# Aurora vs Implicit Differentiation Cal

The clearest difference is price: Implicit Differentiation Cal at Free against Aurora's $6.99. Implicit Differentiation Cal also leads on iOS requirement (13.0 vs 16.0). Aurora's advantage is update cadence (every 9 days vs every 9 months) and device support (4 vs 2). On ads and in-app purchases there is nothing between them.

Implicit Differentiation Cal is free to download; Aurora costs $6.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Aurora ships an update every 9 days, Implicit Differentiation Cal every 9 months. The most recent releases landed on October 9, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | Aurora | Implicit Differentiation Cal |
| --- | --- | --- |
| Price | $6.99 | **Free** |
| Rating | **[5.0 (9 ratings)](https://appshunter.io/ios/app/aurora-solar-observatory/id1035416322/reviews)** | — |
| Number of ratings | **9** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 9 days** | Every 9 months |
| Monetization | Paid | — |
| Size | 26 MB | 24 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | **iPhone, iPad, Mac, Apple TV** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Real Creations AB](https://appshunter.io/developer/737003045) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### Aurora

[App page](https://appshunter.io/ios/app/aurora-solar-observatory/id1035416322)

Explore the Sun's dynamic activity with real-time data, expert insights, and stunning visuals. Receive notifications for solar eruptions, geomagnetic storms, and aurora predictions. Learn about solar phenomena through engaging content and advanced simulations.

**Highlights:** Real-time solar activity notifications, Expert commentary videos, Stunning NASA SDO images and videos, Space weather forecasts and aurora predictions, Interactive data exploration, Advanced solar storm simulations

**Features:** Vision Pro support

**In-app purchases:** none


### Implicit Differentiation Cal

[App page](https://appshunter.io/ios/app/implicit-differentiation-cal/id1607963477)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Aurora free?

Aurora costs $6.99, with no in-app purchases.

### Is Implicit Differentiation Cal free?

Implicit Differentiation Cal is free to download, with no in-app purchases.

### Do Aurora or Implicit Differentiation Cal have ads?

Neither Aurora nor Implicit Differentiation Cal shows ads.

### Which is updated more often, Aurora or Implicit Differentiation Cal?

Aurora ships an update every 9 days, and Implicit Differentiation Cal every 9 months. Most recently, Aurora was updated on October 9, 2026 and Implicit Differentiation Cal on October 6, 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.*