App Overview

Yonks – Day Counter icon

Yonks – Day Counter

Stefan Grund · Productivity

Yonks is a day counter app for past and future events, you would like to remember.

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.4
19 ratings · Top 30%

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

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What's included16 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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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 Yonks – Day Counter: map the core Productivity 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

Allow users to customize colors and themes for each counter.

Assumption to check: Limited customization options for counters.

Validate with people who use this workflow before building.

Hypothesis 2

Integrate notifications to remind users of important dates.

Assumption to check: No reminders or notifications for events.

Validate with people who use this workflow before building.

Hypothesis 3

Enable users to share their counters with friends.

Assumption to check: Lack of social sharing features.

Validate with people who use this workflow before building.

Hypothesis 4

Implement cloud sync for users to access counters across devices.

Assumption to check: No cloud sync option.

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

Yonks is a day counter app for past and future events, you would like to remember. Ever wondered how many days have been passed since you were born or since you've been married? How many weeks are left until your next vacation starts or a project must be finished? Are you counting the days since you've started your diet, daily workout or quit smoking? How many hours until a highly anticipated movie opens or the new awesome video game will be released? Yonks (British slang for "a long time") helps you to keep track of all of these dates and their notable milestones. :) KEY FEATURES - Fully customizable counters: Choose between counting minutes, hours, days, weeks, months or years and select a custom emoji and color for every counter. - Milestones: See when a notable milestone occurs (e.g. "When is your 1000 day anniversary?") and add it to your calendar. - Sortable lists: Order your counters manually, alphabetically, increasing or decreasing by date or by color. - Notes: Need to remember more than just a date? No problem, just add a custom note to your counter. - Suggestions: No idea what to add? Yonks has a growing list of popular counters from a variety of categories (holidays, history, sports, movies, games, ...) for you to add with one tap. - Customizable date and time formats: Just change the date, time and number formats according to your personal preferences.

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

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
date-fns
@react-navigation/native
expo-notifications
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.