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.
App Overview
Xasteria Plus - Astro Weather
Xasteria Plus is the expanded version of the free Xasteria Weather app
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.9
35 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Xasteria Plus - Astro Weather: 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
Implement a locations list where users can save multiple cities with current temps.
Assumption to check: Limited location support, users can't add multiple locations easily.
Validate with people who use this workflow before building.
Hypothesis 2
Add a push notification feature for severe weather alerts.
Assumption to check: Inconsistent data updates, users may not receive timely updates.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline the design to prioritize essential information and simplify navigation.
Assumption to check: User interface may feel cluttered at times.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce a free trial for astrology features to encourage users to try before they buy.
Assumption to check: No free trial for premium 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
Xasteria Plus is the expanded version of the free Xasteria Weather app. It adds premium forecast sources, an Apple Watch companion app, Home Screen widgets, and more observing tools and features. It also helps fund the 7Timer forecast servers that power the free ASTRO forecast used by Xasteria and observers around the world. If you haven't tried Xasteria yet, the free version is a good place to start. Forecast sources • 7Timer / GFS: worldwide ASTRO forecast covering cloud cover, seeing, transparency, temperature, humidity, rain/snow, instability and wind • Apple Weather: configurable hourly hyperlocal forecast, up to 10 days • MET Norway: ECMWF-based, useful in terrain-heavy regions • OpenWeather: hyper-local real-time conditions at your precise location Apple Watch A companion Watch app lets you check key forecast data without picking up your phone plus a Weather Tonight complication and Smart Stack widget. Home Screen Widgets • Tonight's weather • Satellite passes • Aurora forecast Solar eclipses Find every solar eclipse visible from your location, past or future, and rehearse it in an animated simulator with real-time audio cues calling each stage. The photo tool then runs the camera for you: timed shots through the partial phases, and automatic diamond ring, Baily's beads and bracketed exposures around totality, as stills or video. More Tools • Aurora forecast, with worldwide and local data/maps. • ISS and satellite passes, with simulation, live map tracking and dedicated Tiangong and Hubble views. • Light pollution report and map, with a choice of data sources including an extrapolated World Atlas based on VIIRS 2025 satellite night-light data. • Lunar calendar with Sun/Moon graphs and rise/set/twilight data. • Full Location Manager: online search, offline database, map picking, GPS accuracy, elevation and barometric pressure on supported devices. • Quick access to Clear Outside, Meteoblue, Windy, Astrospheric, Sat24, water vapor imagery and more. Display and usability • Night vision mode: red, green or blue, with dimmer control, switching on manually or automatically at dusk. • Three forecast display modes: icon/graphic, color-stripe, raw text. • Summary icons for Apple Weather and 7Timer, configurable in Settings. • Left panel switchable to icons. • Extended help system. No in-app popups asking for a review, but one on the App Store is always appreciated. For suggestions or feedback: http://astro.ecuadors.net
Written user reviews are not shown here. Check current App Store reviews >
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
axios
expo-location
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.
