Comparison

SolGlow vs Aurnia

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

Head to head
About

SolGlow

This app automatically estimates your daily vitamin D intake based on sunlight exposure, skin type, and location. It provides real-time UV index, burn-safe time remaining, and integrates with Apple Watch for effortless tracking. Features include winter mode, supplement check-ins, and advanced planning tools for Pro users.

Highlights
  • Automatic vitamin D estimation
  • Live UV index and IU-per-minute rate
  • Burn-safe time remaining with alerts
  • Winter Mode for low-sun periods
  • Supplement check-in
  • 7-day UV forecast (Pro)
  • Trip Planner for jet lag (Pro)
Features
Read full description

SolGlow turns your time outside into the number that matters: vitamin D — measured in IU, not just minutes. And it's automatic: your Apple Watch's daylight is credited to your estimate by itself — no logging, no GPS trail — and every number can show the exact math behind it. From your Time in Daylight, skin type, outfit, age, and your location's sun angle, SolGlow estimates the vitamin D you actually made today — and warns you before you burn. SUN TODAY, IN ONE ANSWER (NEW) • When today's vitamin D window opens — the same UV 3+ hours that call for sun protection • Your burn time, and the protection today's UV calls for: SPF, sunglasses, shade • Optional alerts when today's protection hours begin • Live UV index, one daily goal tuned to your life stage, and vitamin-D foods in your units SUN SAFETY THAT KNOWS YOU (NEW, FREE) • Sun Sensitivity: taking a medicine that can increase sun sensitivity? Every burn time gets a cautious margin • Snow, sand or water bounce extra UV at you — tell SolGlow and today's burn math adjusts • Monthly Skin Check: the ABCDE self-exam with a gentle reminder — a habit, never a diagnosis AUTOMATIC, AND YOU CAN SEE WHY (FREE) • True-D: SolGlow corrects the UV Index for ozone — sunburn UV isn't vitamin-D UV — and shows the cited step whenever it changes your number (Kazantzidis 2009) • Learn & Sources: plain-language guides to UV, sunscreen, winter and more, each with its studies • Ask Siri "How much sun did I get in SolGlow?" — plus Best Sun Window widgets for StandBy, Lock Screen, and Home Screen MADE FOR IPHONE DUO Open it and Today spreads into two columns, guides read like a book, and a live session stands up like a scoreboard on the picnic table. OWN THE WINTER • Winter Mode: when your latitude's noon sun can't make vitamin D, SolGlow shows where yours is coming from — and counts down to the sun's return • Free Winter Countdown widget and Apple Watch complication — works offline • Streak Shield: only physics can excuse a missed day • One-tap supplement check-in from a notification, widget, Siri, or your watch BRING YOUR HISTORY (FREE) • Import your Time in Daylight history from Apple Health in one tap — no account • Back up everything to one file and restore on a new phone SUN SESSIONS (PRO) • Direct Sun: a live burn budget that only counts down, and says plainly when to get out • Live Activity on your Lock Screen and Dynamic Island, with a sunscreen reapply timer • Morning Light, editable history, streaks, a shareable weekly recap — and the Apple Watch app PLAN AHEAD (PRO) • 7-day UV forecast with your personal best-sun windows • Annual sun plan and a jet-lag Trip Planner (timing guidance, not medical advice) KNOW YOUR LEVEL (PRO) • 25(OH)D serum estimate with a 12-week projection • Cofactors, supplement guidance, blood-test reminders, and a doctor-ready PDF/CSV report PRIVATE BY DESIGN No account. No sign-up. No analytics. No ads. Your health data, profile, and location history never leave your device — the only network call fetches a UV forecast (coordinates only, no identifier). Optional backup goes to your own iCloud, never to us. FREE TO TRY — THEN PICK YOUR PLAN Every feature free for 14 days. Then choose your SolGlow Pro: $9.99 per year, auto-renewing until you cancel — or Lifetime: one purchase, yours forever, Family Sharing included. The free tier keeps today's tracking and all safety features, always. SolGlow estimates are educational, not medical advice. Always consult your clinician about vitamin D supplementation and blood testing. SolGlow Pro Annual is an auto-renewing subscription: $9.99 per year, charged to your Apple ID at purchase confirmation. It renews unless cancelled at least 24 hours before the period ends. Manage or cancel in your App Store settings. SolGlow Pro Lifetime is a one-time purchase that never renews. Privacy Policy: https://twisteddatastudios.com/privacy.html Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Aurnia

Features
Read full description

Wake up understood. Aurnia reads last night's sleep and suggests what tonight should look like. AI sleep coach + smart alarm + recovery score + sleep stories — built for Apple Watch, works without one. No account needed: your sleep records stay on your iPhone. WHAT'S INCLUDED • Recovery Score (0–100) from your HRV, resting heart rate, sleep duration and efficiency, compared with your own 14-night baseline • A suggested bedtime for tonight • Sleep journal with mood and factor tags (caffeine, alcohol, late meal, exercise, screen time, stress, travel) • Factor correlations — see which habits cost you sleep • Sleep stories and ambient soundscapes • Apple Watch app AURNIA PRO • AI Morning Brief — one paragraph on what last night looked like and why. Requires an account and your permission to send a sleep summary to our AI provider, Anthropic. • Smart Alarm — a daily wake-up alert at the time you choose • The full sleep story library and CSV export PRIVACY Sleep analysis runs on your device. The cloud is used only for the AI Morning Brief, and only after you allow it. You can delete your data in the app at any time. Aurnia Pro is an auto-renewing monthly or annual subscription charged to your Apple ID. It renews unless cancelled at least 24 hours before the end of the period. Manage or cancel in Settings → [your name] → Subscriptions. Aurnia is a wellness companion. It does not diagnose, treat, or cure any sleep disorder. Privacy: https://ootssu.com/aurnia/privacy.html Terms: https://ootssu.com/aurnia/terms.html Support: https://ootssu.com/aurnia/support.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

SolGlow4 screens
Aurnia4 screens

Verdict

The call

SolGlow and Aurnia are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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. SolGlow sells 2 in-app purchases, starting at $9.99 per year and Aurnia sells 2 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

SolGlow ships an update every 10 days, Aurnia weekly. The most recent releases landed on October 31, 2026 and November 9, 2026 respectively.

ScorecardNo meaningful differences
SolGlow versus Aurnia: the parameters behind the verdict, then further details
ParameterSolGlowAurnia
PriceFreeFree
Rating3.7 (3 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings3 — better—
Update frequencyEvery 10 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium—
DevicesiPhone, iPad, Apple Watch — betteriPhone, Apple Watch
Requires iOS17.217.0 — better
Further details — not scored
Size10 MB20 MB
Age rating12+4+
DeveloperMichael SmithJIYULMOM

In-app purchases

2 purchases

SolGlow

Subscriptions1
  • SolGlow Pro Annual$9.991 Year
One-time1
  • SolGlow Pro$29.99
2 purchases

Aurnia

Subscriptions2
  • Aurnia Pro Monthly$6.991 Month
  • Aurnia Pro Annual7 Days trial$39.991 Year

Questions

Is SolGlow free?
SolGlow is free to download, with in-app purchases available.
Is Aurnia free?
Aurnia is free to download, with in-app purchases available.
Do SolGlow or Aurnia have ads?
Neither SolGlow nor Aurnia shows ads.
Which is updated more often, SolGlow or Aurnia?
SolGlow ships an update every 10 days, and Aurnia weekly. Most recently, SolGlow was updated on October 31, 2026 and Aurnia on November 9, 2026.

Other comparisons