What’s the most useful AI companion you’ve tried so far?

AI companions are quietly becoming a new category.

Not just chatbots — but tools people actually rely on every day.

Some help with coding.

Some help with productivity.

Some help with mental health or sleep.

Curious what people here are using.

What AI companion do you actually come back to daily?

Recently I’ve been exploring how AI can help people unwind before sleep.

We’re experimenting with this idea at SleepAI.com — an AI companion designed to help people slow their mind down at night.

Would love to hear what others are building or using.