What is Periodus and what is its relationship to Lunara?

Periodus is an independent, actively developed hard fork of Lunara (an open-source local-first cycle tracking app). Periodus retains Lunara's robust local-first foundation while introducing a refined Terminal Modernist design system, fluid momentum touch physics, custom asynchronous in-app dialogs, and enhanced zero-knowledge cloud backup integrations.

How does Periodus guarantee zero-knowledge data privacy?

Periodus operates entirely on-device using local SQLite or IndexedDB storage. All data backups (manual file export, Google Drive appDataFolder, or Cloudflare Worker relay) are encrypted client-side with AES-256-GCM and PBKDF2/Argon2 key derivation before leaving your device. No analytics, tracking SDKs, or identifying telemetry exist in the app.

Can I use the AI companion without leaking my sensitive cycle logs?

Yes! The AI companion in Periodus is strictly Bring-Your-Own-Key (BYOK) with support for Anthropic Claude, OpenAI, or local on-device models like Ollama. Your API credentials reside securely in Android Keystore / iOS Keychain. Most importantly, you have granular per-message consent toggles allowing you to attach or withhold your tracker context for each specific question.

Does Periodus require a recurring paid subscription?

No. Commercial cycle tracking apps commonly charge $50–$80 per year and monetize user data. Periodus is free and open-source forever under the GNU Affero General Public License (AGPL-3.0).

Can Periodus track pregnancy, TTC (trying to conceive), or perimenopause?

Yes. Periodus supports multiple adaptive lifecycle modes including Menstrual Tracking (regular/irregular), Trying to Conceive (BBT temperature curve plotting, LH surge test logging, and fertile window calculation), Pregnancy Support (LMP, ultrasound EDD, milestones), and Perimenopause monitoring with clinical prompt exports.

AGPL-3.0 OPEN SOURCE 100% ZERO-KNOWLEDGE LOCAL-FIRST

Private, Local-First Cycle & Health Companion

Empowering reproductive autonomy through on-device computing, zero surveillance, AES-256-GCM encrypted vaults, and refined Terminal Modernist design. Hard-forked from Lunara.

Get Latest Release View on GitHub

LOCAL VAULT (AES-256) PERIODUS 1.0

Day 14 High Fertility

Ovulation Approaching

BBT TEMP

36.75 °C

CLOUD RELAY

Encrypted

UNCOMPROMISING AUTONOMY

Why Choose Periodus?

Comparing our local-first, zero-knowledge architecture against mainstream commercial period tracking apps.

Feature	Periodus	Mainstream Commercial Apps
Data Privacy	100% Zero-Knowledge & Local-First	Cloud-stored, monetized, or shared with data brokers
Subscription Paywalls	Free & Open Source Forever (AGPL-3.0)	$50–$80/year recurring subscription walls
Onboarding Experience	Fast, respectful & explainable	50+ intrusive question sales funnels
Cloud Backups	Client-side encrypted (AES-256-GCM)	Plaintext or server-accessible storage
UI Aesthetics	Terminal Modernist (High-contrast dark gold)	Generic pink pastels & ad banners
AI Assistant	Bring-your-own-key, per-message consent	Mandatory corporate cloud telemetry

BUILT FOR HEALTH AUTONOMY

Refined Engineering & Deep Capabilities

Engineered for longevity, privacy, and scientific rigor across every stage of your reproductive journey.

Terminal Modernist UI

Deep obsidian surfaces (`#16130b`), warm gold glowing typography, fluid momentum touch physics (`-webkit-overflow-scrolling: touch`), floating elevated cards, and safe-area padding.

Tactile In-App Dialogs

Adaptive Lifecycle Modes

Probabilistic estimation windows for both regular and irregular cycles. Seamlessly switch into TTC (Trying to Conceive), Pregnancy Milestone dating, or Perimenopause monitoring.

Multi-Mode Support

TTC & Ovulation Plotting

Log Basal Body Temperature (BBT), LH surge test strips, cervical mucus indicators, and ovulation estimations with precise interactive charts.

Conception & Fertility

Zero-Knowledge Encrypted Vaults

Export local encrypted snapshot vaults secured with AES-256-GCM. Connect private Google Drive `appDataFolder` or Cloudflare stateless zero-knowledge R2 worker relays.

Client-Side Cryptography

Private BYOK AI Companion

Bring your own API key for Anthropic Claude, OpenAI, or local custom endpoints (Ollama / LocalAI). Stored in hardware Android Keystore / iOS Keychain with strict per-message consent.

Hardware Keychain Isolation

Clinical Doctor Summaries

Export formatted medical summaries tailored specifically for healthcare consultations—providing vital cycle history and symptoms without exposing identifying telemetry.

Clean Consultation Export

LIVE INTERACTIVE DEMO

Terminal Modernist Cycle Estimator

Drag the slider to test how Periodus dynamically classifies cycle phases, fertility probabilities, and physiological indicators in real time.

CYCLE DAY Day 14

Estimated Phase Status

Ovulatory Window

High LH surge likelihood and fertile window peak. Core body temperature shifts follow ovulation.

Calculated 100% on-device

Honoring Lunara & Open-Source Lineage

Periodus is an independent, actively developed hard fork of Lunara. It inherits Lunara's robust local-first database models while introducing a bespoke Terminal Modernist dark gold design system, fluid momentum scroll physics, custom asynchronous dialog systems, and enhanced zero-knowledge cloud backup integrations. Licensed under GNU AGPL-3.0.

INDEPENDENT & AD-FREE

Support Independent Open-Source

Playpixelpro crafts free, private, and open-source software without venture capital, tracking ads, or monthly paywalls. If Periodus empowers your health autonomy, consider supporting ongoing development.

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ANSWERS & SPECS

Frequently Asked Questions

Everything you need to know about Periodus, data privacy, cryptographic vaults, and device support.

What is Periodus and how is it related to Lunara?

Periodus is an actively maintained open-source hard fork of Lunara. It builds upon Lunara's local-first foundation by introducing a high-contrast Terminal Modernist design system (`#16130b`, `#ffe1a3`), fluid momentum touch physics across all modals and calendars, tactile asynchronous dialogs (`useDialog`), and streamlined zero-knowledge cloud backup providers.

How does Zero-Knowledge AES-256-GCM encryption work in Periodus?

Your cycle logs and sensitive symptoms never leave your phone unencrypted. When performing backups (manual file export, Google Drive `appDataFolder`, or Cloudflare Worker relay), the payload is encrypted client-side using authenticated AES-256-GCM with PBKDF2/Argon2 key derivation. Neither Google nor server operators can read your medical data.

Is Periodus available on both Android and iOS?

Yes! Periodus is built with React 18 and Capacitor 8.4. It compiles to native Android (`com.playpixelpro.myperiod`) and native iOS packages, with support for native home screen cycle widgets and Apple Health / Health Connect read integrations on-demand.

How does the Bring-Your-Own-Key (BYOK) AI Companion work?

You supply your own API key for Anthropic Claude, OpenAI, or a local server (Ollama). Your secret key is stored exclusively in hardware keystores (Android Keystore / iOS Keychain). When asking questions, Periodus gives you granular checkboxes to decide if and what cycle details to attach to that specific prompt.

Are there any subscriptions, hidden fees, or ads?

Never. Periodus is 100% Free and Open Source Software (FOSS) released under the GNU Affero General Public License v3.0 (AGPL-3.0). All features—including BBT charting, symptom tracking, doctor summaries, and cloud sync—are completely unlocked forever.

PRIVACY CHARTER & TERMS

Privacy Policy & Terms of Use

Uncompromising data sovereignty, zero telemetry, client-side cryptographic vaults, and medical transparency.

100% Zero-Knowledge Privacy

Periodus has zero tracking SDKs, zero advertising pixels, zero analytics telemetry, and zero central servers. Playpixelpro cannot access, view, intercept, or monetize your reproductive health data.

Zero Telemetry & Tracking

Local-First Storage & AES-256-GCM

All period logs, symptoms, BBT temperatures, and fertility notes are stored strictly on-device in sandboxed SQLite or IndexedDB. Backup snapshots are encrypted client-side with AES-256-GCM before export.

Authenticated AES-256-GCM

Google Drive appDataFolder Isolation

Optional Google Drive sync writes exclusively into your private, restricted appDataFolder. Other apps cannot view it, and only your device holds the decryption passphrase.

Restricted AppData Sandbox

Bring-Your-Own-Key (BYOK) AI Consent

Connect Anthropic, OpenAI, or local Ollama endpoints. API keys reside in hardware Keystores / Keychains, and context is only shared with explicit per-message user opt-in.

Granular Per-Prompt Consent

Medical & Contraception Disclaimer

Periodus is an educational and personal health companion. It is NOT clinical medical advice or guaranteed contraception. Always consult healthcare professionals for clinical diagnosis.

Educational Companion

GNU AGPL-3.0 & Key Responsibility

100% Free and Open-Source Software. Hard-forked from Lunara. Because Periodus is zero-knowledge, Playpixelpro cannot recover lost passphrases—users maintain custody of their vault keys.