# Arc vs LucidSky

The clearest difference is iOS requirement: LucidSky at 15.1 against Arc's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. Arc sells 3 in-app purchases, starting at $3.99 per month and LucidSky sells 1 in-app purchase, starting at $9.99 per year. Whichever you choose, the download price is not the number that matters.

Arc ships an update fortnightly, LucidSky every 9 days. The most recent releases landed on October 14, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | Arc | LucidSky |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/lucidsky/id6759828086/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 9 days** |
| Monetization | — | Freemium |
| Size | 43 MB | 77 MB |
| Requires iOS | 17.0 | **15.1** |
| Devices | iPhone, Apple Watch | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Marios Pentelas](https://appshunter.io/developer/1878778586) | [TERRENCE D FRADET](https://appshunter.io/developer/1881009202) |

## What reviewers say

### Arc

[App page](https://appshunter.io/ios/app/arc-meteogram-forecasts/id6759468413)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Meteogram Monthly | $3.99 | per month |
| Yearly Pro | $24.99 | per year |
| Meteogram Yearly | $29.99 | per year |


### LucidSky

[App page](https://appshunter.io/ios/app/lucidsky/id6759828086)

This app offers a transparent weather forecast by showing confidence levels in predictions, unlike traditional apps. It provides detailed meteorological data and multiple model comparisons, allowing users to understand weather uncertainty. It's designed for those who want a deeper insight into weather patterns.

**Highlights:** Honest Mode for forecast confidence, Multi-model weather comparison, Animated precipitation radar, 7-day and extended 14-day forecasts, Air quality index (AQI), No ads or data selling

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| LucidSky Pro | $9.99 | per year |


## Frequently asked questions

### Is Arc free?

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

### Is LucidSky free?

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

### Do Arc or LucidSky have ads?

Neither Arc nor LucidSky shows ads.

### Which is updated more often, Arc or LucidSky?

Arc ships an update fortnightly, and LucidSky every 9 days. Most recently, Arc was updated on October 14, 2026 and LucidSky on October 2, 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.*