# ODE Solver vs Implicit Differentiation Cal

The clearest difference is price: Implicit Differentiation Cal at Free against ODE Solver's $2.99. On update cadence, ads, in-app purchases and device support there is nothing between them.

Implicit Differentiation Cal is free to download; ODE Solver costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ODE Solver ships an update every 8 months, Implicit Differentiation Cal every 9 months. The most recent releases landed on September 17, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | ODE Solver | Implicit Differentiation Cal |
| --- | --- | --- |
| Price | $2.99 | **Free** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 8 months** | Every 9 months |
| Size | 4 MB | 24 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DRH YAZILIM VE MUHENDISLIK HIZMETLERI LTD STI](https://appshunter.io/developer/914295588) | [Ahmad Sattar](https://appshunter.io/developer/1458483953) |

## What reviewers say

### ODE Solver

[App page](https://appshunter.io/ios/app/ode-solver/id982923512)

**Features:** macOS Compatibility, 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 ODE Solver free?

ODE Solver costs $2.99, with no in-app purchases.

### Is Implicit Differentiation Cal free?

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

### Do ODE Solver or Implicit Differentiation Cal have ads?

Neither ODE Solver nor Implicit Differentiation Cal shows ads.

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

ODE Solver ships an update every 8 months, and Implicit Differentiation Cal every 9 months. Most recently, ODE Solver was updated on September 17, 2026 and Implicit Differentiation Cal on September 18, 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.*