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
Peptide Calculator: PepCalc
Master your peptide protocols with Peptide Calculator: PepCalc, the essential tool for accurate dosage and reconstitution
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.6
317 ratings · Top 15%
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 included14 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Peptide Calculator: PepCalc: map the core Medical 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
Introduce additional features like peptide modification options.
Assumption to check: Limited functionality for advanced calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a guided onboarding process to help users understand functionalities.
Assumption to check: Interface can be confusing for new users
Validate with people who use this workflow before building.
Hypothesis 3
Add features to export results to PDF or CSV.
Assumption to check: Lack of data export options
Validate with people who use this workflow before building.
Hypothesis 4
Implement sharing options for results via social media or email.
Assumption to check: No sharing capabilities for results
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
Master your peptide protocols with Peptide Calculator: PepCalc, the essential tool for accurate dosage and reconstitution. Stop the guesswork, avoid costly errors, and dose with confidence every time. Tired of confusing math, online calculators with ads, or complex spreadsheets? PepCalc is a dedicated, professional-grade calculator designed for one purpose: to give you fast and accurate results for your peptide mixing and injection needs. Whether you are in a lab or managing your own wellness, this is the simple, reliable tool you've been waiting for. KEY FEATURES: • ACCURATE DOSAGE CALCULATOR: Instantly determine the precise injection volume. Simply input your desired dose (in mcg or mg), the total peptide amount in the vial, and the reconstitution volume. PepCalc does the math for you. • EASY RECONSTITUTION CALCULATOR: Take the guesswork out of mixing. Figure out exactly how much BAC water or sterile water you need to add to your peptide vial to achieve your desired concentration for easy dosing. • INSULIN SYRINGE UNIT CONVERSION: Automatically convert your calculated dose from mL into units for any standard U-100 insulin syringe. No more manual conversions or risking an incorrect dose. • SUPPORTS ALL PEPTIDES: Our universal calculator works for any peptide compound. Just enter the details of your vial and desired dose to get an instant calculation. • CLEAN & FOCUSED INTERFACE: No clutter, no ads, no distractions. A simple, intuitive design that lets you get your calculation and get on with your day. Fast, accurate, and always in your pocket.No clutter, no ads, no distractions. A simple, intuitive design that lets you get your calculation and get on with your day. Fast, accurate, and always in your pocket. HOW IT WORKS: For Dosage Calculation: 1. Enter your "Desired Dose" (e.g., 250 mcg). 2. Enter the "Peptide Amount" listed on the vial (e.g., 5 mg). 3. Enter the "Reconstitution Volume" of BAC water you added (e.g., 2 ml). 4. Instantly get your result in both mL and insulin syringe units for a perfect injection. For Reconstitution Calculation: 1. Enter the "Peptide Amount" in your vial. 2. Enter your "Desired Concentration" (e.g., 2 mg/ml). 3. Instantly find out the exact amount of BAC water to use for mixing. WHO IS THIS APP FOR? PepCalc is the perfect peptide calculator for researchers, biohackers, fitness enthusiasts, and anyone using peptides for health and wellness. It's a critical tool for ensuring you are administering an accurate and consistent dose every single time. Stop risking under-dosing or waste. Your journey requires precision. Don't settle for less. Download Peptide Calculator: PepCalc today and bring accuracy and simplicity to your peptide protocols. Privacy Policy: https://www.dzeveckij.studio/apps/peptide-calculator Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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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.
SUGGESTED BUILD STACK
React Native
Expo
React Navigation
Zustand
Axios
React Native Paper
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.
