Comparison

Codebook vs Linear System Solver

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

Head to head
About

Codebook

This app offers AI-powered coding assistance, lessons, and a built-in code editor. It helps users learn, write, run, and test code, build portfolios, and earn certifications. Access to advanced AI models is provided.

Highlights
  • AI-powered coding assistance
  • Instructor-led coding lessons
  • Built-in code editor
  • Code execution and testing
  • Certification and rewards
  • Personalized learning plans
  • Developer portfolio builder
Features
Read full description

Unlock the Future of Coding with Codebook – The Most Affordable AI-Powered Coding Companion! Supercharge your coding journey with Codebook, the only app that gives you completely free access to the latest and greatest AI models – GPT-3 and GPT-4. Experience cutting-edge assistance, including exclusive features like sending images to GPT-3, which no other app offers! AI-Powered Coding Assistance: Get instant answers to all your coding questions with Codebook's powerful AI, ready to generate detailed, formatted code snippets and solve even the toughest bugs in seconds. Whether you're a beginner or an expert, Codebook adapts to your needs, making coding effortless and efficient. Instructor-Led Coding Lessons: Watch in-app coding lessons taught by an experienced instructor. Open a 24/7 chat to ask questions anytime and get the help you need — instantly. Run Code Instantly: Write, run, and test code in any language right within the app. With Codebook's built-in code editor, you can seamlessly switch between learning, coding, and executing, making it easier than ever to master any programming language. Earn Certifications and Rewards: Prove your skills! Complete challenges, earn rewards, and get certified by passing language-specific exams. Codebook’s personalized learning modules guide you through, so you can confidently ace the exams and showcase your certifications. Personalized Learning Plans: Take control of your learning path with tailor-made programs for any language. Codebook’s adaptive plans ensure you’re always building on your strengths and tackling new challenges, keeping your skills sharp and future-ready. Developer Portfolio Made Easy: Build a professional developer portfolio, hosted online, directly from the app. Perfect for resumes and job applications, your portfolio showcases your progress and achievements, helping you stand out in the tech world. Join a Community of Thriving Coders: Thousands of coders are already benefiting from Codebook's innovative features. Join the community and explore the new era of coding with AI as your guide! Privacy You Can Trust: We prioritize your security with Apple's privacy standards, ensuring that your data stays protected while you focus on leveling up your skills. Download Codebook today and discover how affordable, advanced, and enjoyable learning to code can be! Embrace the future of coding with AI at your side – for free. Our subscription options include the following weekly subscriptions. The subscriptions automatically renew unless canceled 24 hours before the end of the current period. - Codebook Professional - Length of Subscription: 1 week - Price: $4.99 per week - Gives access to all premium features - Codebook Professional Without Ads - Length of Subscription: 1 week - Price: $7.99 per week - Gives access to all premium features without Ads - Codebook Remove Ads - Length of Subscription: 1 week - Price: $2.99 per week - Fully removes ads from Codebook - Privacy Policy: https://qwertycode.org/legal/Codebook-Privacy-Policy.html - Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Linear System Solver

Features
Read full description

This application helps students or any person who needs, to solve a system of 3 linear equation with 3 unknowns. A system of linear equations is of this type: / | a11.x + a12.y + a13.z = c1 | a21.x + a22.y + a23.z = c2 | a31.x + a32.y + a33.z = c3 \ Values are required for x,y,z which satisfy the 3 equations. In the application skema, insert the matrix coefficients: a11 a12 a13 a21 a22 a23 a31 a32 a33 and next insert the constant values: c1 c2 c3 Finally, hit the Solve button. If the system has a real solution, this will be shown (x,y,z) in the last row. If no real solution exists, NO,NO,NO will be shown.

Screenshots

Linear System Solver2 screens

Verdict

The call

The clearest difference is price: Codebook at Free against Linear System Solver's $0.99. Linear System Solver's advantage is in-app purchases (none vs 21) and ads (none vs shown). On update cadence, 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

Codebook is free to download; Linear System Solver costs $0.99 up front. Codebook sells 20 in-app purchases, starting at $2.99 per 7 days. Linear System Solver asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 3 days. The most recent releases landed on September 27, 2026 and September 26, 2026 respectively.

Scorecard3 real differences · 7 level
Codebook versus Linear System Solver: the parameters behind the verdict, then further details
ParameterCodebookLinear System Solver
PriceFree — better$0.99
Rating5.0 (31 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings31 — better—
Update frequencyEvery 3 daysEvery 3 days
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS15.615.0 — better
Further details — not scored
Size136 MB1 MB
Age rating4+4+
DeveloperNoah ClarkLuigi Fonti

In-app purchases

20 purchases

Codebook

Subscriptions3
  • Codebook Remove Ads$2.997 Days
  • Codebook Professional$4.997 Days
  • Codebook Pro Without Ads$7.997 Days
One-time17
  • Codebook Challenge Answer$1.99
  • Codebook Widgets 1 Month$2.99
  • Codebook Challenge Refresh$2.99
Show 14 more
  • 25 Codebook Tokens$2.99
  • GPT 4 Access$2.99
  • 50 Codebook Tokens$3.99
  • Codebook Certification$3.99
  • Codebook Tokens$5.99
  • 50 Codebook Tokens2 variants$5.99
  • GPT4-Codebook$5.99
  • Codebook Remove Ads$5.99
  • 100 Codebook Tokens$8.99
  • Codebook Remove Ads$9.99
  • GPT-4 Access for Codebook$9.99
  • GPT-4 1 Month Access$12.99
  • Codebook Remove Ads$12.99
  • 1 Month Idea Hub Access$14.99
None

Linear System Solver

No in-app purchases

Questions

Is Codebook free?
Codebook is free to download, with in-app purchases available.
Is Linear System Solver free?
Linear System Solver costs $0.99, with no in-app purchases.
Do Codebook or Linear System Solver have ads?
Codebook shows ads; Linear System Solver does not.
Which is updated more often, Codebook or Linear System Solver?
Codebook ships an update every 3 days, and Linear System Solver every 3 days. Most recently, Codebook was updated on September 27, 2026 and Linear System Solver on September 26, 2026.

Other comparisons