Custos creates emails in seconds that match the context of your conversations and sound just like you directly from your inbox. You never have to start from scratch again.
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Custos Launches
CustosPersonalized email drafts in seconds from your inbox
Launched on August 13th, 2025
Do you use Custos?
Maker Comment
Maker
📌
Hi Product Hunt 👋
I’m Khalil, one of the founders of Custos.
We built Custos because we were spending way too much time writing emails that should have taken seconds. Drafting, rewording, overthinking all added up to hours lost every week.
Custos helps you reply faster by automatically drafting emails in two ways: it pre-generates responses the moment an email hits your inbox and it instantly writes replies when you hit respond. You don’t need to change how you work. Custos works directly from your Gmail inbox through a Chrome extension and API combination. Your emails stay natural, contextual, and sound just like you.
If you’re curious, we’d love for you to give it a try and share any feedback, questions, or ideas. People from companies like dLocal, Tabby, Puzzle, Antler and Web Summit are already using Custos and helping us make it better every day.
Hi Product Hunt 👋
I’m Khalil, one of the founders of Custos.
We built Custos because we were spending way too much time writing emails that should have taken seconds. Drafting, rewording, overthinking all added up to hours lost every week.
Custos helps you reply faster by automatically drafting emails in two ways: it pre-generates responses the moment an email hits your inbox and it instantly writes replies when you hit respond. You don’t need to change how you work. Custos works directly from your Gmail inbox through a Chrome extension and API combination. Your emails stay natural, contextual, and sound just like you.
If you’re curious, we’d love for you to give it a try and share any feedback, questions, or ideas. People from companies like dLocal, Tabby, Puzzle, Antler and Web Summit are already using Custos and helping us make it better every day.
Visit our website and try Custos for free at https://www.withcustos.com/