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.
LExp or Long Exposure Calculators is a must-have app for any landscape photographer who is shooting with ND filters or with long exposures or at night
$3.99 · 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 LExp - Long Exposure Calcs: 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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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 advanced features for experienced photographers
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app purchases are not well explained
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: UI may feel outdated compared to competitors
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of community features for sharing experiences
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.
LExp or Long Exposure Calculators is a must-have app for any landscape photographer who is shooting with ND filters or with long exposures or at night. All important calculators, reference tables and cheat sheets in one place. Select your shooting parameters and the app will do the rest for you! CALCULATORS: • Magic Hours for Current Location - sunrises, sunsets, twilights, golden and blue hours, and moon phases and times. • Sunrise, sunset and sun direction for any day at any location. Instantly see how sunrise and sunset positions change throughout the year. Civil, nautical, astronomical twilight times. Elevation and azimuth of the Sun. Shadow ratio. • Stacking ND Filters: Need to stuck multiple ND filters? It's really easy now. • Graduated ND Filters: Not sure what Grad ND filter to use? Simply measure exposure for the sky and for the foreground and get the right answer. • Moonlight/Nightscapes: Helps you get the right exposure for landscape photography under moonlight. • Moon Photography: Calculates right exposure for the Moon under different conditions and focal length. • Star-trails: Want to capture beautiful start trails? Get the right number of shots for stacking them later. • Milky Way/non-moving stars: Helps you capturing beautiful Milky Way galaxy and starry sky without star trails. • Velvia 50: Still shooting film and worries about reciprocity failure? This calculator is for you. • Recalculate Exposure: From one set of ISO, aperture and shutter speed to a different set ISO, aperture and shutter speed. • Aurora Borealis Photography: Calculates the right exposure for shooting Aurora Borealis/Australis. • Shutter Speed Calculator for Solar Eclipses. Calculate shutter speed for different phases of solar eclipse with and without ND filters. • Shutter Speed Calculator for Lunar Eclipses. Calculate shutter speed for different phases of lunar eclipse. REFERENCE TABLES: • Neutral Density ND Filters Reference Charts / Cheat Sheets • Shooting Flowing Water Reference Charts / Cheat Sheets • Shooting Fireworks Reference Charts / Cheat Sheets • How to locate North and South Celestial Poles • Useful resources and links on low-light and night photography FEATURES: • Built-in Timer. Some calculators have built-in timer for your convenience. It is automatically enabled when your exposure is 30 seconds or more. • Alarm in Timer: You will be notified at 20, 10, 5 and 0 seconds when you are using countdown/timer. • Favourite Calculator: Lock your favourite screen for quick access when you opening the application. • Additional Info: Almost every calculator has some additional information about filters, used formulas, techniques etc. If a calculator is just a table than additional info is located below the table. NOTES: • Maps require data connection. • Please ensure that Compass in the System Settings on your device is switched ON. The app will work more accurately with it. • The Compass accuracy can be affected by magnetic or other environmental interferences. LIMITATIONS OF LITE VERSION: • Only reference tables, cheat sheets and useful recourses are available. • No timers. SUPPORT: This application has been built by a photographer for photographers. Please don't hesitate to contact me if you found a bug or have a suggestion. Your feedback is very important!
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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.