Comparison

Gem, Stone, & Rock Identifier vs Space Arc

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Gem, Stone, & Rock Identifier

Features
Read full description

Easily identify any rock, gem, or crystal—just by taking a photo. Whether you're exploring outdoors, visiting a museum, or curious about a stone in your collection, Gem, Stone, & Rock Identifier makes it easy. Simply snap or upload a photo, and let the AI instantly identify the type of rock or mineral you're looking at. Get quick, reliable information including the rock’s name, type, and basic facts like hardness, origin, and common uses. Want to go deeper? Chat with the app to ask questions and learn more about the formation, metaphysical properties, or how to tell real from fake. Simple, accurate, and beginner-friendly. Key Features: -Take or upload a photo to identify any rock, gem, or crystal -AI-powered recognition with fast and accurate results -Basic facts about each item, including name, type, and origin -Chat with the app to ask follow-up questions and learn more Discover the hidden stories in every stone. Download Gem, Stone, & Rock Identifier today! Subscription Terms: - Payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renewal has been turned off at least 24 hours before the end of the current period. - Account will be charged for renewal within 24 hours prior to the end of the current period, and the cost of the renewal will be determined. - Any unused portion of the free trial period, if any, will be terminated when the user purchases a subscription where applicable. - The user can manage subscriptions and turn off auto-renewal by going to the settings of their device in the subscription section. Privacy: https://blackcigarapps.com/rockidentifier/privacy.html Terms: https://blackcigarapps.com/rockidentifier/terms.html

About

Space Arc

Explore celestial events with real-time data from NASA and other space agencies. Track satellites, view stunning astronomy pictures, and get personalized alerts for meteor showers, eclipses, and aurora.

Highlights
  • Real-time satellite tracking
  • NASA Picture of the Day
  • Global launch calendar
  • Celestial events calendar
  • Aurora alerts
  • Smart notifications
  • Offline event caching
Features
Read full description

Space Arc tells you what's worth stepping outside for tonight — when to go, where to look, and whether the clouds will cooperate. Meteor showers, planets, the ISS, Starlink trains, eclipses, the aurora, full Moons and rocket launches, all worked out for your exact location, with a weather-based Sky Score so you only head out when it's worth it. TONIGHT'S PLAN A simple timeline for tonight: sunset, full darkness, moonrise and moonset, each planet at its best, and every event you can actually see. A "Now" marker shows what's up right now. FIND IT IN THE SKY • AR Sky Finder — hold up your phone and follow the arrow until the target is in the circle. Works for planets, the Moon, meteor-shower radiants and satellites. • Where Do I Look? — a compass guide with the direction and height above the horizon. • Live Track — follow the International Space Station in real time, with a countdown to its next visible pass. EVENTS THAT FIT YOUR NIGHT • Meteor showers — the best hours of the peak night where you are, with realistic hourly rates that account for the radiant's height, twilight and moonlight. • Planets — oppositions, the best evenings and mornings for Mercury and Venus, and a live "Tonight's Sky" card with rise and set times. • Moon — full Moons, supermoons, blue moons and moonless Dark Sky Windows. • Eclipses — whether you'll see each solar and lunar eclipse from your location, and how much of the Sun will be covered. • Satellites — ISS flyovers, Hubble and Tiangong passes, and "Starlink trains" right after launches. • Aurora — NOAA geomagnetic storm alerts, shown only when it's dark and the storm can reach your latitude. • Space weather, rocket launches and near-Earth asteroid flybys. KNOW BEFORE YOU GO • Sky Score — Apple Weather cloud forecasts for the clearest dark hour of each viewing window. • Clear-sky alerts — one optional heads-up before sunset when something special is up and the forecast looks clear. • Reminders and Calendar — get notified before an event or add it to your calendar. Reminders update automatically if a launch is rescheduled. • Home Screen widget — tonight's best event and its Sky Score at a glance. YOUR OBSERVING LOG Tap "I saw it" to save sightings with notes and photos. Earn badges like Meteor Hunter, Station Spotter and Planet Collector, keep a weekly streak, and share good-looking cards of what you saw. EVERY DAY NASA's Astronomy Picture of the Day and the latest image from the Hubble Space Telescope. ACCURATE AND PRIVATE Sky positions, twilight, Moon phases, planet events, meteor peaks and satellite orbits are calculated on your phone using established astronomical methods and NASA/NORAD orbital data. Your observing log and photos stay on your device. Data from NASA (APOD, DONKI, NeoWs, JPL Horizons), NOAA Space Weather Prediction Center, Launch Library 2, CelesTrak, N2YO, ESA/Hubble and Apple Weather.

Screenshots

Gem, Stone, & Rock Identifier4 screens
Space Arc4 screens

Verdict

The call

The clearest difference is in-app purchases: Space Arc at none against Gem, Stone, & Rock Identifier's 2. Gem, Stone, & Rock Identifier's advantage is ads (none vs shown). On price, device support and iOS requirement 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Gem, Stone, & Rock Identifier sells 2 in-app purchases, starting at $2.99 per 7 days. Space Arc asks for nothing beyond the download.

Scorecard2 real differences · 7 level
Gem, Stone, & Rock Identifier versus Space Arc: the parameters behind the verdict, then further details
ParameterGem, Stone, & Rock IdentifierSpace Arc
PriceFreeFree
Rating—5.0 (3 ratings) — better
Number of ratings—3 — better
Update frequency—Monthly
AdsNo — betterYes
In-app purchasesYesNo — better
Monetization—Ad-supported
DevicesiPhone, iPad — betteriPhone
Requires iOS17.5 — better18.6
Further details — not scored
Size2 MB8 MB
Age rating4+4+
DeveloperBlack Cigar Apps, LLCMarc L. Melcher

In-app purchases

2 purchases

Gem, Stone, & Rock Identifier

Subscriptions2
  • Weekly Subscription3 Days trial$2.997 Days
  • Premium Features$9.991 Year
None

Space Arc

No in-app purchases

Questions

Is Gem, Stone, & Rock Identifier free?
Gem, Stone, & Rock Identifier is free to download, with in-app purchases available.
Is Space Arc free?
Space Arc is free to download, with no in-app purchases.
Do Gem, Stone, & Rock Identifier or Space Arc have ads?
Space Arc shows ads; Gem, Stone, & Rock Identifier does not.

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