App Overview

Feevy – Fever Tracker icon

Feevy – Fever Tracker

Daniel Rinser · Medical

Do your children often have a fever? Do you sometimes get confused remembering when exactly it started, how it progressed and what other symptoms occurred? Having trouble explaining the exact course of the fever to th...

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
3.5
31 ratings · Top 50%

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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What's included18 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.

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.

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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> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for Feevy – Fever Tracker: 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

Implement a more intuitive tab navigation system.

Assumption to check: Users find it difficult to navigate between logging and viewing data.

Validate with people who use this workflow before building.

Hypothesis 2

Add more graph types and customization options.

Assumption to check: Limited data visualization options for temperature trends.

Validate with people who use this workflow before building.

Hypothesis 3

Incorporate push notifications for daily logging.

Assumption to check: Lack of reminders for logging temperatures.

Validate with people who use this workflow before building.

Hypothesis 4

Focus on thorough testing and ensure app stability.

Assumption to check: User reviews mention crashes and bugs.

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

Do your children often have a fever? Do you sometimes get confused remembering when exactly it started, how it progressed and what other symptoms occurred? Having trouble explaining the exact course of the fever to the pediatrician? Keep track of body temperatures and medication for your whole family with Feevy. TEMPERATURE, MEDICATION AND NOTES With Feevy you can not only record temperature measurements, but also track medications and enter text notes. This way, you can verify if medication was effective and capture additional information, e.g. regarding the patient’s condition. Be perfectly prepared for your next visit to the doctor! BEAUTIFUL CHARTS Entering data is worthless if you can’t analyze it later. Feevy comes with a beautiful and very detailed interactive chart, which makes it easy to get a quick overview, as well as to analyze temperature curves in more detail. You can freely zoom and pan it to see all the details you need. PRINT AND SHARE YOUR DATA Of course you can also print and export your data. This way you can bring your fever curve with you to the doctor or even send it via e-mail. The PDF contains all measurements, medications and notes, as well as a full-page chart showing the temperature curve. TRACK MULTIPLE PEOPLE Feevy lets you track the fever curves for multiple people. It is perfect for keeping track of your children's conditions and illnesses. To represent your family with some personality, Feevy comes with a set of cute profile icons to choose from. SYNC WITH FAMILY MEMBERS Especially if you use Feevy to track your kids' illnesses, you will appreciate its sync functionality. No matter who measures the temperature or administers medication, both parents will always see the same data on their devices. UNIVERSAL APP Feevy supports both iPhone and iPad, including iPad multitasking (Slide Over and Split View). Use your iPhone while on the go or to quickly enter a new measurement, and use the iPad to have a detailed look at the charts. Feedback is always welcome: [email protected] or via Twitter @feevyapp. IMPORTANT In case of fever and sickness, please always consult your doctor. Using this app to track body temperature and symptoms is not a substitute for a visit to the doctor! OF COURSE YOU CANNOT MEASURE YOUR BODY TEMPERATURE WITH THIS APP! You can only record, visualize and archive the measurements obtained with a fever thermometer.

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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
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BUILD KIT DIFFICULTY
Intermediate

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.