About Looker
Google Cloud's BI tool, with a git-versioned semantic layer baked in.
Looker was founded in January 2012 in Santa Cruz by Lloyd Tabb and Ben Porterfield, built around LookML: a modelling language that puts dimensions, measures and joins in version-controlled files instead of inside individual reports. Google acquired the company in February 2020 (announced June 2019, $2.6 billion) and folded it into Google Cloud as the modelled, enterprise side of the BI portfolio. Looker Studio is the separate free dashboarding tool from the same Google family; the two products share branding but not the LookML semantic layer or the developer workflow.
The platform splits into the Looker IDE for LookML authoring, the web app for Explores, Looks and dashboards, scheduled deliveries to email and Slack, and an embedded SDK for customer-facing analytics. It connects to roughly 40 databases, with BigQuery, Snowflake, Redshift and Postgres as the typical landing spots. The strength is that one LookML project becomes the source of truth for how a metric is calculated, with branches, pull requests and a history of who changed what. The weakness is the same one that hits Power BI and Tableau pages: if the underlying warehouse is messy, every Explore inherits the mess and BigQuery slot spend climbs with it. We curate the warehouse so the LookML layer stays declarative and compute stays in budget.