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
CineTools
CineTools is the battery and data calculator app for video professionals.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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/
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 CineTools: 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 more advanced editing tools like AI background removal and batch editing.
Assumption to check: Limited editing features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud backup to save edits and projects.
Assumption to check: No cloud storage for user edits
Validate with people who use this workflow before building.
Hypothesis 3
Create a guided tutorial to help users understand app features.
Assumption to check: Poor user onboarding experience
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and save custom filters.
Assumption to check: Lack of customization options for filters
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
CineTools is the battery and data calculator app for video professionals. "How long will these batteries last on a FX6 with Cine 7 monitor?" "How much drive space will I need for this Alexa Mini interview shoot?" "How much will adding a Tilta follow focus effect my battery runtime?” If you've ever asked these questions on set, when prepping for a shoot or even discussing kit purchases, then this is the app for you. CineTools was developed by video pros to be the go to battery and data calculator for the video production community. With constantly updating battery and codec information on all major camera brands/ models Including; Arri, RED, Sony, Canon, Blackmagic, Nikon, Kinefinity, Fujifilm, Gopro, DJI…. And if your go to camera/ accessory isn’t on there, just drop us a message and we will make sure to add it to the database on the next update (happening at least monthly). - Estimate how long your batteries will last, or how many you'll need for a shoot, whilst also factoring in accessories like your monitor, wireless transmitter and audio. - Determine how much storage space you'll need for a given recording time, including with multicam calculations for interview/ live event setups. - Calculate end of shoot data transfer times between devices. Including HDDs, SSDs and camera specific memory cards. Also factor in the speeds of different connections, including USB and Thunderbolt. "Finally, a dedicated film battery calculator app! It’s easy to use and packed with genuinely handy tools for every filmmaker." -Andi Thompson, DOP "CineTools takes over the headache of trying to calculate data storage and battery runtime. It is particularly useful on temporary set ups where we do not know the equipment combinations that well, such as hired in kit. Basically, it saves a lot of time." - Jack Daly, Filmmaker + Director Current Supported Kit **Cameras** Arri Alexa Mini | Alexa Mini LF | Alexa 35 | Amira BlackMagic Pocket 4K | Pocket 6K | Ursa Mini Pro 12K Canon C300 iii | C500 ii | C70 | R5C DJI DJI Ronin 4D 8K Fujifilm X-H2S GoPro Hero 13 Black Kinefinity Mavo LF | Terra 4K Nikon Z6iii | Z9 | ZR RED Komodo | V-Raptor | V-Raptor XL Sony A7sii | A7Siii | A7iii | A7iv | A9iii | FS7 | FS7ii | FX3 | FX30 | FX6 | FX9 | Venice **Accessories** Monitors Atomos Ninja V 5 | Atomos Shinobi ii | Feelworld F6 Plus | Portkeys PT5 II 5 | SmallHD Cine 5 | SmallHD Cine 7 | SmallHD Cine 7 Ultra | SmallHD 702 Touch | SmallHD 703 UltraBright | TV Logic 056 | TV Logic 058 Wireless Video Hollyland Mars 300 | Hollyland Mars 400s Pro ii | SWIT FLOW2000 | Teradek Bolt 4K 750 | Teradek Bolt 6 LT | Teradek Bolt 6 | Teradek Bolt 4K Max | Vaxis ATOM 600 Focus Systems ARRI UMC4 | ARRI Cforce Mini Motor | ARRI Cforce Plus Mini Motor | ARRI Lcube | Cinetape 1 and 2 | DJI Focus Pro | PDMOVIE Live Air 3 | Tilta Nucleus M Assorted Accesories Audio - Tentacle Sync E | Audio - Zoom F3 • Support • For support, send me an email at [email protected] or message me on Instagram @stevepmann • About • CineTools was developed by Steve Mann, a working DP from the South Coast of the UK. The app was designed to streamline calculations when prepping for shoots, and also on set. Made by the video community for the video community!
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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.
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BUILD KIT DIFFICULTY
Starter
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.
