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
Handwritten email
Send your email and MMS texting with handwritten text
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.3
58 ratings · Top 30%
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/
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 Handwritten email: map the core Social Networking 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 handwriting fonts and styles.
Assumption to check: Limited customization options for handwriting styles
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline email composition and queuing.
Assumption to check: No offline capability
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to format text (bold, italics, etc.).
Assumption to check: Lack of rich text formatting
Validate with people who use this workflow before building.
Hypothesis 4
Enhance notification reliability for email updates.
Assumption to check: Push notification issues
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
Send your email and MMS texting with handwritten text. This will give your emails a nice personal touch. Type on a conventional onscreen keyboard and the app will convert the text into handwritten text. What users say: - This is a lovely little app that is a pleasure to use and receive according to my fellow iPhone friends. 5 stars from me. - It is a must have. All my friends are like "How did you do that?" - Such a wonderful compliment to an email. The reviews I've received back are tremendous. - Love fancy fonts and pretty colors! - So cool, fun and neat Features: - Choose between several handwritten and calligraphy styles and other cool styles, like gothic, medieval, celtic, ... - Change the color and size of the text. - Choose between 20 background patterns and pictures. - Change background color. - Copy the handwritten text and paste it into an MMS or into other apps. (available through the action button) - Switch between preview mode and editing mode (offers cursor positioning for easier text editing, select, copy, cut and paste). - Change text alignment. - Copy and paste (activate editing mode in the settings screen). - Get additional style packs containing additional text fonts and background images (accessible in the settings screen) Follow us on twitter @PlanetBlueArt
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
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BUILD KIT DIFFICULTY
Starter
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.
