https://tos.mx/hv8hVf (copy and paste into "Open Shared Item" under "Setup" on main workspace and then edit or add study PPO or whatever you named it)
Or a PPO version with divergence and pivot indicators share link; https://tos.mx/VmatfLU
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