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.
em is a Markdown writing app for Mac, iPad, and iPhone, built on one idea: your writing files are yours, and you're the only one who should decide what to do with 'em.
$19.99
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
Your first Build Kit is free with a verified email.
Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for em — Markdown Writer & Editor: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
em is a Markdown writing app for Mac, iPad, and iPhone, built on one idea: your writing files are yours, and you're the only one who should decide what to do with 'em. WRITE 'EM WITH MARKDOWN Capture your thoughts in a distraction-free Markdown editor tuned for each device. em counts your words and reading time, but only if you want it to. FIND 'EM WITH SMART SEARCH Smart Search lists every file holding your words, the ones holding all of them first. Use quotes, +, -, OR and * for precision, filter by library, tag, status or year, and save any search as a Smart Folder that stays current. Only remember what a piece was about? Ask em. PROTECT 'EM WITH VERSION HISTORY Every edit is automatically versioned and backed up to iCloud. Compare and restore versions from any device, so an accidental deletion never costs you your writing. PUBLISH 'EM WITH GHOST Connect em to your Ghost site to edit, back up, and publish natively in Markdown that maps to Ghost's cards. em supports 19 Ghost editorial cards, plus drafts, scheduling, and newsletters. EXPLORE 'EM WITH AI (BUT ONLY IF YOU WANT TO) Ask em questions and get answers grounded in your files, not the internet. On OS 27, Siri can search, add, or edit notes in the libraries you approve. Get an Editorial Review from a prompt you can read and edit — it's a document in your library. em doesn't write your drafts; it helps you edit 'em. ALL FEATURES - Smart Search: Search operators, filters, and Smart Folders - Version History: Automatic versioning, stored in iCloud - Ghost Sites: Sync, edit, publish, and send newsletters - AI on Your Terms: On-device Apple Intelligence by default; optionally Claude, ChatGPT, or Gemini with your API key - Siri AI: Search, add, or edit notes in approved libraries (OS 27) - Ask em: Answers from your own archive - Editorial Review: AI feedback from a prompt you control - Apple Shortcuts: Start an AI conversation or publish to Ghost - Journaling Suggestions: Capture memories in Markdown (iOS) - Read Aloud: Hear your draft to catch what your eyes miss - Customization: Reader and Editor fonts and colors - Export: Save any Ghost post as a Markdown file - Offline Editing: Works without an iCloud or Ghost connection - Even More: Printing, word counts, and yes — em dash highlighting PRIVACY, PLAINLY em has no server. That's not a promise about what the developer does with your data — there's no backend, no account, and no company database where your writing could end up. Your writing syncs through your iCloud and nowhere else. AI features are off by default and, if turned on, run on-device with Apple Intelligence. Want a larger model? Connect Claude, ChatGPT, or Gemini with your own API key — your account, your billing, revocable anytime. em names the model answering, every time. Transparency Statement: AI was used in developing this app, but every feature idea, design call, and architectural decision was made by a human.
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited formatting options compared to desktop editors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No cloud sync
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Steep learning curve for new users
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
Not assessed in a Build Kit yet.
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.