Period tracking apps have a trust problem. Major apps have been caught sharing data with third parties, selling information to advertisers, and storing sensitive health data on servers you don’t control. In a post-Roe world, many people have valid concerns about who can access their cycle data.

LastDid offers a radically simple alternative.

No accounts. No cloud. No data collection.

LastDid stores everything on your device and only on your device. There are no user accounts, no cloud sync, no analytics, no third-party SDKs. The app makes zero network requests for its core functionality. Your cycle data physically cannot be accessed by anyone but you because it never leaves your phone.

This isn’t a privacy policy promise. It’s an architectural fact.

What you can track

Some people use a single task. Others create a few:

• Period — Track cycle start dates
• PMS — Notice patterns in premenstrual symptoms
• Cramps — Log when they happen, see if there’s a pattern
• Migraine — Track cycle-related headaches

Each one gives you a simple, private record with average intervals and a full history. Track all four and you’ll start to see how they relate — maybe your migraines consistently show up two days before your period, or cramps cluster on the same weeks as PMS. The heatmap comparison view lets you overlay multiple tasks on the same calendar so the patterns are obvious at a glance.

What LastDid doesn’t do

Let’s be clear about what this isn’t. LastDid is not a fertility tracker. It doesn’t predict ovulation. It doesn’t have a “fertile window” feature. It doesn’t calculate anything about your reproductive health.

It’s a simple log of when things happened, with pattern awareness built in. For many people, that’s exactly enough.

Why simple matters

Dedicated period tracking apps often collect far more data than necessary — mood, symptoms, sexual activity, medications, weight. Each data point is another piece of sensitive information sitting on someone else’s server. This is part of why LastDid isn’t a todo app — it’s a deliberately minimal log, not a data-collection product.

LastDid asks for nothing except a tap when you want to log something. No surveys, no symptom questionnaires, no daily check-ins. Just a timestamp, on your device, under your control.

Export on your terms

If you want to share your cycle data with a doctor, you can export your LastDid data as a JSON file and share it however you choose. But that’s an active decision you make each time — not a background sync happening without your knowledge.

The privacy you deserve

Health data is some of the most sensitive information that exists. You shouldn’t have to create an account, agree to a lengthy privacy policy, or trust a company’s promises just to track your cycle. With LastDid, you don’t.