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
MPP Viewer
Open .mpp files (created in Microsoft Project) directly on your iPhone, iPad, or Mac — no subscription, no cloud, no Microsoft Project required.
$14.99 · In-app purchases
PRICE
$14.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
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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 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.
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 MPP Viewer: 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
Enhance with more features like task prioritization and collaboration tools.
Assumption to check: Limited project management features compared to desktop applications
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly file upload interface with drag-and-drop support.
Assumption to check: Difficult file management and upload process
Validate with people who use this workflow before building.
Hypothesis 3
Add offline access to projects and sync capabilities.
Assumption to check: No offline capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a freemium model with limited features available for free.
Assumption to check: High price point with no free trial
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
Open .mpp files (created in Microsoft Project) directly on your iPhone, iPad, or Mac — no subscription, no cloud, no Microsoft Project required. MPP Viewer lets you view, explore, and share project plans stored in .mpp format. Whether a colleague sends you a project file or you need to review a schedule on the go, MPP Viewer opens it instantly and renders it as a crisp, publication-quality Gantt chart — entirely on your device. KEY FEATURES - Open .mpp files — supports a wide range of .mpp file versions - Interactive Gantt view — browse tasks, milestones, and timelines with ease - Publication-quality PDF export — generate a shareable Gantt PDF in seconds - Task list view — review all project tasks, dates, and durations at a glance - 100% offline — all parsing, rendering, and PDF generation happens on-device - No account, no subscription, no data ever leaves your device - Native app — Used by project managers, consultants, freelancers, and anyone who receives .mpp files from colleagues or clients. PRIVACY FIRST MPP Viewer is a pure offline application. No servers are operated by the developer, and no project data is ever transmitted externally. Everything stays on your device. --- LEGAL NOTICE MPP Viewer is an independent application and is not affiliated with, endorsed by, or sponsored by Microsoft Corporation. "Microsoft Project" and ".mpp" are trademarks of Microsoft Corporation. MPP Viewer uses a custom-built binary parser to read .mpp files and does not use or distribute any Microsoft software.
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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.
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BUILD KIT DIFFICULTY
Advanced
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.
