Tide — Your body speaks in tides. Learn to listen.

Why Tide

Every cycle tells a story. Tide helps you hear it.

Tide was built on a simple belief: information about your body belongs to you, and only you. That principle shapes every decision in the app.

Private by design

Your data lives on your device first. Nothing is sold, ever, and there is no advertising of any kind inside Tide.

For every body

Tide speaks to you and your body — never assumptions about who you are. The language stays human throughout.

Free, with no catch

Tide launches completely free. No paywall, no locked features, no subscription required to understand your own cycle.

The rhythm

A cycle is a tide. So we built it that way.

Numbers and charts can feel clinical. Tide translates the phases of your cycle into something intuitive — the turning of seasons, the rise and fall of water.

Winter

Low tide

The quiet, inward phase. Rest is the work.

Spring

Rising tide

Energy returns. The water comes back in.

Summer

High tide

The fullest, most outward stretch of the cycle.

Autumn

Falling tide

Winding down. The water draws back out.

Our promises

The things Tide will never do.

We will never sell your data

Not to advertisers, not to data brokers, not to anyone. Your cycle is not a product.

We will never show you ads

There is no ad SDK in Tide. Opening the app will never mean being sold to.

We will never gate what was free

Anything free at launch stays free. We don't take things away later.

We will never assume who you are

Tide is for anyone with a cycle. The language reflects that, always.

Our story

How Tide came to be

I've had super heavy periods since I was young. A few years ago I was diagnosed with submucosal endometrial polyps — not large enough for surgery, but enough to make things relentless. Pads every one or two hours, sleeping on towels, period underwear day and night, spare pants in every bag, and slowly running my iron down until I was anemic and exhausted.

The hardest part was something smaller and more constant: I'd lose track of time, think “just thirty more minutes is fine,” and then it would leak right away. I lost count of the embarrassing moments that cost me. So I built Tide for that — a gentle reminder to change before the moment turns into another story I'd rather not tell.

If your body works like mine, you're not alone here.

— Annie, founder of Tide