Lumera — understand your cycle, not just your dates

Record · Estimate · Explanation

Recorded or estimated? Always know.

Most apps give you a date. Lumera also shows where it comes from: what you entered, what it calculated from that, and why.

RecordReal data you entered. An estimate never overwrites it.

EstimateCalculated from your records, with a stated confidence level. Always shown apart from them.

ExplanationWhich records, how many cycles and which rule the estimate rests on.

Estimated next period

Example

Your last 3 cycles: 28 · 30 · 29 days
Median: 29 days
Range: ±2 days, set by how much your cycles vary
Estimate certainty: Medium
Calculated: Only on your device

Illustration with sample numbers, not real data.

A real example

How was this calculated?

Open “How was this calculated?” on Today or Analysis and Lumera shows its working: the cycles it used, how much they vary and how sure it is. No black box.

Inside the app

Today, Calendar, Analysis

Three calm screens. Each one tells you what is a record and what is an estimate.

Today

Your cycle day, the next period as a range instead of a single date, and today’s entries in one place.

Calendar

Period, tests and symptoms in one view. Records are filled in, estimates use a dashed outline.

Analysis

Cycle length, BBT and your own patterns. No percentages, no scores, only a stated confidence level.

Period · LH tests · Pregnancy tests · BBT · Symptoms · Notes · Medication

PinkFree

Baby BlueWith Personal

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Why Lumera

Made to be understood

Not more screens or more scores. Just clear answers about your own data.

Explainable predictions

Every estimate comes with the records, cycles and rule behind it.

Records and estimates kept apart

You can always tell what you entered from what Lumera worked out.

Honest about certainty

Each estimate says how well it is supported: low, medium or higher. No percentages, no scores.

Same science on every plan

Free and paid plans run the same rules. Paid plans add depth, not better predictions.

Calm and focused

No feed, no articles to scroll, no ads. Just your cycle.

And also

An installable app that works offline, in English, German, Turkish and Brazilian Portuguese, with lifetime options.

Science and safety

Careful about what it can tell you

A positive LH test is a surge record, not a confirmed ovulation. A negative pregnancy test does not mean you are not pregnant. Lumera says so on screen.

Where a rule rests on a medical or scientific source, you can see the source. Product rules without a direct source are labeled separately.

Your health records are stored on your device, in your browser. They are not sent to analytics, advertising or AI services. If you sign in, the server holds only your email address and a hash of your password.

Not a diagnosisLumera records and estimates; it does not diagnose

Not contraceptionEstimates must not be used to prevent pregnancy

No fertility scoresNo percentages, only a stated confidence level

Plans

Start free. Go deeper if you want to.

Every plan uses the same science. Your records, history and predictions remain accessible on every plan; paid plans add depth, charts, reports, exports and themes.

Free

€0

Always free

Period, LH, pregnancy test, BBT, symptom, note and medication logging
Calendar, predictions and an explanation for each prediction
Analysis of your latest 3 completed cycles
JSON export and the pink theme

Start free

Personal Lifetime

€19.99

One-time payment, no expiry

Everything in Free
Analysis over your full history
BBT chart and personal observations
All themes (blue and dark)
CSV export and doctor summary

Personal Annual

€9.99/ year

Renews yearly, same features as Personal Lifetime

Everything in Free
Analysis over your full history
BBT chart and personal observations
All themes (blue and dark)
CSV export and doctor summary

Pro Lifetime

€39.99

One-time payment, no expiry

Everything in Personal
Advanced analysis and long-term views
Cycle comparison and range reports
Pro features are still in development

The paid plans cannot be bought yet. Free is available now.

Pay once, not every year

Personal Lifetime costs about as much as two years of Personal Annual. One payment, no expiry, no subscription to cancel.

FAQ

Good questions

Do I need an account?

Yes. Lumera needs a free account so you can sign in on your device. It gives you the Free plan right away, no card required. An account does not unlock paid features; your plan is separate. Your health records stay on your device.

Is Free really free?

Yes, and it stays free. Free is a complete product: you can log everything, use the calendar and predictions, and see the explanation behind each prediction. Paid plans add more history, charts, reports, exports and themes.

Do paid plans give better predictions?

No. Every plan runs the same science and the same rules. Paid plans only add depth and convenience.

Where are my records stored?

On your device, in your browser. They are not sent to analytics, advertising or AI services. If you sign in, the server holds only your email address and a hash of your password.

What happens if I change phones?

Your records live on the device where you entered them. On every plan you can export them as a JSON file and move them yourself. Syncing between devices is not available yet.

Is Lumera a diagnosis or contraception tool?

No. Lumera records and estimates; it does not diagnose, and its estimates must not be used to prevent pregnancy. If you are worried about your health, talk to a doctor.

Does it work offline?

Yes. Lumera is an installable web app. Once it has loaded, you can open it and log entries without a connection.

Understand your cycle, not just your dates.