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
Visa & Tax Days Tracker: Immio
Track days spent in every country – automatically via GPS
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.2
4 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 Visa & Tax Days Tracker: Immio: map the core Travel 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 more intuitive activity overview with filtering and sorting options.
Assumption to check: Users find it hard to manage multiple activities effectively.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce push notifications to remind users of upcoming visa and tax obligations.
Assumption to check: The app lacks reminders for upcoming deadlines.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance reporting with interactive charts and graphs.
Assumption to check: Users want better data visualization features.
Validate with people who use this workflow before building.
Hypothesis 4
Develop a guided onboarding experience to help users set up their profiles and understand app features.
Assumption to check: The onboarding process is unclear.
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
Track days spent in every country – automatically via GPS. Stay compliant with visa limits, tax residency rules, and immigration requirements without lifting a finger. 14-day free trial. No account. No email. 100% private. Built for frequent travelers, digital nomads, expats, snowbirds, cross-border commuters, dual residents, overseas homeowners, remote workers, and international students who need to track time across borders. AUTOMATIC LOCATION TRACKING Enable GPS auto-detection, and your day count updates itself. No manual entries needed. Days in each country are logged based on where you actually are – including every cross-border trip. REAL-TIME STAY LIMIT TRACKERS Set rules for any country and monitor compliance live: • Schengen Area – 90/180-day rolling window • USA – Substantial Presence & Physical Presence Tests • UK – Statutory Residence Test (SRT) & ILR • Canada – physical presence requirements • Australia, France, Italy, Spain, Malaysia, India – 183-day rules • Cyprus – 60-day rule • New Zealand – non-residency absence counting • Israel – fiscal residency rules • Tourist visas, long-stay visas & residence permits • Avoid or Reach Tax Residency • Custom trackers for any rule or threshold SCHENGEN TRACKER See exactly how many of your 90 days you've used in the current 180-day window – across all Schengen countries at once. Coming soon: Schengen stay calculator. TRIP TIMELINE & HISTORY Log past and future trips. View stay durations by country. Let residency data auto-fill gaps in your history. TRAVEL PLANNING Add upcoming trips to project day counts and check how future travel affects your fiscal residency or visa status – before you go. EXPORT & REPORTING Generate a CSV for tax or legal review. Open directly in Excel or Google Sheets to share with your accountant or adviser. 100% PRIVATE & OFFLINE All data stays on your device or private iCloud sync. No sign-up. No account. No personal data is ever collected. Works fully offline. –– Immio is for informational use only. Always consult a qualified legal or tax adviser for your specific situation. Terms of Use: https://immio.app/terms Privacy Policy: https://immio.app/privacy
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.
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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.
