Comparison

System Design interview prep vs System Design Refresher

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

Head to head
About

System Design interview prep

This app simulates system design interviews with an AI interrogator and interactive scenarios. Practice real-world architecture problems, receive instant feedback, and track your progress to ace your next tech interview.

Highlights
  • Interactive War Room for architecture scenarios
  • AI Interrogator challenges design decisions
  • Realistic system design interview questions
  • Daily practice drills for skill sharpening
  • Detailed performance analytics
  • Instant feedback and best practice learning
Features
Read full description

ArchSim is the ultimate training ground for software engineers preparing for system design interviews. Forget passive reading—ArchSim puts you in the driver’s seat of a high-stakes engineering simulation with a fast, value-first onboarding and a 60‑second drill preview to get you into the action quickly. Key Features: Interactive War Room: Solve real-world architecture scenarios in a dynamic environment. Define requirements, estimate capacity, and design your system component by component. AI Interrogator: Face off against an intelligent Prep AI that challenges your decisions, asks follow-up questions, and probes for weaknesses in your design. Realistic Scenarios: Tackle classic and modern interview questions like “Design a URL Shortener” and “Design a Social Network.” Perfect for your job search. Daily Drills: Short 5–10 minute practice sessions to build fundamentals, track streaks, and sharpen core skills. Detailed Analytics: Track your performance, identify knowledge gaps, and monitor your improvement over time with comprehensive metrics. Debrief & Learn: Get instant feedback on your design choices and learn best practices for scalability, reliability, and maintainability. Whether you are a junior developer or a staff engineer, ArchSim provides the practice you need to ace your next tech interview and land your dream job. ----------- Subscriptions automatically renew unless auto-renew is turned off at least 24 hours before the end of the current period. Your account will be charged for renewal within 24 hours prior to the end of the current period. Terms of Use: https://calico-magnolia-61e.notion.site/archsim-terms-of-use-2c6 Privacy Policy: https://calico-magnolia-61e.notion.site/archsim-privacy-policy-2c

About

System Design Refresher

Features
Read full description

System Design Refresher is a free study companion for software engineers preparing for system design interviews. WHAT'S INSIDE • 30+ system design articles covering distributed systems, databases, caching, and more • Engineering blogs from top tech companies (Google, Meta, Stripe, Airbnb, and more) aggregated in one place • AI-powered flashcards with spaced repetition • Ask AI to summarize or explain any article in plain language • Favorites, reading progress tracking, and custom RSS feeds FEATURES • Works offline — articles download for reading without internet • Dark mode, font customization, and text size controls • Face ID / Touch ID lock for privacy • Sign in with Google or Apple, or use as a guest with no account required

Screenshots

System Design interview prep4 screens
System Design Refresher4 screens

Verdict

The call

The clearest difference is in-app purchases: System Design Refresher at none against System Design interview prep's 5. System Design Refresher also leads on ads (none vs shown). System Design interview prep's advantage is iOS requirement (17.6 vs 26.2). On price, update cadence and device support 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. System Design interview prep sells 5 in-app purchases, starting at $3.99 per 7 days. System Design Refresher asks for nothing beyond the download.

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly monthly. The most recent releases landed on July 23, 2026 and September 12, 2026 respectively.

Scorecard3 real differences · 7 level
System Design interview prep versus System Design Refresher: the parameters behind the verdict, then further details
ParameterSystem Design interview prepSystem Design Refresher
PriceFreeFree
Rating1.0 (2 ratings) — better—
Positive reviews0.0% of reviews—
Number of ratings2 — better—
Update frequencyMonthlyMonthly
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad
Requires iOS17.6 — better26.2
Further details — not scored
Size89 MB18 MB
Age rating4+4+
DeveloperAbdelhak El MoussaouiSaurabh Sharma

In-app purchases

5 purchases

System Design interview prep

Subscriptions5
  • Unlimited access$3.997 Days
  • Unlimited access$4.997 Days
  • Unlimited access$6.991 Month
Show 2 more
  • Unlimited access7 Days trial$12.991 Month
  • Unlimited access7 Days trial$99.991 Year
None

System Design Refresher

No in-app purchases

Questions

Is System Design interview prep free?
System Design interview prep is free to download, with in-app purchases available.
Is System Design Refresher free?
System Design Refresher is free to download, with no in-app purchases.
Do System Design interview prep or System Design Refresher have ads?
System Design interview prep shows ads; System Design Refresher does not.
Which is updated more often, System Design interview prep or System Design Refresher?
System Design interview prep ships an update monthly, and System Design Refresher monthly. Most recently, System Design interview prep was updated on July 23, 2026 and System Design Refresher on September 12, 2026.

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