# CLS Lean Specialist Exam Prep vs US Constitution Guide

The clearest difference is in-app purchases: US Constitution Guide at none against CLS Lean Specialist Exam Prep's 9. US Constitution Guide also leads on update cadence (every 6 weeks vs every 3 months). CLS Lean Specialist Exam Prep's advantage is ads (none vs shown) and iOS requirement (15.1 vs 26.5). On price and device support there is nothing between them.

Both are free to download. CLS Lean Specialist Exam Prep sells 9 in-app purchases, starting at $8.99 per 7 days. US Constitution Guide asks for nothing beyond the download.

CLS Lean Specialist Exam Prep ships an update every 3 months, US Constitution Guide every 6 weeks. Both last shipped on October 24, 2026.

## The numbers

| Metric | CLS Lean Specialist Exam Prep | US Constitution Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/cls-lean-specialist-exam-prep/id6743373867/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 51 MB | 7 MB |
| Requires iOS | **15.1** | 26.5 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Exam Prep OU](https://appshunter.io/developer/1689642184) | [Yeferson Jimenez Sevilla](https://appshunter.io/developer/1889049374) |

## What reviewers say

### CLS Lean Specialist Exam Prep

[App page](https://appshunter.io/ios/app/cls-lean-specialist-exam-prep/id6743373867)

Prepare for your Certified Lean Specialist (CLS) exam with this comprehensive study tool. It offers a vast question bank, detailed explanations, progress tracking, and simulated exams to help you master Lean principles and achieve certification.

**Highlights:** Extensive question bank, Detailed answer explanations, Progress tracking, Customizable study plans, Simulated exam mode, User-friendly interface

**Features:** macOS Compatibility

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| CLS Weekly Full Access | $8.99 | per 7 days |
| CLS Monthly Full Access | $24.99 | per month |
| CLS Monthly Full Access | $24.99 | per month |
| CLS Quarterly Full Access | $55.99 | per 3 months |
| CLS Quarterly Full Access | $55.99 | per 3 months |
| CLS Semiannual Full Access | $75.99 | per 6 months |
| CLS Semiannual Full Access | $75.99 | per 6 months |
| CLS Annual Full Access | $109.99 | per year |
| CLS Annual Full Access | $109.99 | per year |


### US Constitution Guide

[App page](https://appshunter.io/ios/app/us-constitution-guide/id6780650729)

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

**In-app purchases:** none


## Frequently asked questions

### Is CLS Lean Specialist Exam Prep free?

CLS Lean Specialist Exam Prep is free to download, with in-app purchases available.

### Is US Constitution Guide free?

US Constitution Guide is free to download, with no in-app purchases.

### Do CLS Lean Specialist Exam Prep or US Constitution Guide have ads?

US Constitution Guide shows ads; CLS Lean Specialist Exam Prep does not.

### Which is updated more often, CLS Lean Specialist Exam Prep or US Constitution Guide?

CLS Lean Specialist Exam Prep ships an update every 3 months, and US Constitution Guide every 6 weeks. Most recently, CLS Lean Specialist Exam Prep was updated on October 24, 2026 and US Constitution Guide 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.*