App Overview

Delta - Game Emulator icon

Delta - Game Emulator

Testut Tech · Entertainment

Delta is an all-in-one emulator for iOS and iPadOS

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.8
28,074 ratings · Top 5%

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 included16 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.

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.

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

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Delta - Game Emulator: map the core Entertainment 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 broader range of supported games.

Assumption to check: Limited game compatibility for some users

Validate with people who use this workflow before building.

Hypothesis 2

Simplify controller configuration process.

Assumption to check: Complicated setup for controllers

Validate with people who use this workflow before building.

Hypothesis 3

Optimize app performance for lower-end devices.

Assumption to check: Frequent crashes on older devices

Validate with people who use this workflow before building.

Hypothesis 4

Implement cloud save for game progress.

Assumption to check: Lack of cloud save features

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

Delta is an all-in-one emulator for iOS and iPadOS. Delta builds upon the strengths of its predecessor, GBA4iOS, while expanding to include support for more game systems such as NES, SNES, N64, and DS. FEATURES Supported Game Systems • Nintendo Entertainment System • Super Nintendo Entertainment System • Nintendo 64 • Game Boy (Color) • Game Boy Advance • Nintendo DS • And plenty more to come! Online Multiplayer • Play online-compatible Nintendo DS games with friends around the world! • Connect via community Nintendo WFC servers • Choose one of the default servers, or provide a custom DNS Controller Support • Nintendo Switch Pro controllers, Joy-Cons • Nintendo Switch Online controllers (NES, SNES, N64) • PS4, PS5 • Xbox One S, Xbox Series X • MFi game controllers • Bluetooth & wired keyboards Save States • Save and load save states for any game from the pause menu. • Lock save states to prevent them from being accidentally overwritten. • Automatically makes backup save states to ensure you never lose your progress. • Support for “Quick Saves,” save states that can be quickly saved/loaded with a single button press (requires external controller). Cheats • Supports various types of cheat codes for each supported system: • NES: Game Genie • SNES: Game Genie, Pro Action Replay • N64: GameShark • GBC: Game Genie, GameShark • GBA: Action Replay, Code Breaker, GameShark • DS: Action Replay Delta Sync • Sync your games, game saves, save states, cheats, controller skins, and controller mappings between devices. • View version histories of everything you sync and optionally restore them to earlier versions. • Supports both Google Drive and Dropbox. Custom Controller Skins • Beautiful built-in controller skins for all systems. • Import controller skins made by others, or even make your own to share with the world! Hold Button • Choose buttons for Delta to hold down on your behalf, freeing up your thumbs to press other buttons instead. • Perfect for games that typically require one button be held down constantly (e.g. run button in Mario games, or the A button in Mario Kart). Fast Forward • Speed through slower parts of games by running the game much faster than normal. • Easily enable or disable from the pause menu, or optionally with a mapped button on an external controller. 3D/Haptic Touch • Use 3D or Haptic Touch to “peek” at games, save states, and cheat codes. • App icon shortcuts allow quick access to your most recently played games, or optionally customize the shortcuts to always include certain games. Game Artwork • Automatically displays appropriate box art for imported games. • Change a game’s artwork to anything you want, or select from the built-in game artwork database. Misc. • Gyroscope support (WarioWare: Twisted! only) • Microphone support (DS only) • Support for delta:// URL scheme to jump directly into a specific game. Delta Terms of Use: https://altstore.io/terms **Delta is in no way affiliated with Nintendo. The name "Nintendo" and all associated game console names are registered trademarks of Nintendo Co., Ltd.**

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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
Supabase
React Navigation
Zustand
React Native Reanimated
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.