Yes, Promptly Journals appears to be a legitimate company. They have received positive reviews from customers on Amazon, with a high percentage of 5-star ratings. Customers have praised the quality of the journals, their design, and the helpfulness of the prompts. Some customers have even mentioned that they would grab their Promptly Journals first in case of a fire. The company also has an average star rating of 4.8. However, it's always a good idea to do your own research and read reviews before making a purchase.