Subject Line Tester: Analyze or Score Subject Lines Based on HubSpot Data

RacheleCom

CoSchedule and possibly some other marketing tools out there provide tools where you can put in your subject line and get feedback based on what they see working well, e.g. certain words, numbers, emoji, etc. may increase or decrease the chances the email will be opened, and based on those things they can give your subject line a score. Can HubSpot add this, primarily for marketing emails but potentially for one-off CRM emails too?