# Arbitrium vs Simplex by SMS

The clearest difference is in-app purchases: Simplex by SMS at none against Arbitrium's 1. Simplex by SMS also leads on update cadence (every 3 months vs every 28 months). Arbitrium's advantage is ratings volume (11 vs 1). On price, rating, ads and device support there is nothing between them.

Both are free to download. Arbitrium sells 1 one-off in-app purchase. Simplex by SMS asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.9 for Arbitrium against 5.0 for Simplex by SMS. That said, the two scores are not equally well evidenced: Arbitrium has 11 ratings behind it against 1, so its average is the more settled of the two.

Arbitrium ships an update every 28 months, Simplex by SMS every 3 months. The most recent releases landed on September 28, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | Arbitrium | Simplex by SMS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (11 ratings)](https://appshunter.io/ios/app/arbitrium/id1369876075/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simplex-by-sms/id6450359480/reviews)** |
| Number of ratings | **11** | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 28 months | **Every 3 months** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 8 MB | 347 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [The Lost Project](https://appshunter.io/developer/380868134) | [Simplex Marketing System](https://appshunter.io/developer/1692911351) |

## What reviewers say

### Arbitrium

[App page](https://appshunter.io/ios/app/arbitrium/id1369876075)

This app assists in making rational decisions by allowing you to define criteria and rate your options. It uses a weighted decision matrix to help you identify the best choice for various life scenarios.

**Highlights:** Define decision criteria, Rate available options, Weighted decision matrix, Identify best choice, Save and manage decisions

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PRO Mode | $0.99 | one-time |


### Simplex by SMS

[App page](https://appshunter.io/ios/app/simplex-by-sms/id6450359480)

This all-in-one platform uses AI to streamline sales and marketing for gym owners. It offers lead generation, automated workflows, reputation management, and a website builder. Seamlessly syncs automated marketing with personal team interaction for a personalized customer experience.

**Highlights:** AI-powered sales and marketing, Lead generation from multiple sources, Automated workflows, Reputation management tool, Website builder, CRM/lead management, 2-way sync with automation

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Arbitrium free?

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

### Is Simplex by SMS free?

Simplex by SMS is free to download, with no in-app purchases.

### Which has better reviews, Arbitrium or Simplex by SMS?

Simplex by SMS is rated higher. Arbitrium averages 4.9 out of 5 from 11 ratings, while Simplex by SMS averages 5.0 from 1 ratings.

### Do Arbitrium or Simplex by SMS have ads?

Neither Arbitrium nor Simplex by SMS shows ads.

### Which is updated more often, Arbitrium or Simplex by SMS?

Arbitrium ships an update every 28 months, and Simplex by SMS every 3 months. Most recently, Arbitrium was updated on September 28, 2026 and Simplex by SMS on September 22, 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.*