What is your "Let me test this new idea!" stack?

All,
How do you test out a new idea?
I used to spend days building the MVP but now I try out first with a landing page.

Here's my stack:

Carrd.co - Create the landing page. ($20/year?
Mailerlite - Capture email signups (Free)

Facebook Ads or post on twitter to gain leads.

Do you build an MVP? Do you code it? or NoCode? What are the tools?