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Lightweight software

Computer program with low system resource usage

Wikipedia contributorsAdapted for Fathomly · View authors
1 min read
Source updated August 11, 2026
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In computing, lightweight software also called lightweight program and lightweight application, is a computer program that is designed to have a small memory footprint (RAM usage) and low CPU usage, overall a low usage of system resources. To achieve this, the software should avoid software bloat and code bloat and try to find the best algorithm efficiency.

01Examples

While all software development generally tries to avoid excessive size and including unnecessary code through various best practices and compiler optimization, lightweight software development implies the employment of specific programming techniques and styles designed to produce extremely small and performant software.

A demonstrative example of the extreme end of lightweight software are complex programs developed entirely in assembly language.

Lightweight software for everyday use usually refers to apps that are used frequently, offer a limited set of features, and start and run quickly.

  • Neovim, A terminal-based text editor with an extremely broad feature set and programmability via Lua. Because Neovim lacks any graphical user interface (GUI), it can include many features, while remaining lightweight, because the graphics libraries are the "heaviest" part of most applications.
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This article is adapted from the Wikipedia article “Lightweight software”, written by its contributors and licensed under CC BY-SA 4.0. Fathomly has changed the layout, removed citation markers, navigation and maintenance notices, and adjusted punctuation. This adapted version is shared under the same license. For references, see the original article.

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Related topics

Program optimization

In computer science, program optimization, code optimization, or software optimization is the process of modifying a software system to make some aspect of it work more efficiently or use fewer resources. In general, a computer program may be optimized so that it executes more rapidly, or to make it capable of operating with less memory storage or other resources, or draw less power.

Application footprint

In computing, an application footprint "defines how much memory the application requires to execute at peak load." This provides a sense of sizing of an application's various constituents, and hence, is a spatial measurement, in a given context, such as disk footprint, memory footprint, network footprint, etc.

Light-weight process

In computer operating systems, a light-weight process is a means of achieving multitasking. In the traditional meaning of the term, as used in Unix System V and Solaris, a LWP runs in user space on top of a single kernel thread and shares its address space and system resources with other LWPs within the same process.