# Simplex by SMS vs FourStage

The clearest difference is iOS requirement: FourStage at 13.0 against Simplex by SMS's 16.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Simplex by SMS ships an update every 3 months, FourStage every 4 months. The most recent releases landed on June 1, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | Simplex by SMS | FourStage |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/simplex-by-sms/id6450359480/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | — |
| Size | 347 MB | 149 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Simplex Marketing System LLC](https://appshunter.io/developer/1692911351) | [Vertical Axion, LLC](https://appshunter.io/developer/1697138155) |

## What reviewers say

### 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


### FourStage

[App page](https://appshunter.io/ios/app/fourstage/id6451203518)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Simplex by SMS free?

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

### Is FourStage free?

FourStage is free to download, with no in-app purchases.

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

Neither Simplex by SMS nor FourStage shows ads.

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

Simplex by SMS ships an update every 3 months, and FourStage every 4 months. Most recently, Simplex by SMS was updated on June 1, 2026 and FourStage on September 18, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*