I found an app called “Lasting.” It is not by the Gottman Institute, but they say it is research tested strategies. I haven’t paid for the app, but by creating an account and doing the assessment it let me use their reminders. So multiple times a day, the app reminds me to check in with my hubby with fondness, affection, gratitude, etc. So far even without paying for the best of the content, this app is having a positive impact on my marriage. Check it out.