# SolGlow vs Luid

The clearest difference is iOS requirement: SolGlow at 17.2 against Luid's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. SolGlow sells 2 in-app purchases, starting at $9.99 per year and Luid sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

SolGlow ships an update every 10 days, Luid weekly. The most recent releases landed on October 24, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | SolGlow | Luid |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.7 (3 ratings)](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 10 days | **Weekly** |
| Monetization | Freemium | — |
| Size | 10 MB | 5 MB |
| Requires iOS | **17.2** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, Apple Watch |
| Age rating | 12+ | 12+ |
| Developer | [Michael Smith](https://appshunter.io/developer/1893971383) | [Ali Yigit](https://appshunter.io/developer/1896336668) |

## What reviewers say

### SolGlow

[App page](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252)

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:** macOS Compatibility, Family Sharing, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SolGlow Pro Annual | $9.99 | per year |
| SolGlow Pro | $19.99 | one-time |


### Luid

[App page](https://appshunter.io/ios/app/luid/id6777601157)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Luid PRO Monthly | $0.99 | per month |
| Luid PRO Yearly | $1.99 | per year |


## Frequently asked questions

### Is SolGlow free?

SolGlow is free to download, with in-app purchases available.

### Is Luid free?

Luid is free to download, with in-app purchases available.

### Do SolGlow or Luid have ads?

Neither SolGlow nor Luid shows ads.

### Which is updated more often, SolGlow or Luid?

SolGlow ships an update every 10 days, and Luid weekly. Most recently, SolGlow was updated on October 24, 2026 and Luid on October 10, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*