# ODE vs CalC

The clearest difference is price: CalC at Free against ODE's $1.99. CalC also leads on update cadence (every 4 days vs monthly). ODE's advantage is in-app purchases (none vs 2). On ads, device support and iOS requirement there is nothing between them.

CalC is free to download; ODE costs $1.99 up front. CalC sells 2 in-app purchases, starting at $1.99 per month. ODE asks for nothing beyond the download.

ODE ships an update monthly, CalC every 4 days. The most recent releases landed on October 11, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | ODE | CalC |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 4 days** |
| Size | 37 MB | 297 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Om Prakash Chapagain](https://appshunter.io/developer/1618620262) | [Le Van Thanh](https://appshunter.io/developer/1835323565) |

## What reviewers say

### ODE

[App page](https://appshunter.io/ios/app/ode-solver-integrator-pro/id1619296409)

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

**In-app purchases:** none


### CalC

[App page](https://appshunter.io/ios/app/calc-scientific-calculator/id6751479006)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium monthly | $1.99 | per month |
| Premium yearly | $19.99 | per year |


## Frequently asked questions

### Is ODE free?

ODE costs $1.99, with no in-app purchases.

### Is CalC free?

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

### Do ODE or CalC have ads?

Neither ODE nor CalC shows ads.

### Which is updated more often, ODE or CalC?

ODE ships an update monthly, and CalC every 4 days. Most recently, ODE was updated on October 11, 2026 and CalC on October 12, 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.*