Comparison

Project Function vs Sol Glow

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

Head to head
About

Project Function

Features
Read full description

With the Project Function App, you can check in to our facility, manage your membership details, and book appointments. - Access digital membership pass - Book appointments and view session balance - Edit personal information and view membership details - Stay up-to-date with announcements from us! Download the app today! Features connectivity to Apple Watch (synced to HealthKit app)

About

Sol Glow

This app helps you plan safe outdoor sun exposure based on live UV index, weather, and your skin type. It provides personalized session lengths, timers with reminders to flip, reapply sunscreen, and hydrate, all while discouraging overexposure.

Highlights
  • Live UV index and weather forecast
  • Personalized sun exposure session planning
  • Smart timer with flip and reapply reminders
  • Hydration nudges
  • Live Activity and widget support
  • Session logging and progress tracking
  • Group session sharing
Features
Read full description

Built on the live UV index — not guesswork. Sol Glow is a sun-safety-first planner for time outside. It estimates a personalized session length from the live local UV index, the weather, your skin type, and your SPF — then runs a live timer that reminds you when to flip, reapply, and hydrate. The safest amount of UV exposure is none, so every plan is capped to discourage overexposure. Here's how it works. 1. TELL SOL GLOW ABOUT YOU A quick onboarding learns your skin type, sensitivity, and the kind of time outside you're after. You can add your sunscreens, oils, and sprays once, with their SPF and water resistance. 2. CHECK TODAY'S SUN The home screen shows the live UV index, cloud cover, and your burn risk for your location — so you know what you're walking into before you go out. 3. GET A PLAN FOR RIGHT NOW Pick your goal and Sol Glow builds a session length from real-time UV, your skin profile, and the SPF you're wearing. Every plan is capped under a personalized burn-risk threshold to discourage overexposure. 4. RUN THE LIVE TIMER Start your glow and the app counts down to each step: - Flip reminders, front and back - Reapply reminders timed to your sunscreen's SPF and water resistance - Hydration nudges - A clear "wind down" so you don't overdo it 5. GLANCE, DON'T STARE - Live Activity on the Lock Screen and Dynamic Island with your timer, UV, and reapply status - Home Screen widgets for today's UV index - Designed to be glanced at, so you can put the phone away 6. LOG IT Each session saves to a calendar with the UV, SPF, and outcome. Optional progress photos and streaks are yours to keep. Your history feeds back in to refine future plans. 7. GO TOGETHER Start a shared "beach day" session with friends, sync timers, and keep the whole group on the same flip and reapply schedule. SAFETY BY DESIGN - Outdoor sun only — Sol Glow does not support or encourage tanning beds - Plans actively discourage excessive UV exposure - SPF, reapply, and time-limit reminders throughout - Burn-risk awareness front and center GLOW UP SUBSCRIPTION Sol Glow is a subscription app. Glow Up unlocks everything — the full smart planner, the live glow timer, flip, reapply, and hydration reminders, Home Screen widgets, and shared beach-day sessions with friends. New members start with a 3-day free trial: - Glow Up Weekly: $2.99 / week - Glow Up Monthly: $4.99 / month - Glow Up Yearly: $24.99 / year Your 3-day free trial automatically converts to the plan you chose unless you cancel at least 24 hours before it ends. Payment is charged to your Apple ID, and the subscription renews automatically unless canceled at least 24 hours before the end of the current period; manage or cancel anytime in your App Store account settings. No ads. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://getsolglow.com/privacy.html IMPORTANT Sol Glow provides general sun-safety guidance for outdoor sun. It is not medical advice and does not guarantee any tanning result. The safest level of UV exposure is none — always follow your sunscreen's directions, cover up, and seek shade when UV is high. Consult a professional about any skin concerns.

Screenshots

Project Function4 screens
Sol Glow4 screens

Verdict

The call

The clearest difference is update cadence: Sol Glow at every 2 days against Project Function's every 6 weeks. Project Function's advantage is device support (4 vs 1). On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Project Function ships an update every 6 weeks, Sol Glow every 2 days. The most recent releases landed on October 9, 2026 and September 23, 2026 respectively.

Scorecard2 real differences · 8 level
Project Function versus Sol Glow: the parameters behind the verdict, then further details
ParameterProject FunctionSol Glow
PriceFreeFree
Rating—5.0 (3 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—3 — better
Update frequencyEvery 6 weeksEvery 2 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Subscription
DevicesiPhone, iPad, iPod, Apple Watch — betteriPhone
Requires iOS15.5 — better16.4
Further details — not scored
Size181 MB50 MB
Age rating4+4+
DeveloperProject Function LLCSTONEG LLC

In-app purchases

None

Project Function

No in-app purchases

None

Sol Glow

No in-app purchases

Questions

Is Project Function free?
Project Function is free to download, with no in-app purchases.
Is Sol Glow free?
Sol Glow is free to download, with no in-app purchases.
Do Project Function or Sol Glow have ads?
Neither Project Function nor Sol Glow shows ads.
Which is updated more often, Project Function or Sol Glow?
Project Function ships an update every 6 weeks, and Sol Glow every 2 days. Most recently, Project Function was updated on October 9, 2026 and Sol Glow on September 23, 2026.

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