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
zen-Babel
zen-Babel is a translation app that works entirely offline.
$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'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 zen-Babel: map the core Reference 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 social features for language practice with friends.
Assumption to check: Limited interaction options compared to competitive apps
Validate with people who use this workflow before building.
Hypothesis 2
Implement adaptive learning algorithms to tailor study plans.
Assumption to check: Lack of personalized learning paths
Validate with people who use this workflow before building.
Hypothesis 3
Introduce achievements, badges, and leaderboards.
Assumption to check: No gamification features to motivate users
Validate with people who use this workflow before building.
Hypothesis 4
Expand to include more languages and dialects.
Assumption to check: Limited language support
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
zen-Babel is a translation app that works entirely offline. All translation is performed on your device—your data is never sent to the cloud. Simple to use: type, paste, or import text from files and images to translate. No ads. No subscriptions. A one-time purchase of 0.99 USD unlocks all features. With language packs from the standard Translate app, you can translate even without mobile data or Wi-Fi. zen-Babel supports text files, Word documents, PDFs, and text extraction from images. Even when connected to the internet, your documents never leave your device. This makes it ideal for translating sensitive business materials and privacy-critical content. Choose between fast, reliable machine translation and more natural AI-powered translation using Apple Intelligence. Use machine translation for speed, or AI translation for more fluent, context-aware results. The app also features Translation Clutch, which highlights the original text and translation side by side. You can quickly compare, understand, and refine translations—especially useful for long texts or fragmented conversations.
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
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expo-av
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.
