# Dogl Calculus vs Fynix

The clearest difference is in-app purchases: Fynix at none against Dogl Calculus's 3. Fynix also leads on update cadence (every 5 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Dogl Calculus sells 3 one-off in-app purchases. Fynix asks for nothing beyond the download.

Dogl Calculus ships an update every 2 months, Fynix every 5 days. Both last shipped on October 16, 2026.

## The numbers

| Metric | Dogl Calculus | Fynix |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (147 ratings)](https://appshunter.io/ios/app/dogl-calculus/id1554140181/reviews)** | — |
| Number of ratings | **147** | — |
| Positive reviews | 75.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 days** |
| Monetization | Free with in-app purchases | — |
| Size | 39 MB | 21 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Dogl](https://appshunter.io/developer/1554140183) | [Eugenio Castellanos](https://appshunter.io/developer/6802936347) |

## What reviewers say

### Dogl Calculus

[App page](https://appshunter.io/ios/app/dogl-calculus/id1554140181)

Master calculus with this mobile app designed by university professors. It offers bite-sized problem-solving, personalized learning paths, and hints to guide you through challenging concepts. Start with free practice problems and unlock more weekly.

**Highlights:** Bite-sized problem-solving, Personalized learning paths, Weekly free problems, Teacher's Eye™ hints, Ad-free experience, Expert-designed content

**Features:** Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Plan - 1 month | $4.99 | one-time |
| Unlimited Plan - 4 months | $14.99 | one-time |
| Unlimited Plan - 1 year | $24.99 | one-time |


### Fynix

[App page](https://appshunter.io/ios/app/fynix-learn-python/id6802936345)

**In-app purchases:** none


## Frequently asked questions

### Is Dogl Calculus free?

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

### Is Fynix free?

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

### Do Dogl Calculus or Fynix have ads?

Neither Dogl Calculus nor Fynix shows ads.

### Which is updated more often, Dogl Calculus or Fynix?

Dogl Calculus ships an update every 2 months, and Fynix every 5 days. Most recently, Dogl Calculus was updated on October 16, 2026 and Fynix 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.*