Google keeps it simple with two paths. The free version handles your basic...

https://juliet-wiki.win/index.php/Does_Gemini_Include_Integrations_and_Are_They_Paywalled%3F_The_Truth_Behind_the_Tiers

Google keeps it simple with two paths. The free version handles your basic brainstorming and daily writing tasks. If you need serious power, the $19.99 per month AI Premium plan integrates directly into Docs and Gmail