Nocode suggestion ( free tier or open source) to build successive popups ?

[billmetangmo]

Hello,

Not sure if this is the best place to ask but I take my chance.
I created 3 successive popups with a next button using pendo.io nocode builder ( because I am null at UI):

But the tool will be to expensive for my use case because I just use 0.5% of the product.
I wanted to know if someone knows a nocode specific tool ( free tier or open source) that i can use to do it .
Knowing that my constraint is that it should be a just a snippet i have to inject in head of my product because it's the only part I can modify from the tool

Any help will be appreciated 🙏