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
Byword
Byword makes writing easier on your iPhone and iPad.
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
179 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 Byword: 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
Include rich text formatting features and more styling options.
Assumption to check: Limited formatting options compared to other markdown editors
Validate with people who use this workflow before building.
Hypothesis 2
Implement robust cloud sync with real-time updates.
Assumption to check: Syncing issues across devices
Validate with people who use this workflow before building.
Hypothesis 3
Add support for real-time collaboration on documents.
Assumption to check: No collaborative editing features
Validate with people who use this workflow before building.
Hypothesis 4
Offer more competitive pricing with a tiered subscription model.
Assumption to check: High price point for basic 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
Byword makes writing easier on your iPhone and iPad. # Key features of Byword - Designed to make writing with Markdown easier - Sync text documents across all your Mac, iPhone, iPad devices - Take all documents offline to access them anytime - Filter documents by searching all text (Find & Replace inside documents coming soon) - Alternate dark theme for extra comfort in low-light situations - The most complete Markdown support including footnotes, tables and cross-references - Export Markdown documents to PDF and HTML documents - Publish to Medium, WordPress, Tumblr, Blogger and Evernote # Optimized for iOS 13 - Dark mode support to match iOS preference; - Search documents directly from iOS Spotlight; - Multitasking and split screen on iPad; - Shortcuts to create new document and access most recent documents right from application icon. # Blog publishing Publish to Medium, WordPress, Tumblr, Blogger and Evernote from Byword. Publishing your story with Byword is as simple as: 1. Write in Byword 2. Open Tools and select Publish 3. Confirm metadata 4. Publish # More features - List continuations - TextExpander snippet expansion - Word and character counters with live update - Extensive VoiceOver support for visual impaired users - Spell and Grammar checking and Dictionary lookup - Keyboard shortcuts for formatting and navigating between screens Here are some ways to use Byword in your life: - For posting to your blog without using clunky web interfaces and risking losing your work - For research, meeting and class notes - To write that important email without being distracted - To capture ideas and notes and have them available in all devices # Rich text warning Byword for iOS only works with plain text formats. Supported file extensions are: txt, text, md, mmd, rmd, markdown, markdn, mdown, mkdn, markd and fountain. # Support We are proud to provide a super friendly customer support. If you need help and/or have suggestions, please contact us using the mediums below. Twitter: http://twitter.com/bywordapp Email: [email protected] Web: http://bywordapp.com
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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
react-native-markdown-display
@react-navigation/native
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.
