# ODE Solver + vs RLM

The clearest difference is rating: RLM at 5.0 against ODE Solver +'s 4.0. RLM also leads on ads (none vs shown). ODE Solver +'s advantage is in-app purchases (none vs 1) and update cadence (weekly vs every 4 weeks). On price, device support and iOS requirement there is nothing between them.

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

RLM holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 4 and 1 respectively.

ODE Solver + ships an update weekly, RLM every 4 weeks. The most recent releases landed on October 24, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | ODE Solver + | RLM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/ode-solver-plus/id1549447510/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rlm-10cx/id6466089794/reviews)** |
| Number of ratings | **4** | 1 |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Weekly** | Every 4 weeks |
| Monetization | Ad-supported | **Free** |
| Size | 11 MB | 6 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Takahiko Nakade](https://appshunter.io/developer/1513184888) | [R.L.M. Software](https://appshunter.io/developer/289639238) |

## 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


### RLM

[App page](https://appshunter.io/ios/app/rlm-10cx/id6466089794)

This scientific calculator offers a comprehensive suite of tools for finance, business, statistics, and complex scientific calculations. It emulates a classic calculator while leveraging modern iOS device capabilities for ease of use and advanced functions.

**Highlights:** Finance and Business calculations, Date and Time interval calculations, Advanced Statistics and Curve Fitting, Complex Numbers and 3D Vectors, Unit and Currency Conversions, Equation Solver, Programmable functions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $9.99 | one-time |


## Frequently asked questions

### Is ODE Solver + free?

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

### Is RLM free?

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

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

RLM is rated higher. ODE Solver + averages 4.0 out of 5 from 4 ratings, while RLM averages 5.0 from 1 ratings.

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

ODE Solver + shows ads; RLM does not.

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

ODE Solver + ships an update weekly, and RLM every 4 weeks. Most recently, ODE Solver + was updated on October 24, 2026 and RLM on September 30, 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.*