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
Plain Text Editor By MCK
Plain Text Editor By MCK is a simple text editor for iPhone and iPad.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
2 ratings · Below Average
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 Plain Text Editor By MCK: 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
Introduce rich text editing features.
Assumption to check: Limited formatting options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud storage solutions.
Assumption to check: No cloud sync or backup options.
Validate with people who use this workflow before building.
Hypothesis 3
Create comprehensive user guides and FAQs.
Assumption to check: Minimal user support or documentation.
Validate with people who use this workflow before building.
Hypothesis 4
Redesign for a modern, user-friendly experience.
Assumption to check: Basic user interface feels outdated.
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
Plain Text Editor By MCK is a simple text editor for iPhone and iPad. Open, edit and save plain text files directly from the Files app. It works with many text-based file types, including TXT, Swift, Python, HTML, CSS, JSON, XML, PLIST, BAT, shell scripts, logs and more. The app is made for quick editing without extra clutter. You can create a new file, choose a file name and extension, search inside long files, jump between matches, undo and redo changes, and save your work. Use it for notes, code snippets, scripts, configuration files, logs, plain text documents and other text files. Main features: • Open text files from Files, iCloud Drive and On My iPhone • Create new files with custom extensions • Edit TXT, Swift, Python, HTML, CSS, JSON, XML, PLIST, BAT and more • Search inside files • Jump between search results • Undo and redo text changes • Save and Save As • Simple focused interface • Works on iPhone and iPad Plain Text Editor is designed to be fast, clean and easy to use.
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
Zustand
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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.
