# nostalgia_index > Wikipedia pageviews as a cultural pulse: a normalized nostalgia index, Shiny app and CLI. ## Docs ### API Reference #### Dataclasses > Dataclass definitions - [NostalgiaIndex](reference/NostalgiaIndex.html): Compute and hold the nostalgia index for one or more topics #### Functions > Utility functions - [fetch_project_total](reference/fetch_project_total.html): Fetch total daily views for a project (``/aggregate/`` endpoint), used as the denominator - [fetch_views](reference/fetch_views.html): Fetch daily pageviews for a single Wikipedia article - [run_app](reference/run_app.html): Launch the Nostalgia Index Shiny app