DynaPictures - Design automation tool which lets you dynamically generate images over REST API. Change colors, texts, logos and images on the fly. Free plan includes 30 generated images per month and 3 image templates. - Source: dev.to / over 1 year ago

In this article, we shared some image auto-generation ideas and a brief guide on how to use the image generation software. - Source: dev.to / almost 2 years ago

Image generation software like DynaPictures can be used via API to generate images on the fly. You still need to create image templates for the designs that you want to automate, but you don’t need to write code for that. You use a Canva-like editor to create your design, and then just send REST API requests to replace different parts in the design and generate a final image. - Source: dev.to / almost 2 years ago

Here is my product: https://matchkraft.com/. It is a marketing toolkit. I think you need to ask for feedback, asking why users don't want to pay for a premium subscription. So far, you are getting new users that is a good sign you are going to the right direction. Maybe, who is your ideal customer or maybe your product is ok but need more visibility (maybe paying ads). Try to get active users. I really want to... Source: 12 months ago

Calling a 3rd party API: There is a complete ecosystem providing "google-sheets-as-DB". I personally tested and recommend https://sheetson.com/ but there are a lot more with free tiers https://sheetsu.com/ https://sheety.co/. Source: about 2 years ago