App Overview

MC-Timer icon

MC-Timer

tredje design · Health & Fitness

MC-Timer plays music for timed intervals.

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
1.0
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.

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What's included15 files

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

  • START_HERE
  • AGENTS
  • EVIDENCE
  • SPEC
  • BUILD_PLAN
  • DIFFERENTIATION
  • skills/
  • screens/
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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.

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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for MC-Timer: 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.
            

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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

Introduce customizable workout routines and templates.

Assumption to check: Limited workout features compared to competitors

Validate with people who use this workflow before building.

Hypothesis 2

Focus on UX improvements and user feedback integration.

Assumption to check: Poor user reviews and experience

Validate with people who use this workflow before building.

Hypothesis 3

Add social sharing and challenges to engage users.

Assumption to check: Lack of social features

Validate with people who use this workflow before building.

Hypothesis 4

Integrate progress tracking and analytics for workouts.

Assumption to check: No progress tracking

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

MC-Timer plays music for timed intervals. You can use this app to have some fun during workout sessions like Tabata, intervals, HIIT, or circuit training, where you have multiple, timed sets of exercise and rest phases. For more complex routines, the names of your exercises can be shown and randomized, optionally also audibly announced. MC-Timer will guide you through your planned workout by playing music during the high-effort exercise phases and by being quiet during the pauses. No need to constantly look at your watch. Just listen to the music. Your music. When the work phases are shorter than the typical duration of a song, then you can nicely play a new song for each set. Let yourself be surprised and allow MC-Timer to play a randomly chosen song for each set. And if you do not want to listen to mellow song intros, you can set MC-Timer to play a suitably long section from the "heart" of the song. While the workout is playing, you can see your progress within each set and within the entire session by looking at the progress rings and the countdown timers. The progress rings are distinct and remain legible even from the other side of the room. To make this possible, the display will stay on while MC-Timer is playing your session. MC-Timer synchronizes the workout definitions across your devices. If you like to use a bigger screen, play the workouts using MC-Timer on iPad or Apple TV. The workout details are fully customizable. You can, but you don't have to: - define any number of repeated sets of "music" and "pause" phases; - insert special sets without music to create longer pauses; - define one or more lists of exercise names to be shown or announced; - choose all the songs that will be played; - use the playlist or exercise lists as is or randomized; - select whether you want to skip to the next song for each set; - play tracks from the beginning or from the middle. Alerts!!! - optionally, use countdown beeps or just a single warning beep; - pick a fun alert sound to play at the start or end of each music phase, or at the end of the session; - select from 62 custom sounds: bells, horns, special effects, Science Fiction and cute animals; A few geeky details: - Each set consists of a "music" phase and a "pause" phase, optionally repeated multiple times. - Music and pause times are entered in seconds. - The start delay (or the default 5-second countdown) is not counted for the workout duration. - A complete session always ends at its last music phase, i.e. the very last pause is skipped. - When you have multiple exercise lists, you can assign which list to use for which set. - You can define exercise pairs like "lunges, left/right" which can be split into "lunges, left" followed by "lunges, right". - You can enable or randomize lead phrases like "Next up: " for the voice announcements or define your own. - MC-Timer accurately times your workout; unlike other apps, there are no timing errors that accumulate as the session progresses. - The counters/timers in the playback view can be tapped to toggle between counting up or down. - The shuffle mode randomises the order in which the songs are played. That is to say: songs will not be repeated until all songs in the playlist have been played. - You can override the default system-wide appearance and always use the app in its dark or light appearance. Medical Advice Please consult with a physician prior to engaging in a new exercise program; even more so if this is not something that you are used to. MC-Timer on the Apple TV You can easily playback your workout sessions directly on Apple TV by using the MC-Timer companion app for Apple TV. However, you cannot edit the sessions there; you need to do that on your iPhone or iPad and sync your changes via iCloud. Also note that since your (iTunes) media library is not available on Apple TV, you will need an Apple Music subscription in order to play music on Apple TV.

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Screenshots

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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
React Navigation
React Native Reanimated
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.