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.
App Overview
Bullet Journal Companion
The Bullet Journal® Companion 2.0 is designed from the ground up to help you get the most out of your BuJo® practice and your notebook
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
1,999 ratings · Top 15%
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/
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.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Bullet Journal Companion: 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 templates and layouts.
Assumption to check: Limited customization options for collections and journal entries.
Validate with people who use this workflow before building.
Hypothesis 2
Implement push notifications for due tasks.
Assumption to check: No reminder notifications for tasks.
Validate with people who use this workflow before building.
Hypothesis 3
Provide analytics on user productivity and task completion rates.
Assumption to check: Lack of analytics or insights on task completion.
Validate with people who use this workflow before building.
Hypothesis 4
Add features for sharing collections with friends or team members.
Assumption to check: No collaboration features.
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 Bullet Journal® Companion 2.0 is designed from the ground up to help you get the most out of your BuJo® practice and your notebook. Version two is packed with the most requested features by the community. FEATURES: • The Log - Quickly capture Tasks, Events, and Notes when away from your notebook. • Library - Backup and Tag and search all your notebooks. • Guide - Learn the how to Bullet Journal®. • Reflection - Help form the powerful habit of reflection. • Articles - Get inspired by the global community. • Monthly prompts - Make sure you're prepared each month. • Designed by Ryder Carroll, creator of the Bullet Journal® system. NEW in version 2.5: - Improved menu and interface - Home screen now features daily journaling prompts and quotes - New collection of widgets to log or reflect - "Learn" section features a lot of new content - "Guide" features new tutorials - A LOT of bug fixes and optimizations NEW in version 2.0: • Take pictures of all your pages. • Back up your Bullet Journals to your Files app. • Restore old notebooks on new devices. • View reflections from months past. • Redesigned reminders notifications. • Log items expire after 72 hours. • New views to organize your entire library of Bullet Journals. • Now faster and more responsive. • Numerous optimizations and bug fixes. NOTE: This app is NOT designed to replace your notebook. It is a companion FOR your notebook.
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
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Zustand
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.
