Comparison

K20 START vs Contractor Exam Prep

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

Head to head
About

K20 START

Experience immersive, gamified tours of colleges and universities using augmented reality. Explore majors, housing, and campus landmarks through interactive videos and 3D maps. Earn badges and learn about college life in a fun, self-guided way.

Highlights
  • Augmented reality campus tours
  • Gamified learning approach
  • 3D campus maps with location tracking
  • Interactive landmark exploration
  • Information on majors and admissions
  • Downloadable school content
Features
Read full description

Explore colleges and universities in this exciting augmented reality app for high school students, parents, and adult learners. START gives you immersive tours of participating colleges and universities through a fun, gamified approach. Simply download the school’s content and experience a self-guided tour of the campus. The app provides a 3D map that displays your current location and indicates notable campus landmarks. As you visit these landmarks, you will view live-action videos, collect items, earn badges, and learn more about college life! EXPLORE • College majors, departments, and programs • Student housing and dining options • Admissions, financial aid, and other resources • Unique landmarks and things to do FEATURES • Self-guided tours • A fun, gamified approach • Engaging dialogue and acting • High-quality videos and 360-degree images START currently includes downloadable content for Cameron University, Southwestern Oklahoma State University (SWOSU), and Eastern Oklahoma State College (EOSC). The University of Oklahoma’s K20 Center is a statewide educational research center located in Norman, Oklahoma. The K20 Center collaborates with educators to research and develop innovative learning methods. K20 also offers a Digital Game-Based Learning program to promote higher-order thinking and problem-solving.

About

Contractor Exam Prep

Prepare for your contractor license exam with a comprehensive quiz app. It covers the International Building Code with over 600 multiple-choice questions, many referencing the code book. An audio player allows for learning on the go.

Highlights
  • Over 600 multiple-choice questions
  • References to the IBC code book
  • Selectable chapters for focused study
  • Audio player for questions and answers
  • Option to ignore OSHA questions
Features
Read full description

Written by a licensed general contractor who used these exact questions to pass his own state exam. Nearly 600 multiple-choice questions organized by International Building Code chapter, plus OSHA and general construction questions. Most questions cite the code section, so you learn where to look things up in the book — the skill that wins an open-book exam. WHAT YOU GET • 598 practice questions in the style of state general contractor / builder license exams (PSI, ICC and NASCLA formats). • Organized by IBC chapter: 4 Special Requirements, 5 Building Heights and Areas, 6 Types of Construction, 7 Fire and Smoke Protection, 8 Interior Finishes, 9 Fire Protection Systems, 10 Means of Egress, 11 Accessibility, 12 Interior Environment, 14 Exterior Walls, 15 Roof Assemblies, 16 Structural Design, 17 Special Inspections, 18 Soils and Foundations, 19 Concrete, 21 Masonry, 23 Wood, 25 Gypsum Board and Plaster, 26 Plastic, 29 Plumbing Systems, 31 Special Construction, 33 Safeguards During Construction, 34 Existing Structures. • OSHA construction safety questions and a set of general questions on estimating, scheduling and jobsite practice. • Code references on most questions, keyed to the 2015 and 2018 editions of the IBC. LISTEN AND LEARN Every chapter's questions and correct answers are recorded as audio. Play a chapter on the drive to the jobsite, with lock-screen controls, skip back and ahead, and it keeps playing while you use other apps. Study time you did not have before. STUDY BY CHAPTER Pick one chapter or drill the whole bank. Each chapter has a progress bar that fills as you answer correctly. Missed questions collect in their own pile so you can retry them until they stick. When every bar is green, you are ready. ROUNDS AND SCORES Study in 10-question rounds. Each round ends with a results card: how many you got right on the first try, how long it took, and which chapters to review. WHO IT IS FOR • Candidates for a state general contractor, residential contractor or building contractor license. • Apprentices and foremen who want to learn the building code while the concepts are fresh. • Working contractors who want a quick refresher before an inspection or a renewal exam. One-time purchase. Everything works offline once installed. No ads, no account, no data collected. International Building Code®, IBC® and International Code Council® are registered trademarks of the International Code Council, Inc. OSHA is an agency of the U.S. Department of Labor. This app is not affiliated with, sponsored by, or endorsed by the International Code Council, OSHA, or any state licensing board. Questions summarize code requirements in the author's own words for study purposes; consult the current edition of the IBC adopted by your jurisdiction as the definitive reference. Privacy Policy: https://lookie.biz/contractor/ Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

K20 START4 screens
Contractor Exam Prep4 screens

Verdict

The call

The clearest difference is review sentiment: Contractor Exam Prep at 100% against K20 START's 33%. Contractor Exam Prep also leads on rating (5.0 vs 3.9). K20 START's advantage is price (Free vs $9.99) and update cadence (every 2 months vs every 46 months). On ads, in-app purchases, device support and iOS requirement 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

K20 START is free to download; Contractor Exam Prep costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

ReceptionRating · Positive reviews · Number of ratings

Contractor Exam Prep holds the better App Store score, 5.0 against 3.9. That said, the two scores are not equally well evidenced: K20 START has 7 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 33% of K20 START's written reviews are positive against 100% of Contractor Exam Prep's.

UpkeepUpdate frequency

K20 START ships an update every 2 months, Contractor Exam Prep every 46 months. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

Scorecard6 real differences · 4 level
K20 START versus Contractor Exam Prep: the parameters behind the verdict, then further details
ParameterK20 STARTContractor Exam Prep
PriceFree — better$9.99
Rating3.9 (7 ratings)5.0 (1 ratings) — better
Positive reviews33.3% of reviews100.0% of reviews — better
Number of ratings7 — better1
Update frequencyEvery 2 months — betterEvery 46 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree — betterPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size194 MB50 MB
Age rating4+4+
DeveloperK20 Center - University of Oklahomabuckley johnson

Customer experience

K20 START

All ratings7 ratings
Positive71.4%
Neutral0.0%
Negative28.6%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Contractor Exam Prep

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

K20 START

No in-app purchases

None

Contractor Exam Prep

No in-app purchases

Questions

Is K20 START free?
K20 START is free to download, with no in-app purchases.
Is Contractor Exam Prep free?
Contractor Exam Prep costs $9.99, with no in-app purchases.
Which has better reviews, K20 START or Contractor Exam Prep?
Contractor Exam Prep is rated higher. K20 START averages 3.9 out of 5 from 7 ratings, while Contractor Exam Prep averages 5.0 from 1 ratings.
Do K20 START or Contractor Exam Prep have ads?
Neither K20 START nor Contractor Exam Prep shows ads.
Which is updated more often, K20 START or Contractor Exam Prep?
K20 START ships an update every 2 months, and Contractor Exam Prep every 46 months. Most recently, K20 START was updated on October 12, 2026 and Contractor Exam Prep on October 16, 2026.

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