[buy product=”lunalog”]
an offline period tracker that’s also your planner and journal.
LunaLog is a private cycle tracking app for people who want their cycle off the cloud. it tracks your period, plans your weeks, keeps a journal you can print, and holds your logins in a private vault — all on your own device. no account, no sync. the desktop app runs on Windows, macOS and Linux and is sold direct from this site; the price and whether the checkout is open are at the top of this page. a phone version for iPhone and Android is a separate product and is not in the stores yet.
what it does
calendar and planner
one calendar for your cycle, your appointments, and your notes. log periods and plan around them in the same place, with US and Irish public holidays and your saved birthdays already on the grid.
cycle & ovulation predictions with a window
each prediction shows a most-likely date, a confidence window around it, your predicted ovulation and fertile days, and a label for how regular your cycle has been — with phase shading forecast up to a year ahead. it reads your logged history instead of guessing a single exact day.
mood tracking & trends
log how you feel each day with a click, then see it charted against your period and cycle phases — a simple way to spot the patterns over a month or a year.
journal with scrapbook photos
write entries, add photos, and keep a scrapbook of your year — with a fullscreen, distraction-free writing mode. export the whole thing to PDF, EPUB, or DOCX, or print a run of months as a PDF calendar on Letter, A4, or A5.
weekly & monthly to-do lists
a This Week and This Month checklist beside your calendar — tick things off as the month goes. each week and month keeps its own list.
notes
a place for the things that don’t belong on a date. quick notes that stay searchable and private.
import the periods you already know
type in your past start dates and lengths, as many as you can remember, and the predictions are built on your own history from the first day instead of on a blank month. nothing to move over from another app but the dates themselves.
search the whole calendar at once
one box across your journal entries, notes and appointments, holidays, and full moons, with a filter if you want to narrow it — so you don’t have to remember which part of the app you put it in.
address book
keep contacts and birthdays in one list. birthdays show up on the calendar automatically.
moon & sky log
moon phases from the Jean Meeus algorithm, plus supermoons, eclipses to 2029, meteor showers, and notable asteroid approaches — all on the calendar next to your cycle. when the eclipse table runs out it says so, rather than showing you a year with none in it.
doctor’s cycle report
one printable PDF with your average cycle and period length, your shortest and longest cycles, regularity, and symptom frequency — built on your device, ready to bring to an appointment.
reminders & notifications
optional alerts before your predicted period and ovulation, full-moon nudges, and custom repeating reminders with your own sound — all local.
private logins vault
store website logins and passwords in a searchable, password-masked vault with a built-in strong-password generator — kept on your device, never uploaded. the mask hides them on screen and the PIN keeps the app closed; neither one is encryption. if you want the files themselves protected, use your operating system’s disk encryption.
pregnancy mode & intimacy
a full pregnancy mode for when you need it, plus optional intimacy tracking — all private, all on your machine.
flow & symptom logging
log flow from spotting to heavy and tag the day’s symptoms — cramps, headache, bloating, mood, and more — charted right alongside your cycle.
themes, fonts, and a PIN lock
8 themes, 32 publish-safe fonts for your exports, a custom notification sound, and a PIN lock that keeps the app closed.
who it’s for
you want your cycle data on your own machine, not on someone’s server. no account to make, nothing synced anywhere.
you schedule work, travel, and rest around where you are in your cycle, and want it on the same calendar as the rest of your life.
you write entries and add photos through the year, then export it as a PDF, EPUB, or DOCX you can print or keep.
what sets it apart
what stays on your computer
LunaLog works offline. there’s no account to create and nothing leaves your computer. your cycle history, journal, and contacts live as plain files you can back up, move, or delete yourself.
the app keeps a daily local backup so you can go back if something gets deleted by mistake, and a PIN lock keeps the app closed to others — it is a door, not a safe: it does not encrypt the files. your data stays yours, on your machine — however you pay, nothing about your cycle is tied to a server or an account.
and there are no LunaLog servers. an app can only hand over, leak, or lose what it has — this one has nothing. the privacy page says the same thing in full.
more: a period tracker for your PC · can period-tracker data be subpoenaed?
desktop and phone are two apps
there is a LunaLog for computers and a LunaLog for phones. they are two products with two prices, sold in two different shops, and each is paid for once. buying either does not include the other.
system requirements
questions before you buy? email hello@cosmicore.net. the full user guide is inside the download.
[appstores product=”lunalog”]
common questions
does LunaLog work offline?
yes. it runs fully offline and never needs a connection. your cycle, journal, and contacts stay on your device as plain files.
do i need an account to use it?
no. there’s no account and no sign-up. you download it once and it runs on your machine, with nothing synced to a server.
is my health data private?
yes. nothing leaves your device. your cycle history and journal are stored as local files you control, and a PIN lock keeps the app closed to others. there are no LunaLog servers to breach or subpoena — the app can only hand over what it has, and it has nothing.
there are free private trackers — why pay for this?
the free ones are good, and minimal by design. LunaLog is the full desk: the cycle calendar plus a real journal, a planner, the mood graph, scrapbook photos, and book-quality export — an app you buy once and own. if a free tracker covers you, use it; this is for keeping everything in one private place.
what platforms does it run on?
the desktop app runs on Windows, macOS, and Linux, and one purchase covers all three. a phone version for iPhone and Android is a separate product with its own price in each store, and it is not in either store yet.
does buying the desktop app include the phone app?
no. they are two products in two different shops — the desktop app here, the phone version in the App Store or Google Play when it gets there. each is paid for once, on its own.
why will the Android app cost less than the iPhone one?
the two stores price differently, and Android prices sit lower across the board. it is the same app; the number follows the shop, not a sale.
who am i buying from?
the desktop app is sold by Paddle as merchant of record — Paddle is the legal seller, collects the tax, and handles refunds under its buyer terms. a phone app, once there is one, is sold by the store you bought it in, under that store’s rules. the refund policy spells it out.
is LunaLog a one-time purchase?
yes, on every platform — the desktop app is bought once, and the phone versions will each be bought once in their own store. no subscription, no in-app purchases, no ads, and nothing synced to a server.
can i export my journal as a book?
yes. you can export your journal, photos included, to PDF, EPUB, or DOCX, ready to print or keep as a book file — PDF and EPUB embed the fonts so they look the same anywhere, and DOCX uses your chosen font by name.
can i try it first?
there is no trial build. what there is instead: this page lists every feature, the full user guide is inside the download, and refunds are Paddle’s to decide under the buyer terms it sells under. if something here is unclear before you buy, email hello@cosmicore.net.
what happens to my app if Cosmicore stops?
the copy you downloaded keeps running. it needs no server, no account, and no licence check, so there is nothing that can be switched off at this end. your files are plain files on your own disk and stay readable without the app.
what does the licence let me do?
install it on the computers you own, use it for personal and commercial work, and keep the version you bought. there is no key and no activation. the plain-english version is on the licence page.
also here: Novelisha, the offline novel writing app — a separate one-time purchase.