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
Last War:Survival
A global zombie infestation has converted many into zombies
Free · In-app purchases
OVERALL US RANK
#46
Grossing · all categories
REVENUE (Est)
$869K/mo
$497K - $1.2M
RATING
★ 4.7
450,195 ratings · Top 15%
Evidence scope: #46 is the current overall US Grossing 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included18 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 Last War:Survival: map the core Games 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 clear tutorial on available purchases and benefits.
Assumption to check: In-app purchases can be confusing for users.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce instant upgrade options through ads or premium currency.
Assumption to check: Long wait times for building upgrades.
Validate with people who use this workflow before building.
Hypothesis 3
Create a more robust social element, like guilds or team battles.
Assumption to check: Limited interaction with other players.
Validate with people who use this workflow before building.
Hypothesis 4
Add varied missions and events to keep players engaged.
Assumption to check: Repetitive gameplay can lead to boredom.
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
A global zombie infestation has converted many into zombies. As a survivor, your primary goal is to retain your humanity and survive - Think Fast, Move Faster! Begin your journey with an intense survival challenge. Dodge and combat waves of zombies. It's not just about survival; it's about quick reflexes and strategic thinking, as each lane presents unique obstacles and zombies! - Create Your Zombie-Free Shelter Customize your base and expand your army - you are the light in this shelter, leading people towards a glimmer of hope. In this strategic game, your choices in building and developing your base will shape the future of your survivors in a world overrun by zombies. - Assemble Your Dream Team Assemble your ultimate team by recruiting heroes. With a choice of three military branches, each hero comes with their own unique skills. Combine different heroes to easily achieve victory against the zombies. - Unite for the Greater Good In the challenging world of zombies, survival is a team effort. Partner with players from all over the globe to battle the zombies. Stay alert – alliances are complex, and not every survivor you encounter is friendly. How long can you last in this apocalypse? Join Last War: Survival Game and embark on a thrilling journey of survival and strategy! About the developer FUNFLY PTE. LTD. [email protected] 600 North Bridge Road #04-01 Parkview Square Singapore 188778 +65 8082 5566
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-native-gesture-handler
BUILD KIT DIFFICULTY
Expert
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.
