# Fluid Mechanics Calc vs ODE Solver +

The clearest difference is rating: Fluid Mechanics Calc at 5.0 against ODE Solver +'s 4.0. Fluid Mechanics Calc also leads on ads (none vs shown) and monetization model (free vs ad-supported). ODE Solver +'s advantage is update cadence (weekly vs every 22 months). On price, ratings volume, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fluid Mechanics Calc holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 3 and 4 respectively.

Fluid Mechanics Calc ships an update every 22 months, ODE Solver + weekly. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Fluid Mechanics Calc | ODE Solver + |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calc/id1404879538/reviews)** | [4.0 (4 ratings)](https://appshunter.io/ios/app/ode-solver-plus/id1549447510/reviews) |
| Number of ratings | 3 | **4** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 22 months | **Weekly** |
| Monetization | **Free** | Ad-supported |
| Size | 108 MB | 11 MB |
| Requires iOS | 15.6 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Takahiko Nakade](https://appshunter.io/developer/1513184888) |

## What reviewers say

### Fluid Mechanics Calc

[App page](https://appshunter.io/ios/app/fluid-mechanics-calc/id1404879538)

This utility app provides a comprehensive calculator for fluid mechanics, civil, and structural engineering parameters. It offers over 130 formulas and 360 calculation methods, supporting seamless unit system switching for analysis, design, and operation of fluid-related systems.

**Highlights:** 130+ fluid mechanics formulas, 360+ calculation methods, Unit system conversion (metric/US), Favorite formula marking, High mathematical precision, Seamless unit switching

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is Fluid Mechanics Calc free?

Fluid Mechanics Calc is free to download, with no in-app purchases.

### Is ODE Solver + free?

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

### Which has better reviews, Fluid Mechanics Calc or ODE Solver +?

Fluid Mechanics Calc is rated higher. Fluid Mechanics Calc averages 5.0 out of 5 from 3 ratings, while ODE Solver + averages 4.0 from 4 ratings.

### Do Fluid Mechanics Calc or ODE Solver + have ads?

ODE Solver + shows ads; Fluid Mechanics Calc does not.

### Which is updated more often, Fluid Mechanics Calc or ODE Solver +?

Fluid Mechanics Calc ships an update every 22 months, and ODE Solver + weekly. Most recently, Fluid Mechanics Calc was updated on October 12, 2026 and ODE Solver + on October 24, 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.*