Design Pattern Recommender
Find the right design pattern for your code problem
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Have you ever known your class was doing too much, without knowing what to do about it? Or read about a pattern and not been sure it fitted your problem? Design Pattern Recommender takes the problem in your code and suggests the pattern that actually addresses it, with the reasoning attached.
Short answer: Design Pattern Recommender reads a description of your code problem and suggests a fitting design pattern, explaining why it applies, how it would be structured here, and what it costs you to adopt.
What is Design Pattern Recommender?
Design Pattern Recommender is a free tool for the moment before a refactor. You describe the shape of the problem, such as a class that changes for four different reasons or a chain of conditionals that grows with every new payment provider, and it recommends candidate patterns. Each comes with the reason it fits, a sketch of the structure, and the complexity you take on by using it.
How Does Design Pattern Recommender Work?
- Describe the system and the problem you are trying to solve.
- Pick a model, then set System Type and Scale so the suggestion suits your context.
- Generate, and read the recommendation with its trade offs before touching code.
| Option | What it changes | Suggested value |
|---|---|---|
| System Type | Web app, API, backend, microservices, data pipeline and others | Whichever describes the code in front of you |
| Scale | Small, Medium, Large or Enterprise | Be honest, since patterns that help at scale hurt small projects |
| Output | Design overview, diagram in text, components and flow, or trade off analysis | Trade-off Analysis when you are choosing between two options |
| Style | Simple, Detailed, Best-Practice or Pragmatic | Pragmatic, which favours the smaller change |
Note Trade-offs is the toggle worth keeping on. A recommendation without its cost is how teams end up with a factory producing one object.
Describing The Problem, Not The Pattern
The most common mistake is asking whether to use a named pattern. Describe the symptom instead: what changes together, what you keep editing, what breaks when you add a case. A good description names the axis of change, because that is what patterns are chosen to absorb. Say how often that change actually happens too, since a pattern that pays off monthly is waste if the change comes once a year.
Tip Include the language and roughly how large the class or module is. The same problem calls for different answers in a small script and in a service with twenty collaborators.
One Tangled Class, One Recommendation
Say you paste: "OrderProcessor has a switch on payment provider, six branches, and every new provider means editing three methods". Set System Type to Backend, Scale to Medium, Style to Pragmatic. The recommendation comes back as Strategy, with a sketch of the interface, where the switch becomes a lookup, and an honest note that you are trading one readable switch for several small classes. That last part is the sentence that lets you decide rather than comply.
Where A Pattern Makes Things Worse
Worth applying
- The same change keeps touching several files
- New cases arrive regularly and predictably
- Tests are hard to write because responsibilities are tangled
Leave it alone
- The code is ugly but stable and rarely edited
- You have exactly two cases and no third in sight
- The pattern adds indirection your team does not know
When applying the pattern breaks something, paste the failure into the Error Fixer rather than reverting the whole refactor.
A large collection of developer tools sits on EizTools, all free, with nothing to register for and nothing to spend, and the model selector means a second opinion on the same problem is one click away. Design Pattern Recommender sits with the architecture tools in the coding tools category, each with its own options.
Frequently Asked Questions
Does it cover more than the classic patterns?
Yes. Alongside the familiar ones it will suggest architectural approaches such as event driven handling or a repository layer when the problem is bigger than a single class.
Will it write the code?
It sketches the structure rather than producing a full implementation. Ask for an example in a specific language and you get a skeleton to work from.
What if two patterns both fit?
That is common, and the trade off notes are the tiebreaker. Choose the one your team can read without a reference, since maintainability is the point of the exercise.
Do I need to paste my source code?
No. A description of the problem usually gets a better answer than a large paste, and it keeps proprietary code out of the prompt box.
Patterns are a vocabulary for problems, not a checklist to work through. Getting a recommendation with its cost stated makes the decision an engineering one, which is the difference between a refactor that helps and one that just moves the mess.
Sabir Bepari
Founder of EizTools and a passionate AI enthusiast dedicated to building practical, user-friendly AI tools that simplify everyday tasks.
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