App Overview

Pure Intervals: Interval Timer icon

Pure Intervals: Interval Timer

Tres Arboles Ltd. · Health & Fitness

Build custom interval timers for every workout style

$2.99 · In-app purchases

PRICE
$2.99
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 included15 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 Pure Intervals: Interval Timer: 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

Allow users to create and save multiple presets for different workouts.

Assumption to check: Limited customization options for intervals

Validate with people who use this workflow before building.

Hypothesis 2

Implement a history feature to track past workouts and performance.

Assumption to check: No history tracking

Validate with people who use this workflow before building.

Hypothesis 3

Add animations and visual cues to indicate current interval state (work/rest).

Assumption to check: Lack of visual feedback during workouts

Validate with people who use this workflow before building.

Hypothesis 4

Introduce social sharing options or community challenges to engage users.

Assumption to check: No social or community features

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

Build custom interval timers for every workout style. Pure Intervals is an interval timer built for HIIT, Tabata, strength training, cardio, and circuit training — or whatever you use a timer for. FEATURES • Simple, distraction-free interface built around the timer • Keeps running when your screen locks or you switch apps • Voice notifications — audible cues announce each interval transition • Alert sounds — tone notifications for interval changes • Save unlimited workout routines — no caps, no restrictions • Create workout Templates or Collections of routines • Peer to peer Workout and Collection sharing • Workout History • Fully offline — no internet connection required • No data collection and no ads, ever • Multilingual — if you are so inclined BUY ONCE. USE FOREVER. Pure Intervals is a one-time purchase. No subscription. No premium tier. No paywall. No features locked behind a recurring fee. Every capability — unlimited saved workouts/collections/templates, background timer, voice notifications, offline use — is included from day one and stays that way. If we add features later, you'll get those too. BUILT FOR EVERY TRAINING STYLE HIIT — Push-rest-push-rest with precise interval control. Program exact work and rest durations down to the second. Whether your HIIT workout is 20 minutes or 45, your interval timer tracks every second. Tabata — Classic 20-second work, 10-second rest cycles with round tracking, or customize any variation. Pure Intervals handles standard Tabata and any modified protocol you prefer. Strength training — Rest timers between sets, work timers for timed lifts, or full circuit sequences. Save your strength training routine once and load it every session. Cardio — Steady-state interval training, tempo intervals, or fartlek-style free segments. Any interval structure, any duration. Circuit training — Chain multiple exercises with separate work, rest, and transition intervals in a single saved routine. Your circuit training timer, built exactly the way you need it. OFFLINE. ALWAYS READY. No internet connection needed. Pure Intervals works anywhere you train: the gym floor, a hotel room, a park, outdoors, a basement. No account to create, no sign-in required, no sync dependency. Build your interval routines once, save them, and load them every session. Unlimited saved workouts. No limits.

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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
Async Storage
React Native Reanimated
TypeScript
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.