# SolGlow vs BigDose

The clearest difference is in-app purchases: BigDose at none against SolGlow's 2. BigDose also leads on update cadence (every 2 days vs every 9 days). SolGlow's advantage is iOS requirement (17.2 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. SolGlow sells 2 in-app purchases, starting at $9.99 per year. BigDose asks for nothing beyond the download.

SolGlow ships an update every 9 days, BigDose every 2 days. The most recent releases landed on October 10, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | SolGlow | BigDose |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/solglow-vitamin-d-tracker/id6763976252/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 9 days | **Every 2 days** |
| Monetization | Freemium | — |
| Size | 9 MB | 10 MB |
| Requires iOS | **17.2** | 26.0 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Michael Smith](https://appshunter.io/developer/1893971383) | [Grant Perry](https://appshunter.io/developer/1689489185) |

## 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 |


### BigDose

[App page](https://appshunter.io/ios/app/bigdose/id6781472633)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is SolGlow free?

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

### Is BigDose free?

BigDose is free to download, with no in-app purchases.

### Do SolGlow or BigDose have ads?

Neither SolGlow nor BigDose shows ads.

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

SolGlow ships an update every 9 days, and BigDose every 2 days. Most recently, SolGlow was updated on October 10, 2026 and BigDose on October 16, 2026.

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