Likelihood-Free Parameter Estimation using Neural Networks R package NeuralEstimators version 0.2.1 An 'R' interface to the 'Julia' package 'NeuralEstimators.jl'. The package facilitates the user-friendly development of neural Bayes estimators, which are neural networks that map data to a point summary of the posterior distribution (Sainsbury-Dale et al., 2024, <doi:10.1080/00031305.2023.2249522>). These estimators are likelihood-free and amortised, in the sense that, once the neural networks are trained on simulated data, inference from observed data can be made in a fraction of the time required by conventional approaches. The package also supports amortised Bayesian or frequentist inference using neural networks that approximate the posterior or likelihood-to-evidence ratio (Zammit-Mangion et al., 2025, Sec. 3.2, 5.2, <doi:10.48550/arXiv.2404.12484>). The package accommodates any model for which simulation is feasible by allowing users to define models implicitly through simulated data. Software Imports: JuliaConnectoR, magrittr Suggests: dplyr, ggplot2, ggplotify, ggpubr, gridExtra, knitr, rmarkdown, markdown, R.rsp, testthat (>= 3.0.0) Matthew Sainsbury-Dale <msainsburydale@gmail.com> Comprehensive R Archive Network (CRAN) Matthew Sainsbury-Dale [aut, cre] GPL (>= 2) 2026-04-28 application/tgz https://CRAN.R-project.org/package=NeuralEstimators doi:10.32614/CRAN.package.NeuralEstimators