Comparison

Unbuilt Works vs SOLID Architecture

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

Head to head
About

Unbuilt Works

Features
Read full description

THE GREATEST BUILDINGS IN HISTORYβ€”THAT WERE NEVER BUILT. What if Frank Lloyd Wright's mile-high skyscraper reshaped Chicago? What if Buckminster Fuller's floating cities became real? What if Paris built a pyramid larger than Giza? Unbuilt Works explores the world's most ambitious unbuilt architecture, visionary design concepts, and historical projects that came shockingly close to reality. EXPLORE UNBUILT ARCHITECTURE WORLDWIDE Discover thousands of unbuilt buildings, concept architecture, and never-built megastructures through an interactive global map. Tap any location to see what architects once planned for that city. BROWSE BY ERA, STYLE, AND ARCHITECT Find forgotten projects from: - Ancient Roman engineering - Renaissance city planning, including da Vinci's ideal city - Modernism, Brutalism, and postmodern proposals - Wright, Fuller, Zaha Hadid, and more - Futuristic, experimental, and conceptual architecture Search unbuilt skyscrapers, urban design concepts, retro-futurism, parametric ideas, and radical architectural visions from every era. LEARN WHY THEY WERE NEVER BUILT Each project includes detailed commentary on the political, engineering, economic, and design challenges that prevented construction: - Political opposition and planning failures - Financial collapse and budget overruns - Engineering limits of the era - Unrealistic design concepts - Wars, cultural shifts, and lost opportunities FEATURED PROJECTS - The Palace of the Soviets - Tatlin's Tower - The Mile-High Illinois - Metabolist megastructures - Unrealized Grand Central replacements - Experimental, cancelled, and visionary proposals worldwide Perfect for anyone who loves architecture, design history, urban planning, and speculative buildings. GO PREMIUM FOR FULL ACCESS Upgrade anytime to unlock: - Unlimited favorites - Advanced search by architect, era, style, or region - Complete access to thousands of unbuilt projects - No ads - Support independent architectural research ABOUT UNBUILT WORKS Unbuilt Works provides educational analysis, architectural commentary, and documented historical research on projects that influenced designβ€”despite never being built. Explore how these ideas shaped cities, movements, and modern architecture. Download for free and start discovering the world that could have been. What if they built it? Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

SOLID Architecture

Features
Read full description

Learning SOLID is an educational app focused on software architecture and development best practices. The goal of the app is to teach SOLID principles in a clear, practical, and applicable way for everyday development. The content is organized into modules, with one module dedicated to each SOLID principle. Each module combines theoretical explanations, real world examples inspired by professional scenarios, and practical exercises to reinforce learning. The app was designed for those who want to understand not only the concept, but also how to apply SOLID in real projects. The examples show tightly coupled code, common maintenance problems, and how to refactor into cleaner and more scalable solutions. In the practical section, users interact with a simple and intuitive interface, allowing them to practice concepts without needing to type code. This enables full focus on architectural thinking and understanding the responsibilities of each class or component. Main features of the app: Clear and objective explanation of all SOLID principles A complete module for each letter of SOLID Real world examples based on market problems Practical and interactive exercises Comparison between incorrect code and refactored code Content focused on architecture and best practices Simple interface for distraction free learning Learning SOLID is recommended for students, beginner developers, and professionals who want to strengthen architectural concepts, write cleaner code, and build systems that are easier to maintain and evolve.

Screenshots

Unbuilt Works4 screens
SOLID Architecture4 screens

Verdict

The call

The clearest difference is ads: SOLID Architecture at none against Unbuilt Works's shown. Unbuilt Works's advantage is iOS requirement (13.4 vs 15.0). On price, update cadence, in-app purchases and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

Both are free to download. Unbuilt Works sells 2 in-app purchases, starting at $4.99 per month and SOLID Architecture sells 3 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Unbuilt Works ships an update every 5 days, SOLID Architecture every 9 days. The most recent releases landed on October 16, 2026 and October 15, 2026 respectively.

Scorecard2 real differences Β· 4 level
Unbuilt Works versus SOLID Architecture: the parameters behind the verdict, then further details
ParameterUnbuilt WorksSOLID Architecture
PriceFreeFree
Update frequencyEvery 5 days β€” betterEvery 9 days
AdsYesNo β€” better
In-app purchasesYesYes
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.4 β€” better15.0
Further details β€” not scored
Size39 MB102 MB
Age rating4++4
DeveloperBrett CassidyAirton Siqueira de Freitas

In-app purchases

2 purchases

Unbuilt Works

Subscriptions2
  • Premium Monthly$4.991 Month
  • Premium Yearly$39.991 Year
3 purchases

SOLID Architecture

One-time3
  • CERTIFICATE OF COMPLETION$2.99
  • Premium access$4.99
  • FULL PASS ALL APPS$17.99

Questions

Is Unbuilt Works free?
Unbuilt Works is free to download, with in-app purchases available.
Is SOLID Architecture free?
SOLID Architecture is free to download, with in-app purchases available.
Do Unbuilt Works or SOLID Architecture have ads?
Unbuilt Works shows ads; SOLID Architecture does not.
Which is updated more often, Unbuilt Works or SOLID Architecture?
Unbuilt Works ships an update every 5 days, and SOLID Architecture every 9 days. Most recently, Unbuilt Works was updated on October 16, 2026 and SOLID Architecture on October 15, 2026.

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