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
Terraria
The world is at your fingertips as you fight for survival, explore for fortune, and dig for glory
$4.99 · In-app purchases
OVERALL US RANK
#19
Paid · all categories
REVENUE (Est)
$460K/mo
$271K - $650K
RATING
★ 4.5
47,687 ratings · Top 15%
Evidence scope: #19 is the current overall US Paid chart position. 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 Terraria: 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
Provide a comprehensive tutorial and tips system.
Assumption to check: Steep learning curve for new players
Validate with people who use this workflow before building.
Hypothesis 2
Optimize performance for lower-end devices.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Implement better multiplayer functions or co-op gameplay.
Assumption to check: Limited multiplayer features
Validate with people who use this workflow before building.
Hypothesis 4
Introduce sorting and filtering options in inventory.
Assumption to check: Difficulty in inventory management
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
The world is at your fingertips as you fight for survival, explore for fortune, and dig for glory. Delve deep into cavernous expanses, test your mettle in combat, or construct your own city! Terraria offers more than ever - including the brand new 1.4.5 Bigger and Boulder Content! Presenting an impressive catalogue of 5,000+ items, 25+ NPCs, and 400+ enemies and blending elements of classic action games with sandbox-style creativity, Terraria is truly a unique adventure! The latest content update includes: NEW 1.4.5 CONTENT: - Dead Cells crossover content – new weapons, combat accessories and more! - Iconic Pals from Palworld have arrived in Terraria! - Fifteen new furniture sets. - Five new types of boulders — watch your step! - Four new transformation mounts. - New whips and Summoner prefixes. - New Kites, critters, and decorative features. - And so much more to discover! NEW WORLD SEEDS TO DISCOVER: - A new Skyblock world seed. - A new world creation menu allowing you to mix and match special seeds. - Improvements to existing seeds! IMPROVEMENTS: - Reworks and balance improvements to weapons. - Visual updates to many classic sprites. - And so many more improvements! • MULTIPLAYER – Play with up to 7 friends on Local Wifi or Online via device-device Wifi hosted games or through the Mobile Terraria Dedicated Server for PC (available for free on Terraria.org) • TERRARIA REIMAGINED FOR MOBILE – Fully customizable controls and User Interface provide a level of polish and capability not previously possible! • Gamepad support – including fully-remappable buttons - Play with your Bluetooth connected gamepad where supported. • Full array of World sizes – Small/Medium/Large...the same size as on Terraria for PC! Now includes random world name generator and the ability to use World Seeds (including some hidden easter egg worlds) • Over 400 enemies to combat, defeat, and plunder for loot • Over 20 Biomes and Mini-Biomes to explore, both above and underground – from lush forests to barren deserts to dungeons, the underworld, and even the terrifying Corruption await! • Updated crafting with multiple added item options • Over 20 NPCs to discover, each providing their own benefits and unique style • More than 1000 new items to discover – bringing the total item count to more than 5000! • In-depth building options that are easy to learn but allow for amazing feats of architecture in the hands of a master. • And much, much more! In short, every pixel of Terraria has been reimagined and hand crafted for the BEST possible mobile experience! Follow us on Twitter @Terraria_Logic and @505_Games Join our community on Discord @ http://Discord.GG/Terraria Like us on Facebook at www.facebook.com/TerrariaOfficial and https://www.facebook.com/505Games Visit us on the web at www.terraria.org Join the official Terraria Forums at: https://forums.terraria.org/
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
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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.
