The fields parts can probably be done with any plugin, but for the custom emails and the emails conditional logic, I think you'll need to get a premuim copy of one of the popular form builders. If you would like to use a free option, I suggest Mega Forms, it supports all the fields you need ( checkbox, radio, textbox, pdf/file upload..etc ). Additionally, it allows you to customize the email and set some... Source: about 2 years ago

You can use any forms builder available for WordPress. However, I suggest using Mega Forms since I'll be sharing a code snippet below that can only work with it. Source: over 3 years ago

I've built Mega Forms, it's an advanced forms builder with lots of action and filter hooks that can be used to extend it to do anything basically. If you can explain what you need exactly, I can write a small snippet to generate the XML file for you. Source: over 3 years ago

For a form with notifications, you should either develop this with PHP and HTML or use an existing plugin ( you'll need to build the logic, markup, security ..etc ). If you want to go with a plugin I suggest Mega Forms, it allows you to create forms, send notifications, create conditional rules and also has AJAX submission (Disclaimer: I'm the developer). Source: over 3 years ago

Even Strapi needs to be hosted somewhere, and that usually involves a recurring fee. I've had great success over the past 2 years building blogs using http://webiny.com, and because they get low traffic, I've only ever had 1 bill from AWS that was around 80 cents US. Source: about 3 years ago

Strapi is awesome, I've been a fan of the project since its early days. However, I've been closely watching Webiny too. It's easier to host because you don't have to worry about running Docker containers or installing MongoDB on your local machine. Instead you put it on your AWS account (can be done with a few clicks), define your content models once it's there and you then only pay for usage. http://webiny.com. Source: over 3 years ago

Yeah I hear you, SAAS CMS platforms can get prohibitively expensive really quickly after the initial free tier expires. I've found hosting Strapi (or similar) on Heroku has saved me the cost of keeping a server instance running, which usually would cost $5-10 per month. However, the most cost effective for me so far has been Webiny. It's serverless so you install it on AWS and typically don't pay as much (if... Source: over 3 years ago

Otherwise if you want a framework to build on, there's Redwood (which works particularly well on Netlify and Vercel) or Webiny (for AWS, Azure and others). - Source: dev.to / about 4 years ago