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
Mail+ for Outlook
########################################
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.9
841 ratings · Top 50%
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 included18 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 Mail+ for Outlook: 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
Allow users to set custom notification sounds and preferences.
Assumption to check: Limited customization options for notifications.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more reliable syncing mechanism.
Assumption to check: Inconsistent syncing with Outlook accounts.
Validate with people who use this workflow before building.
Hypothesis 3
Add filters and advanced search options for better email management.
Assumption to check: Lack of advanced search features.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to manage multiple email accounts seamlessly.
Assumption to check: No support for multiple accounts.
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
######################################## - Securely access Outlook Email and Calendar - #1 Outlook/Exchange Email App - Top 5 business apps, peaked at 55 overall ######################################## Keep your work and personal email accounts separate. Access your work email with an all-in-one Outlook/Exchange solution with tools designed for mobile business users. Read and compose Outlook emails and manage your calendar directly from any iOS device. No more using the web browser to access your Outlook account! -Read and reply to all Outlook email (includes subfolders) -Open and forward attachments -Compatible with PDF, XLS, DOC, JPG files -Exchange 2013, 2010, 2007, 2003, Office 365 business - Rich HTML Text Editing - Out of Office - Scheduling Assistant -View, create calendar events (and reminders) -Search Exchange Global Address Book -Access contact details (name, tile, phone) -Landscape mode (great for iPad) -User-friendly design with easy navigation -Excellent customer support -Signature feature available -Passcode protection for extra security -Secure login -Multiple accounts -Works on iPhone, iPad over 3G or WiFi -Connect to Microsoft Exchange 2003, 2007, 2010 -Compatible with Microsoft Office 365, Gmail, Outlook.com, Yahoo, AOL Connect with us! http://www.mailplusapp.com http://www.twitter.com/mailplusapp http://www.mailplusapp.com/news Outlook is a registered trademark of Microsoft Corporation. This application has been developed by a third party developer and is not endorsed, tested, or associated with Microsoft Corporation.
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.
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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.
