App Overview

Forge Strength Trainer icon

Forge Strength Trainer

Kevin Gillespie · Health & Fitness

Forge is a strength training, nutrition, and body composition tracker built

$9.99 · In-app purchases

PRICE
$9.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
3 ratings · Top 5%

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 included17 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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Quick prompt

> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for Forge Strength Trainer: 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

Enhance user experience by allowing users to create and save custom workouts.

Assumption to check: Limited workout customization options

Validate with people who use this workflow before building.

Hypothesis 2

Integrate social sharing and challenges to engage users.

Assumption to check: Lack of social features

Validate with people who use this workflow before building.

Hypothesis 3

Add compatibility with devices like Apple Watch for better tracking.

Assumption to check: No integration with popular wearables

Validate with people who use this workflow before building.

Hypothesis 4

Improve nutrition logging with barcode scanning and meal suggestions.

Assumption to check: Basic nutrition tracking

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

Forge is a strength training, nutrition, and body composition tracker built for people who want to log their training without paying a monthly fee, signing up for an account, or handing their data to a server. Everything you log lives in a local database on your phone. There is no cloud. There is no sync. There are no ads, no analytics, and nothing to subscribe to. One purchase. That's it. TRAINING Build custom splits with any number of training days. Log sets with automatic rest timers (1, 3, 5, or custom minutes). Tap any set to see exactly which plates go on the bar, per side — 45, 35, 25, and 15 lb bars, with a warning when a weight isn't loadable with standard plates. Every working set is scored against your previous best with an estimated 1RM, and PRs are flagged on the spot. Warmup ramps fill in with one tap and stay out of your working-set volume. Also includes drop sets, supersets, bodyweight tracking, a catch-up queue for missed sessions, and a session timer that starts on your first completed set — not when you open the app. WEEKLY VOLUME A live count of working sets per muscle group, each with an evidence-based target range. Bars show under-, in-, and over-range at a glance, so you can spot the under-trained area before the week is over. NUTRITION Derives daily calorie and macro targets from body composition using Katch-McArdle BMR or Mifflin-St Jeor formulas. Includes barcode scanner via Open Food Facts, macro calculator, daily macro rings, and 14-day trend charts. BODY Tracks weight, body fat %, lean mass, circumferences (shoulders, waist, arms, chest, quads), week-over-week deltas, and 8-week trend charts with goal progress bars. REST DAYS Rest days aren't blank. Forge offers guided stretch and mobility holds, scoped to the muscle groups you trained in the last few days. APPLE HEALTH (OPTIONAL, READ-ONLY) Pulls duration, average heart rate, and active calories from Apple Watch workouts. ONE-TAP CSV EXPORT Exports measurements, food log, and set history as plain CSV files. WHAT FORGE WILL NEVER DO • Ask you to create an account • Collect your email • Send your data to a server • Show you ads • Charge you a subscription • Track you across apps

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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
Supabase
Zustand
react-native-reanimated
expo-haptics
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.