# ODE Solver + vs Probability

The clearest difference is rating: ODE Solver + at 4.0 against Probability's 1.0. ODE Solver + also leads on in-app purchases (none vs 1) and ratings volume (4 vs 1). Probability's advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Probability sells 1 one-off in-app purchase. ODE Solver + asks for nothing beyond the download.

ODE Solver + holds the better App Store score, 4.0 against 1.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

ODE Solver + ships an update weekly, Probability every 10 days. The most recent releases landed on November 3, 2026 and November 12, 2026 respectively.

## The numbers

| Metric | ODE Solver + | Probability |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (4 ratings)](https://appshunter.io/ios/app/ode-solver-plus/id1549447510/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969/reviews) |
| Number of ratings | **4** | 1 |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 10 days |
| Monetization | **Ad-supported** | Free with in-app purchases |
| Size | 11 MB | 166 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Takahiko Nakade](https://appshunter.io/developer/1513184888) | [Man Hung Sun](https://appshunter.io/developer/1471605573) |

## What reviewers say

### ODE Solver +

[App page](https://appshunter.io/ios/app/ode-solver-plus/id1549447510)

This utility app calculates ordinary differential equations using the Runge-Kutta method. It offers a step width of 0.01 for its calculations.

**Highlights:** Ordinary differential equation calculation, Runge-Kutta method, Step width 0.01

**In-app purchases:** none


### Probability

[App page](https://appshunter.io/ios/app/probability-easy-and-practical/id1625073969)

Enhance your decision-making skills by learning to assess probabilities with this app. It offers formulas for problem-solving, note-taking capabilities, and interactive tools like dice and coin tosses for practical learning.

**Highlights:** Probability assessment, Decision-making improvement, Problem-solving formulas, Personalized notes, Dice and coin toss simulations

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Upgrade | $0.99 | one-time |


## Frequently asked questions

### Is ODE Solver + free?

ODE Solver + is free to download, with no in-app purchases.

### Is Probability free?

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

### Which has better reviews, ODE Solver + or Probability?

ODE Solver + is rated higher. ODE Solver + averages 4.0 out of 5 from 4 ratings, while Probability averages 1.0 from 1 ratings.

### Do ODE Solver + or Probability have ads?

ODE Solver + shows ads; Probability does not.

### Which is updated more often, ODE Solver + or Probability?

ODE Solver + ships an update weekly, and Probability every 10 days. Most recently, ODE Solver + was updated on November 3, 2026 and Probability on November 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.*