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Dermola
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Hana Sato, MS, BS

Data Analyst

About Hana Sato

Hana Sato serves as the quantitative backbone of the lab. They craft the testing protocols, compute the per-application statistics that form the basis of every published score, and manage the mathematical context of the lab’s key benchmarks. The lab’s assertion that a tracking application achieves a MAPE of 8.4% on the reference battery, with a 95% confidence interval ranging from 6.1% to 10.7%, is a statement that exists on the website because of Hana's insistence.

Hana has a background in applied mathematics from Berkeley and statistics from Stanford. Their master's thesis focused on measurement-error models related to patient-reported nutritional intake, which aligns with the area Dermola assesses, albeit in an academic context instead of a consumer-app benchmark. Before joining the Lab in September 2025, they spent three years at a healthcare technology firm developing statistical models from noisy outcome data; they were drawn to the Lab after hearing Mateo say, almost verbatim, “the calorie-tracking app category represents the largest applied-statistics issue in consumer software that lacks a statistician's involvement.”

Credentials in detail

Editorial focus

Hana is responsible for the architecture of test protocols (in collaboration with Mateo); the methodology for MAPE calculations and their dissemination; the standards for confidence intervals and sample sizes across the website; the style guide for data visualization; and the statistical review of each benchmark published. They work alongside Mateo on the methodology page and serve as the primary reviewer for any numerical assertions.

Conflicts of interest

Hana has no financial ties to companies that produce calorie tracking applications. They do not own equity in or receive compensation from any app assessed on this platform. They have no affiliate accounts. Their earnings come exclusively from this publication. They have never accepted payment from any company whose product is evaluated here.

Recent Work

Articles

App Reviews

Comparisons