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
OK JSON - Viewer & Formatter
OK JSON is a native and scriptable JSON formatter on macOS
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
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's included17 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 OK JSON - Viewer & Formatter: map the core Developer Tools 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
Implement advanced JSON parsing and formatting options.
Assumption to check: Users struggle with formatting complex JSON structures.
Validate with people who use this workflow before building.
Hypothesis 2
Add options to share formatted JSON via email or social media.
Assumption to check: Limited sharing options for formatted JSON.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the restore purchases process with clearer messaging.
Assumption to check: Difficulties in restoring purchases for users.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce loading indicators while formatting JSON.
Assumption to check: Lack of user feedback during formatting.
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
OK JSON is a native and scriptable JSON formatter on macOS. It’s really fast and well-integrated with macOS. The notable features from OK JSON are: - JSON structure in both tree view and text editor. - Drag-and-drop, Dark Mode, URL Schemes, Quick Look, and excellent performance. - Built-in support for jq and JSONPath. - Save viewing history to local database. - Process JSON string with custom scripts powered by JavaScriptCore. - Quick Look extension and official Raycast extension. Build your own with Apple Script. - Support opening JSON Lines, NDJSON, and plist files as well. While OK JSON is a JSON formatter to the core, the Scripts feature also makes it a text-processing tool. You can try all of OK JSON’s features for free for 14 days and purchase the Pro version with one-time payment and get free lifetime updates. Visit our website https://okjson.app for more info. Don’t forget to checkout our documentation websites https://docs.okjson.app.
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
React Navigation
Firebase
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BUILD KIT DIFFICULTY
Advanced
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.
