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
T-Life
Whether you’re shopping, managing your account and devices, looking for a new plan, or snagging exclusive benefits, start with the T-Life app
Free · In-app purchases
OVERALL US RANK
#33
Free · all categories
REVENUE (Est)
$276K/mo
$160K - $393K
RATING
★ 4.8
1,266,382 ratings · Top 5%
Evidence scope: #33 is the current overall US Free chart position. 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
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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/
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.
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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 T-Life: map the core Lifestyle 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
Allow users to create custom goal types and settings.
Assumption to check: Limited customization options for personal goals.
Validate with people who use this workflow before building.
Hypothesis 2
Implement gamification features to encourage user interaction.
Assumption to check: Inconsistent community engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Provide clearer visual indicators and notifications for rewards.
Assumption to check: Difficulties in tracking rewards progress.
Validate with people who use this workflow before building.
Hypothesis 4
Add offline tracking capabilities for activities.
Assumption to check: Lack of offline functionality.
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
Whether you’re shopping, managing your account and devices, looking for a new plan, or snagging exclusive benefits, start with the T-Life app. • Shopping for a new device? Shop our widest selection without leaving your couch. • Access exclusive benefits including Netflix On Us and savings on travel and dining. • Get freebies, fun perks, and a chance at epic prizes on T-Mobile Tuesday. • Try the Best Network and some of our favorite benefits for 30 days. For free. • Switch to T-Mobile. Check out rate plans, shop devices, and more. • Manage your account, pay bills, and track your usage with just a few taps. • Configure your T-Mobile Home Internet gateway with ease. • Stay connected with SyncUP devices for home, car, and family. • Access your T-Mobile Money® and T-Mobile Visa® accounts. • Protect yourself from spam and robocalls with Scam Shield. T-Mobile Trial: Limited-time; subject to change. Available to non-T-Mobile customers only. One trial per user. A compatible device is required. A 5G-capable device is required to access the 5G network. BEST: Based on analysis of Ookla® of Speedtest Intelligence® data 2H 2025. T-Mobile MONEY Banking services are provided by Coastal Community Bank, Member FDIC. T-Mobile is not a bank.
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
Supabase
React Navigation
React Query
BUILD KIT DIFFICULTY
Advanced
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.
