App Overview

TimeTree: Shared Calendar icon

TimeTree: Shared Calendar

TimeTree, Inc. · Productivity

App loved by 75 million users worldwide

Free · In-app purchases

PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
4.9
91,429 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 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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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 TimeTree: Shared Calendar: map the core Productivity 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 visual conflict detection feature.

Assumption to check: Difficulty in managing overlapping events

Validate with people who use this workflow before building.

Hypothesis 2

Allow users to set custom reminders and notification sounds.

Assumption to check: Limited notification customization options

Validate with people who use this workflow before building.

Hypothesis 3

Enhance sync reliability with better error handling and user feedback.

Assumption to check: Sync issues with external calendars

Validate with people who use this workflow before building.

Hypothesis 4

Simplify the interface and prioritize essential features.

Assumption to check: Cluttered UI with many 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

App loved by 75 million users worldwide Winner of the "App Store Best of 2015" award! "Connect over time. Grow bonds together." Sharing with TimeTree - Family use Solve time management issues of double-booking with family members. Ideal also for planning to pick up the kids and other errands. Carry the calendar with you and check anytime anywhere! - Work use Plan work shifts of employees - Couple use Perfect for those who have trouble adjusting their time together. See the available slots of both in the calendar and plan out dates! Key Features - Shared Calendar Easy calendar sharing for families, couples, work and other groups. - Notifications and reminders Keep up with new events, updates, and new messages. No need to check the app all the time thanks to notifications! - Sync with a device calendar such as Google Calendar Start immediately by copying or syncing with your device's other calendars. - Shared Albums You can create albums and share photos in each group. - Memo and to-do lists Share notes with other members or use memos for events that have no fixed date yet. - Chat within events “What time?” “Where?” Discuss event details within the events! - Web version Access your calendars also from a web browser. - Photos in the events Post details such as images to events. - Multiple calendars Create different calendars for multiple purposes. - Schedule management Time management app made from the point of view of notebook planner user. - Widgets Check your daily schedule easily from widgets without opening the app. Solve your time management troubles! - Hard to keep up with my partner's schedule Do you ever feel uneasy about whether your partner is aware of your schedule? By sharing a calendar in TimeTree, you don't have to contact and confirm with them every time! - Getting forgetful of various school events and tasks Keep the printouts from school easily accessible in the app and make those deadlines! Try it out as a diary! - Miss out on events of your interest Save artist schedules, movie premieres and other important dates in a calendar and share them with like-minded friends! TimeTree Official Website https://timetreeapp.com/ PC(Web) TimeTree https://timetreeapp.com/signin Facebook https://www.facebook.com/timetreeapp/ Twitter https://twitter.com/timetreeapp Instagram https://www.instagram.com/timetreeapp_friends TikTok https://www.tiktok.com/@timetreeapp User Support email [email protected] Please use TimeTree as a schedule book for the year! We value the opinions of our users. We look forward to hearing your feedback! This app uses the following permissions. You can still use the app even if you do not allow optional permissions. - Required permissions There is none. - Optional permissions Calendar: Display device's calendar in TimeTree. Location information: Improves the accuracy of suggestions when setting a location for an event. Access to photos: Customize profiles and calendars, and when photos are saved to devices. Camera: Set and post images to profiles, calendars, etc. using the camera. Track requests from the app: Display customized advertisement for better experience. Notifications: Receive notifications about updates, calendar events and activity from the app. Microphone: Used for the voice input feature. Speech Recognition: Used for the voice input feature.

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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.

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BUILD KIT DIFFICULTY
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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.