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
Winmail Reader
Winmail Reader is ultimate tool for reading "winmail.dat" attachment files on iPhones, iPads and iPod touch
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
256 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 included15 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 Winmail Reader: map the core Business 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
Expand support to other file formats.
Assumption to check: Limited file format support.
Validate with people who use this workflow before building.
Hypothesis 2
Add options for cloud storage access.
Assumption to check: No cloud integration.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize file handling for large documents.
Assumption to check: Inconsistent performance with large files.
Validate with people who use this workflow before building.
Hypothesis 4
Implement loading indicators and confirmations.
Assumption to check: Lacks user feedback on actions.
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
Winmail Reader is ultimate tool for reading "winmail.dat" attachment files on iPhones, iPads and iPod touch. Winmail Reader decodes "winmail.dat" file, and allows any attachments contained in them to be opened, read, saved or e-mailed. * * * Winmail Reader for Mac is also available on the Mac App Store. * * * Winmail.dat files are in fact TNEF format (Transport Neutral Encapsulation Format). Microsoft Outlook e-mail program for Windows send e-mails as TNEF. Most other e-mail programs, including Mail, do not understand TNEF. If your e-mail program doesn't understand TNEF, you may only see an attachment named "winmail.dat" that you cannot open. The easy-to-use solution to circumvent this problem is provided by Winmail Reader. FEATURES: ◆ Decodes "winmail.dat" files and list all attachments contained in it including email message. ◆ Inbuilt quick-look preview to view attachments. Tap on attachment button to popup quick-look preview. ◆ Allows attachments files to Copy to… another application, Save to Files, Copy, Print, share file to nearby iOS devices via AirDrop and more... Long press on attachment button to show share action options. ◆ Resend entire decoded email as it is with message and extracted attachments. ◆ Creates, edit and adds Microsoft Outlook Appointment and Meeting to iOS Calendar. It also reads embedded note. ◆ Creates and adds contact address card into iOS Contacts. ◆ Reads nested message in full RTF format as separate file.
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
React Navigation
Expo File System
Zustand
React Native Gesture Handler
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.
