# SLII® vs AST

The clearest difference is price: SLII® at Free against AST's $289.00. SLII® also leads on update cadence (every 3 weeks vs every 4 months) and iOS requirement (12.4 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

SLII® is free to download; AST costs $289.00 up front. Neither carries in-app purchases, so what you see is what you pay.

SLII® ships an update every 3 weeks, AST every 4 months. The most recent releases landed on September 10, 2026 and September 18, 2026 respectively.

## The numbers

| Metric | SLII® | AST |
| --- | --- | --- |
| Price | **Free** | $289.00 |
| Rating | **[3.3 (28 ratings)](https://appshunter.io/ios/app/slii/id536473591/reviews)** | — |
| Number of ratings | **28** | — |
| Positive reviews | 58.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 4 months |
| Monetization | Free | — |
| Size | 47 MB | 41 MB |
| Requires iOS | **12.4** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [The Ken Blanchard Companies](https://appshunter.io/developer/417829677) | [AST Technology SA](https://appshunter.io/developer/1527859551) |

## What reviewers say

### SLII®

[App page](https://appshunter.io/ios/app/slii/id536473591)

This reference tool helps leaders and team members apply the SLII Model to improve relationships and performance. It provides guidance for critical leadership moments, offering diagnostic tools and actionable tips.

**Highlights:** Diagnosis wizard for development levels, Actionable tips for SLII principles, Interactive SLII Model visualization, On-demand expanded information, Guidance for leadership conversations

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

**In-app purchases:** none


### AST

[App page](https://appshunter.io/ios/app/ast-arc/id1523688092)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SLII® free?

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

### Is AST free?

AST costs $289.00, with no in-app purchases.

### Do SLII® or AST have ads?

Neither SLII® nor AST shows ads.

### Which is updated more often, SLII® or AST?

SLII® ships an update every 3 weeks, and AST every 4 months. Most recently, SLII® was updated on September 10, 2026 and AST 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.*