App Overview

TimeScroller - timezone helper icon

TimeScroller - timezone helper

Terry Brett · Business

TimeScroller is a multi time zone clock and meeting planner, and allows you to very quickly find a suitable time for an overseas phone call or conference.

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
24 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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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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> SELECT BUILD PLATFORM:

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

// RORK SYSTEM PROMPT
Rork plan preview for TimeScroller - timezone helper: map the core Business 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 search feature with auto-suggestions for easier access.

Assumption to check: Limited timezone options or difficulty in finding specific time zones

Validate with people who use this workflow before building.

Hypothesis 2

Design a cleaner layout with collapsible sections and better space utilization.

Assumption to check: User interface may feel cluttered with too many options

Validate with people who use this workflow before building.

Hypothesis 3

Add clear explanations and visuals for premium features in the settings.

Assumption to check: In-app purchase process may not be clearly communicated

Validate with people who use this workflow before building.

Hypothesis 4

Allow users to rename favorite time zones or set their own color codes.

Assumption to check: Not enough customization for favorite time zones

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

TimeScroller is a multi time zone clock and meeting planner, and allows you to very quickly find a suitable time for an overseas phone call or conference. Initially, the current times for your chosen cities are shown, with color coded icons quickly showing if now is a good time to call. If not, a drag on the "TimeScroller" button will rapidly advance the times to find a more suitable time later in the day. Alternatively, select the cities you wish to communicate between, then tap the "Suggest Time" button for TimeScroller to automatically suggest a time. The display will also update showing just those cities, making the choice of a time even easier. Then once you've chosen a time, a tap on a button create a reminder, a calendar event, or automatically draft an email for you including the times for the proposed call. FEATURES * Visually simple, compact display * Takes into account daylight saving rules where applicable * Configurable to show different colors for different times of the day - for example "green" for normal office hours, "amber" for the evening, etc * Suggest time feature * TimeScroller does not require an internet connection * Built in database includes 20,000+ cities * Information page for city includes the date and time of next daylight savings change as well as sunrise and sunset times

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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
Zustand
React Native Picker
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React Native Reanimated
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.