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
DayStayed: Residency Tracker
DayStayed tracks how many days you spend in each state and country, automatically, so you always know where you stand on residency day-counts.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 5.0
1 ratings · Top 5%
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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What's included
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
DayStayed tracks how many days you spend in each state and country, automatically, so you always know where you stand on residency day-counts. Time split across state lines or borders? Residency and tax rules often turn on a day count, like the 183-day rule, and missing it by a few days can be costly. DayStayed keeps an accurate daily record in the background so you don't have to remember where you were. HOW IT WORKS - Automatic daily tracking. DayStayed records which state or country you're in each day, running quietly in the background. No check-ins required. - Manual entries and corrections. Add or fix any day yourself; your edits always win. - Threshold dashboard. See your day count for each jurisdiction you watch, how many days you have left, and alerts as you approach a limit. - Complete picture. Days you stay put carry forward, so your log stays continuous even when you don't move. FREE FOREVER Tracking, your dashboard, jurisdiction watching, and day-count alerts are free for as long as you use the app. Most competitors lock all of that behind a trial. DayStayed doesn't. DAYSTAYED PRO Upgrade when you need the paperwork: - CPA-ready audit report (PDF) with your day-by-day log, jurisdiction totals, threshold status, and methodology - Export to PDF and Excel - Multi-year history and reporting - Track unlimited jurisdictions DayStayed Pro is an annual subscription with a 7-day free trial. PRIVATE BY DESIGN Your location is yours. DayStayed never sells your data and has no ads or third-party tracking. Location is used only to determine your daily jurisdiction, and coordinates are encrypted. NOT TAX ADVICE DayStayed records facts about your location to help you track day-counts. It is not tax or legal advice and does not determine your residency or tax liability, confirm any conclusions with a qualified professional. DayStayed Pro is an auto-renewing annual subscription. Payment is charged to your Apple ID at purchase or at the end of the 7-day free trial. It renews automatically unless cancelled at least 24 hours before the period ends; manage or cancel in your App Store account settings. Terms: https://daystayed.app/terms · Privacy: https://daystayed.app/privacy
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
