# Underground Lab US vs Solara

The clearest difference is in-app purchases: Underground Lab US at none against Solara's 4. Underground Lab US also leads on device support (3 vs 1) and iOS requirement (15 vs 17.0). Solara's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. Solara sells 4 in-app purchases, starting at $4.99 per month. Underground Lab US asks for nothing beyond the download.

## The numbers

| Metric | Underground Lab US | Solara |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/solara-pain-forecast/id6802366596/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | — | Every 5 days |
| Monetization | — | Freemium |
| Size | 92 MB | 37 MB |
| Requires iOS | **15** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [PushPress, Inc.](https://appshunter.io/developer/688595778) | [Vitali Mikhailouski](https://appshunter.io/developer/1581915124) |

## What reviewers say

### Underground Lab US

[App page](https://appshunter.io/ios/app/underground-lab-us/id6762464252)

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

**In-app purchases:** none


### Solara

[App page](https://appshunter.io/ios/app/solara-pain-forecast/id6802366596)

Predicts weather-related pain like headaches and joint aches the evening before. Log your symptoms to identify personal triggers and plan your week around potential discomfort.

**Highlights:** Pain risk forecast, Evening weather warnings, Personal trigger logging, 7-day outlook, Hourly weather data, Space weather data, Apple Health integration

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Solara Plus Monthly | $4.99 | per month |
| Solara Plus Weekly | $6.99 | per 7 days |
| Solara Plus Yearly | $49.99 | per year |
| Solara Plus Lifetime | $129.99 | one-time |


## Frequently asked questions

### Is Underground Lab US free?

Underground Lab US is free to download, with no in-app purchases.

### Is Solara free?

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

### Do Underground Lab US or Solara have ads?

Underground Lab US shows ads; Solara does not.

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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.*