App Overview

MyDays X Pro icon

MyDays X Pro

Christian Mueller · Lifestyle

MyDays X - The Original Period & Ovulation Calendar to track your Cycle Days

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.8
42 ratings · Top 50%

Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.

Build your own version

Build Kit

Make this idea yours

A product spec, screen plans, and build steps for your coding agent.

First kit free with a verified email

Add to a Remix

Combine features and design from your favorite apps.

Kit ready. Verify your email to download it.

What's included18 files

A product spec, phased build plan, differentiation notes, and screen references.

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
Preview a sample Build Kit No email needed

Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.

Feature spec

Goal: Send a clear invoice after finishing a job.

  • Add a client, line items, a due date, and payment instructions.
  • Preview the total before exporting a PDF.
  • Keep an editable draft if export fails.

Screen plan

Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.

States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.

Differentiate and validate

Hypothesis: Contractors need faster repeat invoices more than more templates.

First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.

The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.

Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.

JavaScript is required to complete mailbox verification.

Free quick prompt For a smaller starting point

Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for MyDays X Pro: map the core Lifestyle workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
            

Preview ready. Verify your email to reveal and copy the full prompt.

JavaScript is required to complete mailbox verification. Return to this prompt preview.

Continue in Rork copies the full prompt to your clipboard first, then opens Rork in a new tab.

Continue in Rork >

Affiliate link: CloneChart may earn a commission at no extra cost

Opportunities

AI-GENERATED OPPORTUNITY HYPOTHESES

These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.

Hypothesis 1

Allow users to add custom symptoms and notes.

Assumption to check: Limited customization for cycle tracking.

Validate with people who use this workflow before building.

Hypothesis 2

Implement a more minimalistic design approach.

Assumption to check: User interface feels cluttered.

Validate with people who use this workflow before building.

Hypothesis 3

Add customizable notifications for users.

Assumption to check: Lack of reminders for logging entries.

Validate with people who use this workflow before building.

Hypothesis 4

Provide clear explanations of premium features and benefits.

Assumption to check: In-app purchase model can be confusing.

Validate with people who use this workflow before building.

App evidence

Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.

App Store description

MyDays X - The Original Period & Ovulation Calendar to track your Cycle Days -- I love it — Really! Congratulations! Out of 100,000+ apps, MyDays X has been selected by leading doctors as a top health app. Based on its medical accuracy, its utility in supporting health or healthy living goals, and usability, MyDays X has received the award from HealthTap AppRx Top Health and Medical Apps reports. *** MyDays X predicts your fertile days and your next periods *** • ""Intelligent Notifications"" based on your Location and Time • Great Community Chat to share your Experience with other Users • Pregnancy Mode • Track more than 20 Symptoms and remember your Breast Self examination • Optional manual entry of your Ovulation days and next period prediction • Track when you had sex (how often, protected/unprotected) • Keep an eye on your blood flow and mood. • embedded eMail support for your cycle History to your doctor • Backup/Restore via MyDays Cloud Backup, Email or WiFi MyDays X - Period & Ovulation Calendar is the simplest way to track your female data. • NuvaRing and any other birth Control based on Insert/Remove after x Days • Partneremail, email your Partner how u felt in the last days and whats coming next • Disable Daily Options, for example for kids or when you don't like to come pregnant Simpler, Better, More Features and the best Community • See the possible gender your baby may be • Track your Cervix position, openness, firmness & feeling • Track OPK Results (negative, fertile, peak/ovulation) • Visualize Moon-phases The new MyDays ROCKS! More innovative features than ever! • Password Lock for your Security • Add the actual cycle day to the calendar days • Disable the predictions for period or ovulation on the calendar • Filter what you like to see in your History List (eg. only Data from 2014) • Multi User (track yourself, your daughter or close friend) 
 • Create your own Calendar Themes! 
 • Add text notes - remember if you took your pill • Overwrite the predicted ovulation with your manual set day • Adjustable Luteal phase • Option to see old predictions 
 • Reset preferences and data should you lost overview • Rename Symptoms Fields for your Needs • Get an overview by Chart for your temperature (BMT) and weight measures • Choose the start day of the week • Cycle and Period Length can be calculated automatically • Unit Measures in Kg/Lbs/Stone Celsius/Fahrenheit 
 • More than 20 Languages ---------------------------------------- MyDays, the easy tracking & prediction calendar for your period, ovulation and fertility. -------- 
Remember: 
MyDays does pinpoint the 'high fertile' days. However, you can become pregnant also on other days! Usage is your own responsibility. For more Help & Hint, see Preferences -> About -> Visit MyDays - Homepage -------- * "MyDays X Pro" contains NO ADS, The FREE ad-supported version is available here: https://itunes.apple.com/us/app/my-days-x/id470179308

Written user reviews are not shown here. Check current App Store reviews >

Screenshots

< Scroll to see more >

Build scope

Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.

Define the first version

Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.

Set boundaries

Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.

Check the hard parts

Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.

SUGGESTED BUILD STACK
React Native
Expo
Zustand
TypeScript
@react-navigation/native
expo-calendar
BUILD KIT DIFFICULTY
Intermediate

From the Build Kit assessment.

A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.