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
Zentry: Subscription Tracker
Subscriptions are easy to start and easy to forget
$1.99 · In-app purchases
PRICE
$1.99
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 Zentry: Subscription Tracker: map the core Finance 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 reminders and notifications for due dates.
Assumption to check: Users often forget about upcoming subscription payments.
Validate with people who use this workflow before building.
Hypothesis 2
Provide bulk actions for editing or deleting multiple subscriptions.
Assumption to check: Difficulty in managing multiple subscriptions at once.
Validate with people who use this workflow before building.
Hypothesis 3
Add charts or graphs to visualize total spending over time.
Assumption to check: Lack of visualization for spending trends.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to add notes or tags for each subscription.
Assumption to check: Limited customization for subscription details.
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
Subscriptions are easy to start and easy to forget. A free trial here, an app there, a streaming plan you split with someone two years ago - it adds up faster than you think. Zentry brings all of it into one calm, beautiful place, so you always know exactly what you are paying for. NEVER GET SURPRISE-CHARGED AGAIN See every renewal before it lands. Zentry reminds you 7, 5, 3, or 1 day ahead of any charge - and well before a free trial quietly turns into a paid one. The home screen widget keeps your next renewal one glance away. KNOW WHERE YOUR MONEY GOES A clean overview shows your real monthly and yearly spend, your biggest subscriptions, and how your money splits across categories. The subscription you do not need has never been this easy to spot. SPLIT PLANS WITHOUT THE AWKWARD MATH Sharing a streaming or music plan? Track exactly who pays what - 50/50, a custom share, or "they pay." Zentry shows your real cost, not the sticker price. 100% PRIVATE. NO ACCOUNT NEEDED. Zentry works the second you open it. No sign-up, no login, no cloud. Everything stays on your iPhone, and you can lock the entire app behind Face ID. No ads. No data harvesting. Ever. EVERYTHING IN ZENTRY - Smart Import - snap a photo of a receipt or import a CSV / Google Sheet - Built-in catalog of popular services, with logos - Calendar view of every upcoming renewal - Sync renewals straight to your Apple Calendar - 16 currencies with live exchange rates - Export a clean PDF summary anytime - Designed dark, with a soft glass finish PAY ONCE. THAT IS IT. Zentry is a one-time purchase - no in-app purchases, no subscription. It may be the only thing on your phone that will not bill you again next month. Take back control of your subscriptions - calmly, privately, and for good. Download Zentry today.
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
Zustand
React Navigation
Axios
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.
