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.
Paper Calc Office is an easy to use, large key, 4-function calculator tailored for the office environment
$0.99 · 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.
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Combine features and design from your favorite apps.
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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 Paper Calc Office: 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 customization options for users
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No advanced mathematical functions
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: History is not easily searchable
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No support for unit conversions
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.
Paper Calc Office is an easy to use, large key, 4-function calculator tailored for the office environment. Use the powerful paper tape to review numbers you've entered, email, timestamp, put comments on any line, or bring a number from higher in the paper tape down into the current calculation. ================= Selected by MagicSolver for Free App Magic of the day! Selected by AppTurbo for Free "App of the Day" ! ================= Make the keys larger by sliding the LCD display up, or show more paper tape by moving the LCD display down. Two keyboards are included, or, make & save up to three of your own. PaperCalc Office Features: CALCULATOR MODE ================= > Great general purpose office calculator > Oversized +, -, x, /, = keys > 3 display formats . - fixed Point from 2-8 places . - float . - eng (power to the x3) VIRTUAL PAPER TAPE ================== > 250 lines of virtual paper tape > Full-screen view of the paper tape on the right-side scroll page. > Copy numbers or lines to the Apple clipboard > Grab numbers from the tape to use in your current calculation > Add comments to any line > Double tap the calculator's LCD display to clear the paper tape. PRINT & EMAIL ============= > Print (requires iOS4.2 & an AirPrint printer) > Email an exact copy of the paper tape EXTRAS ======= > Move the calculator's LCD display to resize the keyboard. > Create and save custom keyboard layouts to suit your personal needs. > Key click sound (on/off) > Hide rows of keys for extra paper tape space. > Options are easy-to-access in the scroll-to-left view window. > International number formatting (Settings -> General -> International -> Region Format -> select region) Q & A: ===== Q1. How does 'Office' differ from the other PaperCalc calculators? A1. 'Office' has been designed as an easy to use chain calculator with basic math functions. The emphasis is on ease-of-use and an easy-to-follow paper trail of calculations performed. Q2. How do I bring a number from the paper tape into my current calculation? A2. Touch any line of the paper tape and select the number from the menu. Q3. How can I quickly clear the paper tape? A3. Make sure the option to 'Double Tap the LCD to Clear' is ON (see the right-side scroll page). Then just double-tap the LCD display to clear the paper tape (Office Full version only) Q4. How do I use the '%' key? A4. There are two ways to use the % key: 1. Obtain the % of a number: - Press '200 % 5 =' - Answer will be '10' - PaperCalc took 5% of 200. 2. The % of a number is used in the operation on the number: - Press: '200 - 5 % =' - Answer will be '190' - PaperCalc subtracted 5% of 200 from 200 Q5. How do I customize the keyboard layout? A5. Press the large "i" (info) key. Select "Edit Keyboard Layout". Then touch and move keys to change locations. Tap keys to change sizes. Save custom keyboard layouts and rename them for later use. Q6. How do I hide the top row of keys for additional Paper Tape space? A6. Just touch and move the Calculator's LCD display until the keyboard background flashes red. Release the LCD and the keys will remain hidden. PURCHASE DETAILS . Payment will be charged to your iTunes account at confirmation of purchase. . This is a one-time purchase. TERMS AND CONDITIONS Your use of this application is governed by Interlocken Technology's Terms of Use (http://s354819480.onlinehome.us/InterlockenPrivacyPolicy/Interlocken%20Technology%20Privacy%20Policy.pdf) and Privacy Policy (http://s354819480.onlinehome.us/InterlockenPrivacyPolicy/InterlockenTechnologyTermsOfUse.pdf)
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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.