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SOLID is not Solid is not an online course in the traditional sense, but an English-language technical book for software developers. According to the site copy, the book is about 70 pages long and focuses on critiquing the five SOLID principles in object-oriented design, while also discussing agile development slogans such as DRY, KISS, YAGNI, No Big Design Up Front, and user stories. It is positioned more as a sharply written opinion piece than as a structured teaching textbook.
Judging from the table of contents, the book covers the Single Responsibility Principle, Open/Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, and Dependency Inversion Principle. It questions issues such as vague definitions, excessive abstraction, misuse of inheritance, Java interface culture, and XML/enterprise-level complexity. In terms of delivery format, the page only provides information about the ebook and print book. There are no live classes, recorded lessons, 1-on-1 sessions, assignments, community access, or project exercises, so it is better suited to self-study reading or team book-club discussions. The teaching language appears to be English.
The ebook is priced at US$5.99 and includes multiple formats: PDF, EPUB, MOBI, and Markdown/text, making it convenient to use across different readers and devices. The print book costs US$6.99. The website clearly states that no bundle discount is available for buying the ebook and print book together. Given its length and price, the purchase barrier is low, but what it offers is content consumption rather than a complete learning service.
Its strengths are a focused topic, low price, complete file formats, and the ability to help experienced developers re-examine the widely cited SOLID and agile principles. Readers who have struggled with over-abstraction, excessive layering, or dogmatic design in real projects may find it thought-provoking. The limitations are also clear: the page does not disclose the authorβs or organizationβs background, and there is no certificate, learning path, sample code, Q&A support, or payment-method information. Based on the tone of the table of contents, the content leans critical and satirical, making it unsuitable for beginners who want to learn object-oriented design systematically from scratch.
It is better suited to engineers, technical leads, and architecture-discussion participants who already have some programming experience and have been exposed to SOLID, Clean Code, or agile practices. If your goal is to obtain a certificate, complete hands-on projects, or study a standardized software design course, other programming education platforms, software architecture courses, or classic textbooks would be more appropriate. The page does not state anything about access from China, network stability, or payment availability, so these remain unknown.
β This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on solid-is-not-solid.com official site.
solid-is-not-solid.com is an United States Education provider. TG4G tracks its product information, with monthly pricing from $5.99, an overall rating of 6.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach solid-is-not-solid.com directly.