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
Tax Residency Tracker: Sarmiza
Sarmiza is the most intuitive way to track your days for tax residency or visa purposes
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.4
54 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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
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 Tax Residency Tracker: Sarmiza: map the core Travel workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
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
Provide simplified guides and automated alerts for residency status changes.
Assumption to check: Users may find tracking tax residency complicated due to varying regulations.
Validate with people who use this workflow before building.
Hypothesis 2
Integrate a broader resource library with expert contributions.
Assumption to check: Limited resources and articles can lead to user frustration.
Validate with people who use this workflow before building.
Hypothesis 3
Create a clear pricing structure and feature comparison in the Profile section.
Assumption to check: In-app purchases may not be clearly communicated, leading to confusion.
Validate with people who use this workflow before building.
Hypothesis 4
Implement a calendar view to visualize trips and residency periods.
Assumption to check: Users might face difficulties in managing multiple trips.
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
Sarmiza is the most intuitive way to track your days for tax residency or visa purposes. You select your locations, set minimum or maximum day limits, and then simply track. ▶ Privacy: Your personal data stays where it belongs - on your device. ▶ Offline: Sarmiza works completely offline so you can stay updated, no internet required. ▶ Set Limits: Easily define min/max day limits for all countries, US States & Territories, and monitor your progress. Stay ahead with customized alerts. ▶ Automatic Location Tracker: Your timeline updates automatically based on your location. ▶ Timeline: Update and review your travel timeline. Easily see a summary day count per jurisdiction for any reporting period. ▶ Photo to Timeline: Generate travel timeline in seconds completely offline using location data from photos without accessing the actual contents. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://sarmiza.io/company/privacy
Written user reviews are not shown here. Check current App Store reviews >
Screenshots
< Scroll to see more >
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
Axios
React Navigation
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.
