Starlight Clock vs Astro Conditions
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Starlight Clock
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This is a digital and analog clock application with a starry sky motif. The constellation changes every hour. You can also set events in which locomotives appear at 10, 15, 20, 30, and 60 minute intervals. Sometimes shooting stars also stream. ***** The time text, analog clock, and constellations can be moved with the fingers. The analog clock and constellations can be zoomed in and out with two fingers. Seconds can also be displayed. Touching the time character switches to setting mode. The date and time can be changed to various formats by touching it in the setting mode. The display can be switched between 12-hour and 24-hour formats. Screen rotation in portrait and landscape orientation is also supported. By pressing buttons such as "2X" and "3X," the font size can be adjusted in steps. You can choose from 24 different constellations. The order of the constellations can be set to change randomly as well as in a predetermined order. The time signal can be set to one of 79 different tones.
Astro Conditions
This app provides astronomy enthusiasts with real-time viewing conditions, astronomical data, and smart recommendations for telescope and visual observing. It offers hourly cloud cover forecasts, visibility conditions, and a night quality score to plan the perfect night under the stars.
- Hourly cloud cover forecasts
- Real-time visibility conditions
- Night Quality assessment score
- Sunrise, sunset, and twilight times
- Moon phase and illumination
- ISS pass predictions
- BestSpot viewing location recommendations
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Astro Conditions — Know when, where, and what to observe. Plan better nights under the stars. Astro Conditions combines stargazing weather, darkness, Moon conditions, modeled light pollution, nearby observing locations, equipment guidance, and recommended celestial targets in one private, ad-free app. See whether tonight is worth going out, find a better place to observe, and discover what will be visible—from planets and double stars to clusters, nebulae, and galaxies. • Observing Quality and Night Conditions scores from 0 to 100 • Offline modeled light pollution for more location-aware planning • Best Targets for your location, night, and equipment • Nearby areas ranked for better observing conditions • No account, subscription, or advertising NIGHT CONDITIONS & OBSERVING QUALITY Night Conditions combines clouds, seeing, transparency, fog risk, wind, moonlight, and the useful nighttime window. Observing Quality builds on those conditions and accounts for modeled light pollution when available, giving you a more realistic picture of your selected location. • Early- and late-night trends • Three-day forecast • Hourly clouds, visibility, humidity, wind, and temperature • Seeing estimates using temperature stability and upper-atmosphere wind • Transparency estimates using cloud layers and visibility BEST TARGETS Explore recommended objects from a curated catalog for your selected location and night. Add binoculars, visual telescopes, or Smart/EAA telescopes, then choose what you plan to use. You can also choose Naked Eye. • See how well each target matches your equipment • Find the best observing time, direction, and altitude • Understand how weather, darkness, moonlight, and visibility affect the view • Get Finding Tips, equipment guidance, and Observing Notes • Browse offline reference images for many targets • Choose from Easy, Standard, and Challenge observations MY EQUIPMENT • Save binoculars, visual telescopes, and Smart/EAA telescopes • Select one or more instruments for each session FIELD MODE Use a dim red appearance at the telescope to help preserve night vision. SUN, MOON & DARKNESS • Sunrise and sunset • Astronomical night timing • Moonrise and moonset • Moon phase, illumination, and altitude • Moonlight-aware target recommendations BEST NEARBY AREA • Compare nearby areas using forecast conditions and modeled light pollution • See ranked observing locations on a map • Adjust search radius and location spacing • Open a selected location in Apple Maps LOCATION MANAGEMENT • Use your current position or save favorite observing sites • Search by city, coordinates, or map • Rename and reorder saved locations • See modeled light-pollution category and sky brightness for saved sites • Use each location’s local date and time OPTIONAL ISS TRACKING Add your N2YO API key to see visible International Space Station passes. • View rise, peak, and set times • See peak elevation and direction • Follow the ISS path across the sky • Identify passes already in progress WIDGETS & APPLE WATCH • Tonight at a Glance widget for quick condition checks • Tonight’s Targets widget with up to three recommendations • Three-Night Outlook widget for planning ahead • Apple Watch app and complications for quick condition checks • Observing Quality across supported phone, widget, and Watch views • Sync locations, preferences, and conditions with Apple Watch PRIVATE & CUSTOMIZABLE • Layouts adapt to larger iOS text sizes • No account, subscription, or advertising • Modeled sky brightness from David Lorenz’s Light Pollution Atlas • Astronomical calculations and target recommendations performed on your device Whether you observe with your eyes, binoculars, a telescope, Smart/EAA gear, or an astrophotography setup, Astro Conditions helps you decide when to go outside, where to observe, what to look for, and which equipment to use.
Screenshots
Verdict
The clearest difference is in-app purchases: Astro Conditions at none against Starlight Clock's 1. Astro Conditions also leads on ads (none vs shown) and update cadence (weekly vs every 3 months). Starlight Clock's advantage is iOS requirement (14.0 vs 18.0). On price and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Starlight Clock sells 1 one-off in-app purchase. Astro Conditions asks for nothing beyond the download.
Starlight Clock ships an update every 3 months, Astro Conditions weekly. The most recent releases landed on October 24, 2026 and October 6, 2026 respectively.
| Parameter | Starlight Clock | Astro Conditions |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (2 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 2 — better |
| Update frequency | Every 3 months | Weekly — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 14 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Mihoko Araki | Gaston Dombiak |
In-app purchases
Starlight Clock
- Starlight Clock with no ads$2.99
Astro Conditions
No in-app purchases
Questions
Is Starlight Clock free?
Is Astro Conditions free?
Do Starlight Clock or Astro Conditions have ads?
Which is updated more often, Starlight Clock or Astro Conditions?
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