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How to Make Money Selling Source Code

Buy Sell Code

Every developer has a hard drive full of finished projects: a school management system built for a client, an invoicing tool made for a friend, a Django dashboard that took three months. Most of that code never earns anything after its first use. You can change that. Selling source code is one of the easiest ways for a developer to earn passive income, because you build something once and sell it many times.

Why Buyers Pay for Source Code

Buyers don't pay for lines of code. They pay to save time. A startup founder who needs a booking system can spend $20,000 and four months having one built, or buy a working one for $99 and launch this week. Students want reference projects to learn from. Agencies want white-label bases they can rebrand for clients. Entrepreneurs want a Micro SaaS they can deploy and start charging for.

If your project saves one of these people a few weeks of work, it has value.

What Sells Best

Buyers keep looking for the same kinds of projects:

Business management systems: inventory, POS, HR/payroll, CRM, school, hospital and hotel management. The PHP and ASP.NET versions of these sell steadily.
SaaS and Micro SaaS apps: multi-tenant apps with subscription billing are worth the most, because the buyer is getting a business and not just software.
AI tools: chatbots, content generators, resume analyzers and document summarizers. Demand for these grew fast and hasn't slowed down.
Python and Django projects: these do well with data-heavy apps, admin dashboards and machine learning integrations.
C#, VB.NET, MVC and ASP.NET Core apps: these are strong with enterprise buyers and with students working on final-year projects.

How to Turn Code Into a Product

Clean it up. Remove hard-coded credentials, client names and dead code. Use consistent naming.
Document it. Write a clear README with requirements, installation steps, database setup and configuration. This gets you more sales and fewer support requests than anything else on this list.
Show it working. Add screenshots, a short video walkthrough or a live demo. Buyers want to see the product before they pay.
Price it by value, not by effort. Small utilities usually sell for 10–50, full management systems for 50–300, and SaaS-ready products for $300 and up. You can charge more for an extended license or for installation support.
Keep it updated. Upgrading to a newer framework version (for example, .NET 8 or PHP 8.x) lets you sell the same project to a new group of buyers.

Where to Sell

You can sell on your own website, but then you're responsible for bringing in the traffic yourself. A dedicated marketplace already has buyers who are looking for projects. Coderobotics is one of the best marketplaces for buying and selling source code, especially for developers who work in PHP, ASP.NET, ASP.NET Core, MVC, C#, VB.NET, Python and Django. It also has a growing catalogue of AI tools, Micro SaaS and full SaaS applications. Because it focuses on these stacks, your project is shown to buyers who are already searching for them.

The code you've already written is an asset. Polish it, document it, show it working and put it where buyers are looking. One good project can earn money for years. Ten of them can become a real income.

This article was posted by Sasi and tagged in Learn what sells how to price and package code and where to sell PHP ASP.NET Python AI and SaaS apps

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