App Overview

21 Day Slimple - The Easy Fix! icon

21 Day Slimple - The Easy Fix!

Marc Balzarini · Health & Fitness

The 21 Day Slimple app is the simplest way to track your 21 Day program workouts, containers, and water

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
2.0
1 ratings · Below Average

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 included17 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 21 Day Slimple - The Easy Fix!: map the core Health & Fitness 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

Include social features like challenges and community support.

Assumption to check: Limited user engagement features, leading to low retention

Validate with people who use this workflow before building.

Hypothesis 2

Integrate with HealthKit and Google Fit for better data tracking.

Assumption to check: Lack of integration with health tracking devices

Validate with people who use this workflow before building.

Hypothesis 3

Add algorithms for personalized fitness plans based on user data.

Assumption to check: No personalized workout or meal recommendations

Validate with people who use this workflow before building.

Hypothesis 4

Focus on robust testing and bug fixes to improve app stability.

Assumption to check: Poor user ratings due to bugs and crashes

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

The 21 Day Slimple app is the simplest way to track your 21 Day program workouts, containers, and water. Fix it! Track it! Share it! *This app differs from the 21 Day tracking apps in that it allows you to control the when you move to the next day/workout* Why use this app? Simple, more bang for your buck! No other 21 Day app is simpler, gives you more features, more ways to track your progress, or better support! Not even the Official Beachbody app which launched a year after 21 Day Slimple! Beachbody is your community and these are your tools! Compare and contrast our features with the others. Highlights: - base 21 Day schedule - extreme 21 Day schedule - Switch between cycles! - Before and After measurement tracking (Photos soon) - Up-to-date Base and Vegan food list - Weight & Measurement reports and chart - why track it if you can't view it? Share your progress! - 0.25 portion increments (we all eat uniquely) - 2 meal plans. Yes two! Switch between them throughout your cycle. * Great for the Countdown Competition / boot camp diet or slowly changing your portions. - Add multiple workouts per day! - Reminders - Hydrate, Getup/Move, Time to Eat! - Grocery List - create a list right from the food lists. Container Tracking: - Don't just mark a container as used - know what meal it was used for! * Customize the meal names - Breakfast, Shake, Lunch... - 0.25 portion increments (we all eat uniquely) - Edit container portions anytime! and switch between 2 plans * Great for the Countdown Competition / boot camp diet or slowly changing your portions. Food List - Up to date food list or Vegan food list - eat clean and cleaner! * No more carrying around your book! Daily Weight Tracking - use LB or KG - View your progress with each entry. - Weight Report - generated and saved! Weight Progress Chart - See and share your progress as you move thru your cycle - View in LB or KG Measurements - Track how your body changes! - Before / After tracking, total, and share. - Measurement Reports show the change between each body part as well as total (in or cm) Water Tracker - We don't always drink using an 8 oz cup so why track that way? - Select between a myriad of water bottle sizes! - Edit H2O qty anytime! Reminders - Stay Active and Hydrated! - Set reminders throughout the day to drink water and get up n move. Reports - Why track it if you can't view it? - Cycle Measurement Reports (before / after comparison) - Cycle Weight Report (all 21 days in one PDF) Exercises - Add custom workouts to your day - Build your own 21 day program with your workouts! Cycle Manager: - At the end of your 21 day cycle just add another cycle. * You will not lose all your data in this app when you start a new cycle! * Reset current cycle without resetting the app! ************* QUICK QUESTIONS ************* * How do I move to Day 2? - The 21 Day Slimple app is a self-paced 21 day cycle-based app. To increment to the next scheduled day, simply click the Complete Day button. * Do I have to lose all my information to start another round? - Absolutely not! The 21 Day Slimple app includes a cycle manager. A cycle manager?! What does that mean Tone? It means that at the end of your 21 days you simply add another cycle and can track another 21 days. Permissions * * Storage and Notification permissions are needed for report/photo generation, and for reminder notifications * * #21DaySlimpleSP by The Modern Pen and Paper Company® Creating apps that save more than time! Designed, compiled, and proud to say, Made in U.S.A.

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 Navigation
Axios
Zustand
Expo
React Native
TypeScript
BUILD KIT DIFFICULTY
Starter

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.