PeriLog · perimenopause. App page. Not yet on the App Store.
The whole product is one page you hand to a doctor who has ten minutes.
PeriLog is for a competent adult who is being dismissed, and its job is to hand her ammunition rather than encouragement. About twenty seconds a day: hot flushes, 3am waking, rage, joint pain, fog, bleeding. Ninety days later it prints what is below — ranked, dated, and charted against every change of dose. The daily card and the bleeding log are free forever.
01The page
SpecimenNobody's real record. Every figure below is invented to show the shape of the output, and the app would print it from your own entries with your own dates on it.
Symptom record · 90 days7 May — 4 Aug 2026
Ranked over ninety days
84 of 90 days logged. Mean severity on a 0–4 scale, counted only on days with an entry.
Hot flushes2.6 · 82 d
Waking at 3am2.4 · 74 d
Rage2.1 · 41 d
Joint pain1.8 · 63 d
Brain fog1.6 · 55 d
Night sweats1.3 · 38 d
What changed, and what moved
Date
Change logged
What moved
12 May
Patch, 50 → 75
Hot flushes 2.8 → 1.1 over the 14 days from 12 May
2 Jun
Evening dose moved 21:00 → 18:00
Waking at 3am 2.9 → 2.6 over 14 days; inside the day-to-day spread
17 Jun 26 Jun
Two changes, nine days apart
This window cannot separate them. Nothing is attributed to either.
Bleeding
Six episodes in ninety days. Shortest gap 19 days, longest 44. Two described as heavy, both in the last six weeks. No pattern is asserted and no cycle length is estimated.
Page 1 of 1xuranium.com/perilog
Ember is the symptom and Teal is the treatment, on this sheet and everywhere in the app. Because the two are fixed, the overlay chart in the app needs no legend at all — and no meaning is ever carried by colour alone: every severity shows its word and every series carries its label.
02The third row
The row that says this window cannot separate them is the whole reason I built this. Two things changed nine days apart. Something got better. Every app I looked at would have drawn a line to the nearer change, and every one would have been guessing.
ChangeImpactEngine refuses. It waits out the lag before it compares anything, it needs a minimum number of logged days on each side of a change, and when two changes overlap inside the same window it says so and attributes nothing. You get fewer conclusions than a worse app would give you, and the ones you get survive being questioned by a clinician who has seen a hundred apps that guess.
It also never claims causation. "Hot flushes fell from 2.8 to 1.1 over the fourteen days from 12 May" is a sentence about a measurement. "The patch is working" is a sentence about your body, and the app is not entitled to it.
03No predictions
PeriLog will not tell you when your next period is due. There is no fertile window, no cycle-length average, no calendar with a shaded band of days, and no assumption anywhere in the code that your cycles are regular. That assumption is exactly what stopped working, and it is the thing that makes every general-purpose cycle app useless at precisely the point you needed it.
What it does instead is describe. Six episodes, shortest gap 19 days, longest 44, two heavy — facts with dates, which is what a doctor can act on and what a prediction is not.
04Free and paid
Free, permanentlyThe daily card, the bleeding log, thirty days of history, the widget$0.00
PeriLog ProUnlimited history, the dose overlay, the pattern finder, the printable page$44.99 / yr$6.99 / mo
A 7-day free trial on both. No weekly plan, no ads in any tier, and the price, the renewal date and the route to cancelling are printed above the purchase button rather than below it. Apple sets the figure in your country.
Thirty days of history is a real amount of history, not a teaser. If you stop paying you keep everything you logged and you keep logging; the pack and the overlay are what stop.
05What it will not do
It will not diagnose or name a stage
No "you are in late perimenopause", no score, no interpretation of what your numbers mean about you. It does not diagnose, and it is not a medical device. Talk to a clinician about your health.
It will not touch your medication
It records the day a dose changed because you told it. It never suggests a change, never adjusts one, and has no opinion about what you should take.
It will not congratulate you or scold you
No streak celebration, no confetti, no emoji in the interface. Miss a day and it prints "6 of the last 7" and nothing more.
It is not pink
Heat is the literal subject. The palette is ember and warm grey, and the neutral ramp is warm rather than blue-grey because the deliverable is a printed page.
It has no account and no server
Your logs are on your iPhone and in your own iCloud. Nothing is sold, nothing is shared, and there is no backend for me to lose.