Comparison

CSLB C vs Contractor License Prep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

CSLB C

Prepare for the C-39 Roofing Contractor License Exam with up-to-date materials for 2026. Access an extensive question bank, detailed explanations, and progress tracking to hone your skills. Features include customizable study plans and simulated exam modes for comprehensive preparation.

Highlights
  • Up-to-date for 2026
  • Extensive question bank
  • Detailed explanations
  • Progress tracking
  • Simulated exam mode
  • Customizable study plans
Features
Read full description

Prepare for the C-39 Roofing Contractor License Exam with Our Comprehensive Test Prep Program for 2026! Designed for roofing professionals seeking to obtain their C-39 Roofing Contractor License, our course offers thorough preparation for the exam administered by the Contractors State License Board (CSLB). This essential certification is required in California for anyone performing roofing work, validating your knowledge and skills in roofing practices and ensuring you are ready for success in the contracting industry. Key Features: Up-to-Date for 2026: Our study materials are meticulously updated to align with the latest exam formats and content, ensuring you study with the most current resources available. Extensive Question Bank: Access a wide range of C-39-style questions covering all knowledge areas tested on the exam. These questions simulate the real test experience, helping you familiarize yourself with the format and types of questions you'll encounter. Detailed Explanations: Understand the reasoning behind each answer with comprehensive explanations provided for every question. This ensures you grasp the underlying concepts and enhance your knowledge in roofing. Progress Tracking: Monitor your progress with our intuitive performance tracking feature. Identify your strengths and weaknesses in different subject areas, allowing you to focus your study efforts where they are needed most. Customizable Study Plans: Tailor your study schedule to fit your individual needs. Whether you have a few weeks or several months to prepare, our program adapts to your timeline and helps you stay on track. Simulated Exam Mode: Replicate the actual C-39 exam experience with our timed practice tests. These exams mimic official testing conditions to build your confidence and test-taking skills. Wide Accessibility: Our resources are available online, providing aspiring C-39 candidates access to high-quality study materials regardless of location. User-Friendly Interface: Benefit from a user-friendly and intuitive interface designed for easy navigation and seamless learning. Study on your terms, whenever and wherever you choose. Proven Strategies: Learn and implement effective strategies to maximize your score, including time management techniques and methods for tackling different question types. Continuous Updates: We are committed to providing ongoing updates to reflect any changes in exam content and format, ensuring you always have the most relevant preparation materials. Prepare with confidence and increase your chances of success on the C-39 Roofing Contractor License exam with our comprehensive test prep program. Whether you're a student or a seasoned contractor, our program equips you with the knowledge and skills needed to achieve your goals. Important: This program is not affiliated with, endorsed by, or associated with the CSLB or the C-39 exam, and is an independent resource created to assist individuals in preparing for the certification exam. You can find more information about our Products and Premium subscription here: https://testprep.cc/terms-and-conditions.html https://testprep.cc/privacy-policy.html

About

Contractor License Prep

Prepare for your general contractor license exam with practice questions and specialized calculators. Master bid estimation, lien deadlines, and workers' compensation calculations to improve your first-attempt pass rate.

Highlights
  • Bid Estimator with cost breakdown
  • Lien Deadline Calculator for all major states
  • Bond and Workers Comp Calculator
  • 1,000+ practice questions
  • Detailed explanation for each question
  • Covers business, law, project management, safety, and building codes
Features
Read full description

CONTRACTOR LICENSE PREP: PASS YOUR STATE GENERAL CONTRACTOR EXAM The general contractor license exam combines business and law, construction safety, project management, and building codes in one sitting. Most states have a first-attempt pass rate under 60 percent. Candidates who fail are typically weak in three areas: lien law deadlines, bid and markup math, and workers compensation calculation. This app is built around those three gaps with the professional calculators no other exam prep app offers. BID ESTIMATOR Every licensed contractor builds bids. Knowing bid math is tested on every contractor licensing exam. Enter material costs with waste factors, labor hours and rates, equipment costs, subcontractor amounts, overhead percentage, profit margin, and contingency. Get total bid, cost breakdown by category, markup vs margin analysis, and a formatted bid summary. Save and compare multiple scenarios. The difference between markup and margin alone has failed thousands of exam candidates. This tool teaches you both before exam day. LIEN DEADLINE CALCULATOR Mechanic lien law is one of the most heavily tested and most commonly failed topics on contractor exams. In real life, missing a deadline means permanently losing your right to file. Enter your project start date and state to get every critical deadline: preliminary notice (20 to 60 days depending on state and role), mechanic lien filing (60 to 120 days), lien release and waiver deadlines, and state-specific rules for subcontractors vs prime contractors. Covers all major states: California, Texas, Florida, New York, Illinois, Arizona, Georgia, North Carolina, and Washington. BOND AND WORKERS COMP CALCULATOR Licensing exams test bonding requirements and workers comp premiums. Candidates who cannot calculate a premium from payroll and a classification rate fail these questions consistently. Workers comp: premium equals payroll divided by 100 times classification rate, adjusted by EMR. License bond: required amounts by class, surety vs cash. General liability: per-occurrence vs aggregate limits. 1,000+ PRACTICE QUESTIONS BUSINESS AND LAW (35%): Mechanic lien law, contract law, business structures, workers comp coverage and penalties, bonding types, insurance requirements, employment law, dispute resolution. PROJECT MANAGEMENT (25%): Estimating and bidding, critical path and float, change orders, subcontractor management, project documentation, earned value basics. CONSTRUCTION SAFETY (20%): OSHA regulations, fall protection trigger heights, excavation soil classification and shoring, scaffolding, electrical safety, LOTO, hazard communication. BUILDING CODES AND TRADE KNOWLEDGE (20%): IBC and IRC fundamentals, permit and inspection sequence, plan reading, concrete and framing basics, energy codes. Every question includes a detailed explanation covering why the correct answer is right and why the wrong answers are wrong. FREE: 5 questions per day. Basic bid calculator. 3 lien states. No account required. PASS PROMISE: Complete all questions with 80% or higher average, hold active subscription for 3 months, still do not pass. We extend your access by 4 months at no charge. voltexam.com/pass-promise Not affiliated with any state contractor licensing board, PSI Services, Pearson VUE, or NASCLA. Licensing requirements and lien deadlines vary by state. Not legal or financial advice. Privacy Policy: https://www.voltexam.com/privacy Terms of Service: https://www.voltexam.com/terms

Screenshots

CSLB C4 screens
Contractor License Prep4 screens

Verdict

The call

The clearest difference is update cadence: Contractor License Prep at every 6 weeks against CSLB C's every 5 months. Contractor License Prep also leads on rating (5.0 vs 4.8). CSLB C's advantage is ratings volume (9 vs 3) and iOS requirement (15.1 vs 17.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CSLB C sells 9 in-app purchases, starting at $8.99 per 7 days and Contractor License Prep sells 3 in-app purchases, starting at $9.99 per month. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Contractor License Prep holds the better App Store score, 5.0 against 4.8. Both are backed by a comparable volume of ratings — 9 and 3 respectively.

UpkeepUpdate frequency

CSLB C ships an update every 5 months, Contractor License Prep every 6 weeks. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

Scorecard4 real differences · 5 level
CSLB C versus Contractor License Prep: the parameters behind the verdict, then further details
ParameterCSLB CContractor License Prep
PriceFreeFree
Rating4.8 (9 ratings)5.0 (3 ratings) — better
Number of ratings9 — better3
Update frequencyEvery 5 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPod — betteriPhone
Requires iOS15.1 — better17.0
Further details — not scored
Size53 MB7 MB
Age rating4+4+
DeveloperYAUHEN BAHDANOVICHDeeun Inc.

In-app purchases

9 purchases

CSLB C

Subscriptions9
  • CLSB C-39 Weekly Full Access$8.997 Days
  • C-39 Monthly Full Access3 Days trial$24.991 Month
  • CLSB C-39 Monthly Full Access$24.991 Month
Show 6 more
  • C-39 Quarterly Full Access3 Days trial$55.993 Months
  • C-39 Quarterly Full Access$55.993 Months
  • C-39 Semiannual Full Access$75.996 Months
  • C-39 Semiannual Full Access3 Days trial$79.996 Months
  • C-39 Annual Full Access$109.991 Year
  • C-39 Annual Full Access3 Days trial$119.991 Year
3 purchases

Contractor License Prep

Subscriptions2
  • Monthly Access3 Days trial$9.991 Month
  • Annual Access$24.991 Year
One-time1
  • Contractor License Prep Lifetime$49.99

Questions

Is CSLB C free?
CSLB C is free to download, with in-app purchases available.
Is Contractor License Prep free?
Contractor License Prep is free to download, with in-app purchases available.
Which has better reviews, CSLB C or Contractor License Prep?
Contractor License Prep is rated higher. CSLB C averages 4.8 out of 5 from 9 ratings, while Contractor License Prep averages 5.0 from 3 ratings.
Do CSLB C or Contractor License Prep have ads?
Neither CSLB C nor Contractor License Prep shows ads.
Which is updated more often, CSLB C or Contractor License Prep?
CSLB C ships an update every 5 months, and Contractor License Prep every 6 weeks. Most recently, CSLB C was updated on October 23, 2026 and Contractor License Prep on October 25, 2026.

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