App Overview

PaperCal icon

PaperCal

Johan Burgler · Productivity

A paper calendar

$3.99 · In-app purchases

PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
4.8
423 ratings · Top 5%

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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Build Kit

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

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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/
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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 PaperCal: 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

Offer more personalized themes and layouts.

Assumption to check: Limited customization options for calendar views.

Validate with people who use this workflow before building.

Hypothesis 2

Implement better task grouping and sorting features.

Assumption to check: Task management can feel overwhelming with many tasks.

Validate with people who use this workflow before building.

Hypothesis 3

Add calendar sync features with popular services.

Assumption to check: Lack of integration with other calendar apps.

Validate with people who use this workflow before building.

Hypothesis 4

Integrate reminders and notifications for events/tasks.

Assumption to check: No reminders for events/tasks.

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

A paper calendar. Reimagined for iPhone. Simple, clear, and easy to use. With beautiful widgets for your Home and Lock Screen. ▶ Why PaperCal? ◀ • See your schedule at a glance with clean, paper-inspired layouts • See tasks and events together in one view • Easy-to-read widgets for your Home and Lock Screen • Customize your calendar with 20+ beautifully designed themes • No clutter, no learning curve ▶ Calendar Views ◀ Switch between yearly, monthly, weekly, and daily views. Flip through pages like a real paper calendar. A clean, distraction-free interface. ▶ Tasks & Events in One Place ◀ No need for multiple apps. • Manage tasks and events in one place • Add and organize activities instantly • Sync with your existing calendars • Stay up to date across all your devices ▶ Make It Yours ◀ Choose from 20+ unique themes designed by illustrator Jojo Falk. • Add color tags to events and tasks • Quickly search your schedule • View week numbers and day counts ▶ Built for iPhone (and more) ◀ • Home Screen & Lock Screen widgets • Works on iPhone, iPad, Apple Watch, and Mac (Apple silicon) • One purchase, available on all devices ▶ Loved by Users ◀ “I love its simplicity and reliability.” “This calendar is great — I can see my whole week at a glance.” “I love this calendar because I can use it like a planner.” Rated 4.7+ by users worldwide. ▶ A Fresh Start ◀ PaperCal is the successor to “Week Agenda Ultimate”. Rebuilt from scratch based on years of feedback — now faster, clearer, and more refined. Start using PaperCal today.

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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
expo-calendar
react-native-paper
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.