App Overview

Southerly icon

Southerly

Terminal Velocity · Weather

Southerly shows your whole weather forecast as one beautiful infographic.

$1.99 · In-app purchases

PRICE
$1.99
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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What's included16 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 Southerly: map the core Weather 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

Leverage multiple data sources for improved accuracy.

Assumption to check: Inaccurate weather predictions

Validate with people who use this workflow before building.

Hypothesis 2

Implement push notifications for severe weather alerts.

Assumption to check: Lack of severe weather alerts

Validate with people who use this workflow before building.

Hypothesis 3

Allow users to switch between metric and imperial units easily.

Assumption to check: Limited customization of units

Validate with people who use this workflow before building.

Hypothesis 4

Add home screen widgets for quick weather access.

Assumption to check: No widget support

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

Southerly shows your whole weather forecast as one beautiful infographic. Instead of scrolling lists of numbers, you read the shape of the coming weather at a glance: time wraps around a radial dial, temperature colours the outer ring, rain blooms from the centre, and wind fans out as fine spokes. Turn the hand to any moment - the next 12 hours, 24 hours or seven days - and the dial answers the questions that matter: will it get warmer this afternoon? When does the rain arrive? Do I need my umbrella? ONE DIAL, THREE TIMESCALES Switch between a 12-hour, 24-hour or 7-day view. Drag the hand to scrub through time and see the exact temperature, wind and conditions for the moment you pick. THE RADIAL WEATHER • Temperature ring: amber for heat, blue for cold - see the day's warmth at a glance. Dangerous UV is flagged right on the ring. • Rain and snow: a blue bloom swells from the centre where precipitation is coming; even light drizzle shows clearly. • Wind: fine spokes grow with the wind, with gust dots marking the difference between breeze and blast. Choose your unit - Beaufort, m/s, km/h, mph or knots. • Day and night: the rim fades light to dark with real sunrise and sunset. • Haptics: scrub the hand and feel the weather - the wind rise, the tide turn - with a firm tick at each midnight. MANY PLACES, ONE SWIPE Save the locations you care about and swipe between them. Add any city by search, or use your current location. Each place keeps its own real time zone, sunrise and sunset. Weather alerts are displayed beneath the dial. GLOWS IN THE DARK Dark Mode turns the dial into a night instrument: a luminous temperature ring, brighter rain, a shining tide line on a charcoal sky. It matches your device theme on first launch. TIDES, BUILT IN An offline tide predictor; harmonic stations worldwide backed by the FES2022 global tide model that fills in most other coastal locations, all computed entirely on your phone with no tide service and no connection needed. Note this is informational only - never rely on it for navigation or safety. We are actively working to improve the tides model for missing locations. TE AO MĀORI & MARAMATAKA Turn on te reo Māori and Aotearoa comes through: iwi place names, days and conditions in te reo, and the maramataka - the Māori lunar calendar. See tonight's moon phase, the season's whetū, the lunar month (including Ruhanui in a Te Tau Toru Nui o Matariki year), and the Tangaroa nights favoured for hunting and gathering. Maramataka can be focused on hunting, fishing, trapping interests. This is a work-in-progress. A STORY, NOT A SPREADSHEET With Apple Intelligence, Southerly writes a short, plain-language summary of your next 24 hours - on device and offline - including underlying detail not shown on the chart. Note that your device needs to be recent enough to support Apple Intelligence. FOR THE NAVIGATORS Turn on Navigation for live heading, altitude and speed at your current position, plus a true-north marker on the dial. It caches weather data for offline use. YOUR UNITS, YOUR WAY Choose °C or °F, millimetres or inches, and any of five wind scales. PRIVATE BY DESIGN Forecasts come from Apple Weather and place search uses Apple's own maps - no third-party data brokers. Tides and the weather summary are computed on your device. There's no account and no sign-in. NO DATA COLLECTION, NO FORGOTTEN SUBSCRIPTIONS This was built for our own use; we have no use or requirement for your data, nothing is collected. As much is possible is processed on-device including global tide and lunar models, and Aotearoa placenames in Māori. ACTIVELY DEVELOPED This was built for our own purposes, particularly learning te reo Māori and the influence of maramataka on predator trapping here in Aotearoa/New Zealand. It's built for the latest iOS and supported back to iOS 18. We don't doubt there are things to be corrected and fixed, especially relating to maramataka, but let us know and we'll do our best.

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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
Axios
React Navigation
React Native Maps
Redux
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.