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
Sephardic Siddur
The first and only multi-lingual Sephardic Siddur available in five languages. All your daily prayers in your pocket! Each prayer includes specific instructions in each language for both men and women, as well as fo...
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
26 ratings · Top 15%
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 Sephardic Siddur: map the core Books 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 user-generated content to expand prayer library.
Assumption to check: Limited prayer selection compared to physical siddurs
Validate with people who use this workflow before building.
Hypothesis 2
Implement text search and bookmarking features.
Assumption to check: Difficult to navigate long texts
Validate with people who use this workflow before building.
Hypothesis 3
Ensure high-quality audio recordings for each prayer.
Assumption to check: Inconsistent audio quality
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to download prayers for offline use.
Assumption to check: No offline access to prayers
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
The first and only multi-lingual Sephardic Siddur available in five languages. All your daily prayers in your pocket! Each prayer includes specific instructions in each language for both men and women, as well as for leader (hazan) and congregation. Sephardic Siddur app contains voweled text for Hebrew readers for easier reading and pronunciation, as well as accurate translation and transliteration for Russian and English readers with added phonetic representation. Sephardic Siddur app does not require internet connectivity to operate after initial download. Prayers available in the following languages: - Hebrew - English - English Transliteration - Russian - Russian Transliteration Application features: ‣ Support for Shabbat Times and Hebrew Calendar ‣ Location based display for Hebrew calendar and Shabbat times ‣ Select Hebrew/Gregorian date as far as 100 years forward ‣ Compass - Pray in Right Direction ‣ Night/Day Mode ‣ Notification History ‣ Font-Size control bar ‣ Change font ‣ Requests for Leilu Nishmat option ‣ Language-based menus with simple navigation ‣ Instructions in each language for men, women, leader (Hazan) and congregation ‣ Based on Toldot Mizrahi order of prayers ‣ No internet required for use (except for initial installation) ‣ Get newly available prayers and updates ‣ Search for prayers ‣ Bookmark favorite prayers ‣ Zoom in/out prayers for easy readability ‣ Lightweight & fast loading 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
Supabase
@react-navigation/native
Zustand
react-native-gesture-handler
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.
