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
vanilla.txt
vanilla.txt is a minimalist editor purpose-built for plain text (.txt) on iPhone and iPad
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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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 vanilla.txt: 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
Add advanced formatting features like bullet points and text styles.
Assumption to check: Limited formatting options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement categories and tagging system for better organization.
Assumption to check: Lack of organization features for notes
Validate with people who use this workflow before building.
Hypothesis 3
Add cloud sync for notes across devices.
Assumption to check: No sync options for multi-device access
Validate with people who use this workflow before building.
Hypothesis 4
Introduce shared notes for team collaboration.
Assumption to check: No collaboration features
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
vanilla.txt is a minimalist editor purpose-built for plain text (.txt) on iPhone and iPad. Open or create files directly from the iOS Files app (including iCloud Drive), write with a clean, responsive editor, and your changes save automatically. It’s ideal for notes, drafts, outlines, logs, and code snippets you want to keep portable and future-proof. Features: - Real .txt files via the iOS Files app (incl. iCloud Drive) - Autosave while you type for reliable editing - Simple, distraction-free text layout - Readable typography with a default monospace font - Dark Mode support - System share sheet (Share / Open In…) - Appears in the iOS Share Sheet; save shared text as .txt - No analytics or tracking - Works offline; no account required Plain text stays lightweight, easy to back up, and compatible with every platform. Keep your writing simple, portable, and under your control.
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
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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.
