App

App or apps may refer to:

Computing

Application software
- Mobile app, software designed to run on smartphones and other mobile devices
- Web application or web app, software designed to run inside a web browser
Adjusted Peak Performance, a metric to measure computing performance in 64-bit processors and above
Application Portability Profile, NIST standards and specifications for the Open System Environment
Atom Publishing Protocol, simple HTTP-based protocol for creating and updating web resources

Advanced Placement Program, a program offering college-level curriculum and examinations to high school students
Appalachian State University, a university in Boone, North Carolina, US
- Appalachian State Mountaineers, the university's athletic program
Assessing Pupils' Progress, an assessment methodology used in schools in England and Wales

Acute-phase protein, a class of proteins whose concentration changes in response to inflammation
Advanced practice provider, or mid-level practitioner, a class of healthcare providers
Amyloid precursor protein, a protein whose fragments are associated with Alzheimer's disease and other neurological disorders

African Prisons Project, a UK-based NGO
Alberta Provincial Police, a Canadian police force from 1917–1932
American Principles Project, a libertarian and conservative political think tank
Asia-Pacific Partnership, an international environmental protection alliance
Asia Pulp & Paper, a pulp and paper company based in Jakarta, Indonesia
Associated Press of Pakistan, a national news agency of Pakistan
Association of Professional Piercers, an international organization for body piercing

All People's Party (disambiguation)
Alliance populaire progressiste or People's Progressive Alliance, a political party in Mauritania
Animal Protection Party, a British political party
Australian Protectionist Party, an Australian political party
Austrian People's Party, an Austrian political party
Reason Party (Poland) or Anticlerical Progress Party REASON, a Polish political party