Hi, I’m using an app called Little Ones; used it with my now toddler as well as with my little baby. They also have consultants available to answer queries. I find their schedule and trouble shooting notes very helpful. You do pay but in my opinion it’s worth it and it adapts the schedule for your baby for their age etc
I know someone who used one: they found it helpful, but they also felt pressured to use the sleep schedule they made as they had paid for it. It made them really plan their days around sleep, which in the long run didn't work out. They also said they wouldn't do that again as it was costly, but it did help with a child who really hated sleep
I’ve had friends who have and really found them useful! https://www.instagram.com/calmandbrightsleepsupport?igsh=MW9hZ3hpeWY5eWJsaA==