Comparison

Sun Tracker AR vs hi

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

Head to head
About

Sun Tracker AR

Visualize the sun's path and shadows in augmented reality. Plan for optimal lighting conditions for photography, architecture, gardening, and solar installations. Explore detailed solar data and eclipse information.

Highlights
  • Augmented reality sun path projection
  • 2D and 3D solar path visualization
  • Interactive 3D shadow simulator
  • Solar eclipse mapping and timing
  • Day and night world map
  • Calendar notifications for solar events
  • Home screen widget for sunrise/sunset
Features
Read full description

Know exactly where the sun will be — at any place, on any date. Sun Tracker AR projects the sun's path into the real world through your camera, maps it in 2D and 3D, and simulates the shadows it casts. Built for photographers, architects, house hunters, gardeners, surveyors and solar panel installers — and for anyone who wants to know when the light hits. SOLAR PATH IN AR
 • Augmented reality projection of the sun's position and full daily arc at your location. Point your phone and see where the sun will rise, peak and set. MULTIFUNCTIONAL MAP
 • Detailed 2D and 3D visualisation of the solar path, compass mode and shadow simulator. See at a glance which side of a building gets the most sunlight hours per day. INTERACTIVE 3D SHADOW SIMULATOR
 • Sunny or shaded? Find out! Wondering if your garden, balcony, solar panels, or favorite photo spot will be in the sun or shade? Pick any location, choose a day, and get the answer. • Real buildings, your own objects. Explore 3D shadows cast by real buildings, or add your own trees, cubes, and fences to see how they affect sunlight, all directly on the map. • Explore the day, get the full picture. Slide through the hours to watch sunlight and shadows change, and get a clear report showing exactly when your chosen spot is sunny or shaded. SOLAR ECLIPSE
 Sun Tracker AR gets you ready:
 • Interactive eclipse map with the path of totality and obscuration bands
 • Exact contact times for your location — first contact, totality, maximum, last contact — in your local time zone
 • Duration of totality and maximum obscuration wherever you stand
 • Plus every solar eclipse through 2030, so you can plan the next trip DATA TABLES
 • Complete overview of sun positions, day and night lengths, sunrise and sunset times, golden hour, and astronomical, nautical and civil twilight. Plus solstices, equinoxes and eclipses. DAY & NIGHT MAP
 • Live world map showing the terminator — the moving line between daylight and darkness. CALENDAR NOTIFICATIONS
 • Get notified for the solar events you care about: sunrise, sunset, eclipses. One-time or daily. WIDGET
 • Keep the next sunrise and sunset on your home screen. NO ADS. EVER. • The free version covers your current location and time. Premium unlocks any location, any date, any year — the full planning toolkit.

About

hi

Generate unique AI images directly within your keyboard for any messaging app. Create custom reactions, visuals, or funny pictures instantly without switching apps. Offers privacy-focused image generation and multiple subscription options for credits.

Highlights
  • AI image generation within keyboard
  • Works in any app (iMessage, WhatsApp, etc.)
  • 4 unique images per generation
  • Fast generation for real-time use
  • Private by default, no accounts needed
  • GDPR-compliant and EU-hosted
Features
Read full description

hi-key is a keyboard that generates AI images from your prompts. Type a prompt, tap generate, get 4 AI-made pictures in seconds. Copy and paste straight into iMessage, WhatsApp, or any app you're already in. A reaction GIF that doesn't exist yet. A wild idea you can't unsee. Maybe a quick visual to make a friend laugh. hi-key keeps the conversation moving. No app-switching, no exporting, no friction. Works in any app. iMessage, WhatsApp, Instagram, Telegram, Slack, email. hi-key is a system keyboard, available everywhere you type. WHY HI-KEY • Lives inside any keyboard input, in any app • 4 unique images per generation • Super quick generation to send in the moment. Pick one and keep going. • Private by default. Νo accounts, no passwords. hi-key only processes your prompts and generates your images, that's it. CREDITS & SUBSCRIPTIONS Renewing and one-off options starting at less than a dollar. • Starter: 100 credits/week • Plus: 200 credits/week • Super: 3-day free trial with 200 credits, then 300 credits/week • Top up anytime with consumable credit packs PRIVACY hi-key is private by design. The strongest privacy is the data we never keep. • No accounts, no emails, no passwords. An anonymous ID is the only "you" hi-key knows. • Prompts and generated images are deleted within an hour. We don't train models, build profiles, or sell anything to anyone. • Built and hosted in the EU. GDPR-compliant by default. • Three layers of content moderation keep the keyboard safe to use in any conversation. SUBSCRIPTION TERMS Subscriptions auto-renew weekly at the price shown until canceled. Payment is charged to your Apple ID at confirmation of purchase. Cancel anytime in your Apple ID Account Settings, at least 24 hours before the period ends to avoid the next charge. Any unused portion of a free trial is forfeited when you start a paid subscription. Privacy: https://hi-key.ai/privacy Terms: https://hi-key.ai/terms

Screenshots

Sun Tracker AR4 screens
hi4 screens

Verdict

The call

The clearest difference is ratings volume: Sun Tracker AR at 1.1K against hi's 1. hi's advantage is rating (5.0 vs 4.8). On price, ads, in-app purchases and monetization model 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. Sun Tracker AR sells 1 one-off in-app purchase and hi sells 5 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

hi holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Sun Tracker AR has 1.1K ratings behind it against 1, so its average is the more settled of the two.

Scorecard2 real differences · 8 level
Sun Tracker AR versus hi: the parameters behind the verdict, then further details
ParameterSun Tracker ARhi
PriceFreeFree
Rating4.8 (1.1K ratings)5.0 (1 ratings) — better
Positive reviews76.3% of reviews—
Number of ratings1.1K — better1
Update frequencyEvery 10 days—
AdsNoNo
In-app purchasesYesYes
MonetizationFreemiumFree with in-app purchases
DevicesiPhone, iPad — betteriPhone
Requires iOS26.126.0 — better
Further details — not scored
Size43 MB40 MB
Age rating4+12+
DeveloperZuzana EskinasiZafeirios Malafouris

Bugs and requests

Sun Tracker AR

Reported bugs

3 issues
  • App freezing and crashing
  • Outdated imagery not matching reality
  • Inconsistent performance across devices

Requested features

3 requests
  • More intuitive UI and onboarding
  • Offline mode support
  • Ability to manually adjust location

hi

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Sun Tracker AR

One-time1
  • Premium$11.99
5 purchases

hi

Subscriptions3
  • Starter$0.997 Days
  • Plus$1.997 Days
  • Super3 Days trial$2.497 Days
One-time2
  • Mini pack$0.99
  • Mega pack$4.99

Questions

Is Sun Tracker AR free?
Sun Tracker AR is free to download, with in-app purchases available.
Is hi free?
hi is free to download, with in-app purchases available.
Which has better reviews, Sun Tracker AR or hi?
hi is rated higher. Sun Tracker AR averages 4.8 out of 5 from 1.1K ratings, while hi averages 5.0 from 1 ratings.
Do Sun Tracker AR or hi have ads?
Neither Sun Tracker AR nor hi shows ads.

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