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
Negative - Film Look Filter.
Featured as App Store's 'App of the Day'!
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
16 ratings · Top 30%
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 included18 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 Negative - Film Look Filter.: map the core Photo & Video 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
Offer a wider variety of customizable filters.
Assumption to check: Limited filter options compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more user-friendly interface for editing.
Assumption to check: Non-intuitive editing tools
Validate with people who use this workflow before building.
Hypothesis 3
Provide more affordable pricing tiers and features.
Assumption to check: High subscription cost for advanced features
Validate with people who use this workflow before building.
Hypothesis 4
Integrate social sharing options to increase engagement.
Assumption to check: Lack of community or social sharing 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
Featured as App Store's 'App of the Day'! Thank you for all your support. "The original photo wasn't great, so what can you do?" "It's your skill, not the app's fault?" Really? That's just an excuse from the people who made those apps. With Negative, one tap is all it takes — no matter what camera you shot with, make your photos stand out. * Some filters are available through additional in-app purchases. Film color + Film effects = The perfect film look. Create the fastest, most authentic film look photos with Negative. [Note: Our film look filters are inspired by existing film stocks, but do not replicate their exact colors.] Leave the complicated editing and retouching to other apps. Actually, don't waste your time on that stuff. Hand over the colors to Negative, and head out. With your favorite camera. Negative does one thing only. Turn your photos into film looks, with a single touch. —————— Five film look filters inspired by real-world film stocks, Five unique digitally-driven filters for those ready to try something new, And on top of that, monochrome filters that maximize the photographer's intent. That glow where light bleeds — add a warm red tint to your highlights with Halation. A dreamy atmosphere, like walking through fog — we've got Mist for that too. Film effects too strong? Choose the perfect feel from three intensity levels. Photo came out a bit dark? Try one of three auto-correction styles — Natural, Standard, or High Contrast. Like the date stamped on a film camera, engrave the date on your photo with Data Stamp. Now, escape the endless retouching rabbit hole and become a real photographer who lets the photos speak. —————— Film Look Filter List 1. CineStill800 Green 2. CineStill800 Blue 3. Classic Polaroid [Added 2023.08.29] 4. Ektar Brown 5. VisionChrome 6. Portra 400 7. Emma [Added 2023.08.11] 8. Gold 200 9. Orange Is The New Black [Added 2023.08.10] 10. Analog City 11. Tropical Juice [Added 2023.09.11] 12. Cine Magenta 13. 400 Tungsten 14. Shiny Portrait 15. Cherry Blossom 16. Monochrome [Added 2023.08.01] 17. In the Mood for Love [Added 2023.08.22] 18. Calm [Added 2023.08.14] 19. Retro Night [Added 2023.08.14] 20. Celebrity [Added 2023.10.04] 21. Dark Knight [Added 2023.10.17] 22. Night Blues [Added 2024.01.06] 23. Pastel Kino [Added 2024.01.24] 24. Eterna [Added 2024.03.20] 25. Emerald Sunset [Added 2024.03.20] 26. The Origin [Added 2025.06.24] 27. Pacific [Added 2025.06.24] 28. Timeless [Added 2025.06.24] Film Effects Updated [2026.02.11] 1. Halation (Classic, Cinematic, Dreamy) 2. Mist (1/8, 1/4, 1/2) 3. Auto Adjustment (Natural, Film Vlog, High Contrast) * Some filters are available through additional purchases. For the premium filter list, please refer to the 'In-App Purchases' section under 'Information' below. —————— - Having issues? If you're experiencing problems with the app or have suggestions, please send us an email. [email protected]
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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
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BUILD KIT DIFFICULTY
Intermediate
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.
