Dart vs Freezed: Benchmark Tests Four Ways to Write a Data Class

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A developer benchmarked four approaches to writing a data class in Dart — Freezed 4, Equatable, pure Dart 3.13, and Freezed 4 with primary constructors — using a shared suite of 16 tests on a single Note model. The comparison measured lines written, lines generated, build time, and how many places need updating when a new field is added. Dart 3.13, which made primary constructors stable on 12 August 2025, has been gradually closing the gaps that originally made Freezed necessary back in 2020. No single approach outperformed the others across all criteria, with each breaking down in different scenarios. The findings point toward a recommended default approach, with identified exceptions where that default is not the best fit.

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