You think in SPY levels — “I'm wrong if SPY breaks 739.” But a stop order actually triggers on the option's price, not SPY's. That mismatch usually forces a choice: a real, broker-resting stop on the option (but in premium terms that drift from your level), or a mental “watch SPY” stop (that depends on you being at the screen). NoVo refuses the trade-off.
How NoVo does it
You mark the SPY level where the idea is invalid. NoVo translates that level into an option-premium stop using the contract's delta — if a $2 adverse move in SPY invalidates the trade and the option's delta is ~0.40, that's roughly a $0.80 stop on the option — and places it as a real, broker-side order on the option, with a small cushion for spread noise. You reasoned in levels; the stop lives where it can actually execute.
Why broker-side matters
Because the stop rests at your broker, not only on NoVo's server, it's protecting you even if a connection drops. And because it's sized to your level rather than an arbitrary premium, it doesn't get knocked out by ordinary spread wiggle before SPY has actually done anything wrong.
The stop sits on the option, so it can fill. It's sized to your SPY level, so it means what you meant. You don't have to pick one.
The takeaway
You get the level-based logic you actually think in, executed as a broker-resting option stop — the two things that are painful to reconcile by hand. It's one piece of the broader exit ladder, and a good example of NoVo doing the fiddly translation work so your read can stay in plain SPY terms.