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.
Spark: The Essential Tool for Managing Ren'Py Visual Novels
$6.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Spark - Ren'Py Novels: map the core Utilities workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited project management features
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No cloud sync options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Minimal export formats
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Spark: The Essential Tool for Managing Ren'Py Visual Novels Spark is an independent utility for organizing and launching Ren'Py visual novels. It is not affiliated with or supported by the official Ren'Py project. For any issues with this app, please contact Spark support, not the Ren'Py team. Launch and Play Your Novels with Ease Import and start your favorite Ren'Py visual novels directly in Spark. Once added, your titles are ready to launch with a tap, so you can focus on reading and playing instead of manual setup. Tailored Compatibility for Each Novel Choose from multiple Ren'Py engine versions to match your novel and improve stability: 8.x: 8.5.2, 8.5.0, 8.4.1, 8.3.7, 8.3.4, 8.2.3, 8.1.3, 8.0.3 7.x: 7.8.8, 7.8.4, 7.7.3, 7.6.3, 7.5.3, 7.4.11 Per-novel configuration lets you: - Select the best Ren'Py version for each title - Fine-tune settings to improve quality of life. - Improve performance on complex or older games Note: Performance and compatibility vary by novel. Older titles or very large games may contain bugs or fail to run. Smaller devices can experience rendering issues. Some novels may not work at all, though we strive to support as many as possible. Powerful Save Management Take full control of your progress across all novels: - View all saves in one place instead of hunting through folders - Backup saves before big choices or endings so you can revisit them anytime - Restore old saves if something breaks or you want to replay a specific branch - Import saves from other devices and delete unwanted saves to keep things tidy Organize Your Entire Library Keep your Ren'Py collection clean and easy to navigate: - See all installed novels at a glance - Rename titles to match your personal library style - Manage multiple versions of the same novel, such as different language patches or updated builds Flexible Novel Import Add new novels from a variety of common formats: - Import from zip, apk, 7z, tar, or rar files - Quickly bring in titles from backups, downloads, or other devices Once imported, novels become part of your Spark library with version and save management ready to use. Ren'Py-Specific Tools and Enhancements Dig deeper into your visual novels with advanced utilities: Gallery Viewer - Browse novel assets directly inside Spark - Inspect images and other media used by the game Variable Editor - View and edit game variables while playing - Skip grinding, fix bugged flags, or jump to specific routes by adjusting in-game values On-Device Translation - Translate novels using Apple’s on-device translation system - Make foreign-language titles more approachable without leaving the app - Keep translations private and fast by staying on your device Your Gateway to the Ren'Py Visual Novel Universe While Spark is not affiliated with Ren'Py, it is designed as a powerful companion for players who want full control over how they install, launch, customize, and maintain their Ren'Py visual novels in one place. Additional Licensing Information Ren'Py includes free software licensed under various terms, including the GNU Lesser General Public License. For a complete list of included software and license details, please visit the official Ren'Py website. Terms of Use https://spark.devl.ai/reference/terms/
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.