OKRs vs KPIs
Key Performance Indicators (KPIs) are used by most companies for performance management. Many people wonder what the difference is between KPIs and OKRs. In brief terms, KPIs measure the current state of the business, while OKRs tell us where we want to be. In other words, KPIs and OKRs are fully compatible - they're not competing concepts. Having KPIs is great since it means you can refer to them in your OKRs.
Having said that, KPIs are not a requirement before getting started with OKRs. When creating key results, you'll implicitly create KPIs since you need a way to measure progress.
So if you're concerned that you won't be able to use OKRs because you already have KPIs, do not worry! Having KPIs is most likely a benefit when starting with OKRs, since you'll get a head start when defining key results.