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.
Rolled Paper Calculator PRO won the awards every year.
$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.
First kit free with a verified email
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
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.
JavaScript is required to complete mailbox verification.
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Rolled Paper Calculator Flat: map the core Finance workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Affiliate link: CloneChart may earn a commission at no extra cost
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 functionality for complex calculations.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Poor user reviews regarding usability.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of advanced settings for professionals.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase model can be restrictive.
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.
Rolled Paper Calculator PRO won the awards every year. 2010 the BEST iPhone App by AppBank 2011 Attract attention App at iPhone Magazine 2012 C|NET JAPAN pick it up for good Business APP And This yaer, we try Flar desghn for the PRO version. We want to reinvent the calculator. Roll Paper Calculator is NEXT GENERATION CALCULATOR User's voice for PRO version - Jan 19, 2011 by sfwrtr Nice little calculator that fits the bill - I needed a calculator with a paper tape, and of those I tried this was the best. It is simple and straightforward. It allows me to scroll the tape and to touch earlier entries to enter those into the current calculator. I can even send the resulting tape to an email address. Very nice. Just what I needed! - by Ola*buns - Version 4.7 I really needed this app as I am a bookkeeper and always needing to calculate numbers. Love the fact that I can email the tape to myself. Is it able to tear/cut the tape and start a new tape? => YES, Please push C/AC button over 0.5sec. THIS CALCULATOR make the REVOLUTIONARY EXPERIENCE to REPLACE traditional "M+" to "THE NEW PAPER". AND THIS CALCULATOR is E-MAIL ENABLED as COMMUNICATION CALCULATOR. THIS CALCULATE is useful on this situation: - calculation for the account for many goods on your shopping cart - calculate home finance - calculate small business financial statements - send a result of calculation to your PC or friend, family, company TRY NEW GENERATION CALCULATOR EXPERIENCE. ... by Jezebel Sound - Great app, I love it. ... by GEORGE MIHAIL Very nice, but something is missing. - Very nice application. But what about being able to set yourself, the number of decimal points, that you do need ? => Thank you your very nice comment. I can recognize the needs for decimal point switch on real calculator. I add this function. ....by Jesper Christiansen Now working again, thanks - Miss some instructions in what A CUT 4/5 0 2 etc. means and are meant to be used. => Thank you for bug fix report. And I add description to use currency mode, A CUT 4/5 0 2. Regard. ----- the currency function usage ------ A .... for 1/100 currency, auto 1/100 input and mode "2" 0 .... CUT, 4/5, HIDE under decimal point. 2 .... CUT, 4/5, HIDE under 2nd decimal. F .... Fee decimal, not currency mode. CUT ... cut the number under 0 or 2nd decimal 4/5 .... on below 4, cut the number, on upper 5 up. HIDE .. only hide under 0 or 2nd, but calc mode is "F" ------------------------- ------------------------ Usage1: THE PAPER displays input data and the result , like on the a paper. When you slide down the paper, if you can see the input data and results even if it goes out of screen. Usage2: When you select any data on the paper , it make the data to input data. Usage3: When you push arrow key, you can jump up on the paper, and when you up to top, next you goes down on the paper. Usage4: When you push arrow key at long time, you can move on paper to top or bottom of the paper. Usage5: When you push E-mial button , you can send the immediate data, and when you push button long time, you can send all of data on the paper. Usage6: you can set the data of address , subject , volume of sound and VAT rate (Default 5%). Usage7: you can remove the row, by right swiping and push delete button. Usage8: To go to setup view, please push orange button one seconds. if you want to end usage view , please swipe to left side.
Written user reviews are not shown here. Check current App Store reviews >
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.