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
PeptideCalc+ · Dose Calculator
PeptideCalc+ is the precision dose calculator for reconstituted injectables — peptides, GLP-1s, and research compounds
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 PeptideCalc+ · Dose Calculator: map the core Health & Fitness 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
Add validation and error handling for inputs.
Assumption to check: Limited user feedback for calculations
Validate with people who use this workflow before building.
Hypothesis 2
Implement a calculation history feature.
Assumption to check: No history tracking
Validate with people who use this workflow before building.
Hypothesis 3
Introduce a community feature for sharing results.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 4
Expand to support multiple peptide types and calculation methods.
Assumption to check: Single calculation type only
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
PeptideCalc+ is the precision dose calculator for reconstituted injectables — peptides, GLP-1s, and research compounds. Enter your vial details and get an exact draw volume in seconds. One-time purchase · No subscription · No account required RECONSTITUTION CALCULATOR · Enter peptide amount, BAC water volume, and desired dose — see exactly where to draw on your syringe · Works with BPC-157, TB-500, Ipamorelin, CJC-1295, Sermorelin, Tesamorelin, Semaglutide, Tirzepatide, PT-141, Melanotan II, Thymosin Alpha-1, IGF-1, AOD-9604, HGH Fragment 176-191, Epithalon, and more · GLP-1 compounds include Ozempic®, Wegovy®, Mounjaro®, Zepbound®, and Rybelsus® · Blend up to 5 compounds in a single vial with proportional dose math · Supports U-100, U-50, U-40, U-30, and 1–5 mL Luer-Lock syringes · Visual syringe ruler highlights your exact draw line and tick mark PROTOCOLS · Save your dosing setups and reload them in one tap · Each saved protocol shows draw volume, tick label, and total doses per vial · Vial progress bar tracks doses remaining SCHEDULES & REMINDERS · Link dose schedules to any saved protocol · Set frequency: daily, specific days of the week, or every N days · Local push notifications remind you when it's time to dose · Calendar view shows upcoming, taken, skipped, and missed doses at a glance LOGGING & ADHERENCE · Log each dose as taken, skipped, or missed in one tap · Track injection site rotation · Add notes to any entry · Per-schedule adherence stats show your consistency over time STORE / SUPPLIES The Supplies tab links to reconstitution accessories on Amazon — syringes, bacteriostatic water, alcohol swabs, sharps containers, cold storage, and more. This app does not sell peptides or any pharmaceutical compounds. PRIVACY · No account required · All data stored locally on your device — nothing leaves your phone · We collect zero user data ——— IMPORTANT: PeptideCalc+ performs arithmetic only. It does not diagnose, treat, or provide medical advice. Always verify your vial label and syringe markings, and consult a licensed clinician or pharmacist before administering any injectable compound. Ozempic® and Rybelsus® are trademarks of Novo Nordisk. Wegovy® is a trademark of Novo Nordisk. Mounjaro® and Zepbound® are trademarks of Eli Lilly. Not affiliated with or endorsed by any manufacturer.
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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
TypeScript
React Navigation
Formik
Async Storage
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.
