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
SubTally
SubTally is a quiet little app for the streaming, software and small monthly things that quietly stack up.
$0.49 · In-app purchases
PRICE
$0.49
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 included14 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 SubTally: 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
Ensure a clean, minimalist design with clear CTAs.
Assumption to check: Users often find subscription management apps to be cluttered and difficult to navigate.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate with payment APIs to automatically track payments.
Assumption to check: Lack of automatic payment tracking leads to missed payments.
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create custom categories and tags for subscriptions.
Assumption to check: Limited customization options for subscription categories.
Validate with people who use this workflow before building.
Hypothesis 4
Implement robust notification settings to customize alerts.
Assumption to check: Inconsistent notifications for upcoming bills.
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
SubTally is a quiet little app for the streaming, software and small monthly things that quietly stack up. No accounts. No cloud. No tracking. Just your subscriptions, tallied on your device — so you can finally see what you're actually paying for each month. WHAT IT DOES - One hero total — your monthly and annual spend, normalised across weekly, monthly, quarterly and yearly cycles, right at the top of the home screen. - Sorted by renewal — active subscriptions are ordered by what's coming next, so the bill that matters tomorrow is at the top. - Local reminders — get nudged the day before a renewal, scheduled directly on your phone. No push servers, no notification middleman. - Trials and pauses — mark anything as a free trial or temporarily paused. Those don't roll into your monthly total, only what you're actually paying. - 42 ready-to-go services — Netflix, Spotify, Notion, iCloud+, Disney+, YouTube Premium and more, each with the right icon and colour. Or add anything custom in seconds. - Made to match — light, dark or automatic, paired with seven accent colours (teal, blue, indigo, purple, rose, orange, green). - Export anytime — send your full list out as a CSV through the system share sheet. Your data, your move. PRIVACY BY DESIGN SubTally has no backend. It does not connect to any server. It does not collect, transmit or store any of your data on the internet. Everything you enter lives in local storage on your iPhone, and that's where it stays. The app behaves identically in airplane mode as it does online. No sign-up. No login. No analytics SDK. No advertising. No trackers of any kind. ONE-TIME PURCHASE SubTally is a one-time AU$0.99 download. No subscription to track a subscription tracker. No in-app purchases, no premium tier, no upsells. REQUIREMENTS - iPhone running iOS 16 or later - Works fully offline
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
React Navigation
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Axios
BUILD KIT DIFFICULTY
Starter
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.
