Metaculus is an American reputation-based, massive online prediction solicitation and aggregation engine.

[1] One of the focuses of Metaculus is predicting the timing, nature and impact of scientific and technological advances and breakthroughs.

[7] Data scientist Max Wainwright and physicists Greg Laughlin and Anthony Aguirre launched the site in 2015.

[9] In 2021, Metaculus received an Effective altruism infrastructure fund grant worth $300k.

[12] In 2022 the organization announced it reached 1,000,000 individual predictions, and that it was restructured as a public-benefit corporation, it is committed to the following goals, its new charter compels it to report annually on its progress in achieving these goals:[13] In 2024, Metaculus rewrote their website code and released it under the BSD-2-Clause License.