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
Otter - Food Diary
See what you eat at a glance—without making calorie counting a requirement.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
21 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/
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 Otter - Food Diary: map the core Lifestyle 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 a feature for barcode scanning or photo recognition of meals.
Assumption to check: Users find it hard to manually enter meal details.
Validate with people who use this workflow before building.
Hypothesis 2
Provide advanced analytics and personalized meal suggestions.
Assumption to check: Limited insights into dietary trends.
Validate with people who use this workflow before building.
Hypothesis 3
Simplify navigation and enhance visual hierarchy.
Assumption to check: User interface can feel cluttered.
Validate with people who use this workflow before building.
Hypothesis 4
Ensure robust data syncing using cloud storage.
Assumption to check: Syncing data across devices is inconsistent.
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
See what you eat at a glance—without making calorie counting a requirement. Otter is a calm, photo-first food diary for recording meals, noticing everyday patterns, and building awareness around how you eat. Take a photo, add a note, and let your meals collect in one clean timeline. No complicated food database and no strict diet plan. PHOTO FOOD JOURNAL • Save meals with photos in seconds • Add notes about your day, how you felt, or anything worth remembering • Browse past meals in a visual timeline NOTICE YOUR ROUTINE • Search past meals and notes • View simple statistics about your records • Look back across days and weeks to notice recurring habits WATER AND WEIGHT • Log daily water with quick taps • Record your weight and review entries over time SIMPLE BY DESIGN • Sync your records with iCloud • Stay focused with an ad-free, minimal experience • Enjoy Otter’s friendly character without unnecessary clutter Otter does not judge your choices or require every meal to become a number. Use it as a mindful meal journal, a visual food log, or a simple record of everyday life. Take one photo today. Over time, ordinary meals become a meaningful picture of your routine. Questions or feedback: [email protected]
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
react-navigation
axios
react-native-chart-kit
expo-image-picker
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.
