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
Huji Cam
DISCLAIMER NOTICE: HUJI CAM IS PROVIDED AS MANHOLE'S OWN PRODUCT
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
11,950 ratings · Top 30%
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 Huji Cam: map the core Photo & Video 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 advanced editing tools like cropping, text overlays, and adjustments.
Assumption to check: Limited editing features compared to full photo editing apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clearer paywall and user-friendly subscription info.
Assumption to check: In-app purchases can be confusing and deter users.
Validate with people who use this workflow before building.
Hypothesis 3
Thorough testing across devices and timely updates.
Assumption to check: Occasional bugs with camera functionality on older devices.
Validate with people who use this workflow before building.
Hypothesis 4
Create a modern, minimalist design for a better user experience.
Assumption to check: User interface can feel outdated and cluttered.
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
DISCLAIMER NOTICE: HUJI CAM IS PROVIDED AS MANHOLE'S OWN PRODUCT. THIS APP IS NOT THE OFFICIAL APP OF FUJIFILM OR ANY OTHERS. MANHOLE HAS MADE EVERY EFFORT TO ENSURE NOT TO INFRINGE OTHER'S COPYRIGHTS OR TRADEMARKS. HUJI Cam makes your moments as precious as the feelings of analog film with old memories. Camera makers of every era always tried to capture the best moments and such an effort continued back in 1998 as well, whereby our memories became clearer. HUJI Cam has the effort of those days to leave precious moments as vivid and vibrant photographs. - How to run through time on SNS : #HUJI Take a picture having a feeling just like the year 1998 with HUJI Cam. - How-To Look close to Viewfinder to see things bigger while holding your iPhone in Landscape Mode. If this feature troubles you, active Viewfinder Touch Mode via Lab > Settings Icon. That way you can now make the view finder bigger or smaller by tapping. For detail, check out on our SNS which you can easily visit via the button in Settings within the app. - When HUJI Cam does not work 1. Go to Settings app of your iPhone and scroll down to find HUJI 2. Turn off Camera among the ACCESS permission list for the time being. 3. Run HUJI Cam again. Tap 'Resolve Problems' on the bottom of the Camera Access notice
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
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@react-native-community/share
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.
