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.
Whether you're planning a media buy, pitching a client, or sanity-checking a vendor quote, CPM Calc gives you the answers in seconds - with a clean, modern interface designed for the way you actually work.
$1.99 · 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 CPM Calculator: map the core Business 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 features beyond simple calculations
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No way to save historical data
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of user guidance on inputs
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchase confusion
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.
Whether you're planning a media buy, pitching a client, or sanity-checking a vendor quote, CPM Calc gives you the answers in seconds - with a clean, modern interface designed for the way you actually work. THREE CALCULATORS IN ONE • Standard CPM - Enter any two of Cost, CPM, or Impressions and instantly solve for the third. The classic calculator, refined. • CPA (Cost Per Acquisition) - Calculate your true cost per conversion from CPM, click-through rate, and conversion rate. Add impressions to project total conversions for the campaign. • Break-Even - Find the maximum CPM you can afford before losing money. Add an optional Target Margin to bake in a profit cushion and price with confidence. COMPARE SCENARIOS SIDE BY SIDE Stop juggling spreadsheets. Save up to three scenarios (A, B, C), tag each with a channel, and instantly see which one performs best with the BEST badge on the winning option. EVERY CALCULATION, AUTOMATICALLY SAVED The History tab keeps a running log of everything you've calculated. Tag entries by Channel (Display, Social, Video, Programmatic) and Campaign name, then filter to find exactly what you need. CSV EXPORT Send your full history to spreadsheets, reports, or your team with one tap. Perfect for end-of-week wrap-ups or client deliverables. DESIGNED FOR HOW YOU WORK • Color-coded calculator modes for at-a-glance recognition • Subtle haptic feedback confirms every successful calculation • Smart input parsing - paste numbers with $ signs, commas, or spaces and we handle the rest • Keyboard shortcuts for fast field navigation • Built-in Help with formulas, tips, and a glossary • Looks great in Light and Dark mode • Universal layout for iPhone and iPad PRIVATE BY DESIGN CPM Calc runs entirely on your device. No accounts, no tracking, no ads, no data collection. Your calculations are yours. WHO IT'S FOR • Media buyers planning campaigns • Account managers pricing proposals • Performance marketers modeling CPA targets • Publishers and ad ops teams checking rate cards • Anyone who needs to do the math behind digital advertising, fast Download CPM Calc today and stop reaching for a calculator app, a spreadsheet, and a notebook every time someone asks "what's our CPA going to be?"
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.