Every tool, essay, and idea on LifeByLogic.
A curated hub for browsing the publication. The four labs above. The flagship tools below. Long-form essays, foundational glossary terms, and everything else — organized for finding, not just listing.
Four volumes of an examined life. Each lab is a curated collection of tools for one dimension of self-understanding.
Neuroscience-backed cognitive tools
Evidence-based assessments and calculators for cognitive performance, sleep, memory, and brain health — built on peer-reviewed neuroscience.
Decision support for life's biggest forks
Multi-variable simulators and decision-support frameworks for career switches, quitting, relocations, and other consequential life decisions.
Cognitive bias and behavioral science
Tools built on cognitive psychology and behavioral economics. Detect biases, measure anxiety, build better habits — grounded in Kahneman and Thaler.
Personal analytics and flourishing metrics
Wellbeing measurement and longitudinal life pattern tracking — flourishing, attachment, depression, stress, loneliness — peer-reviewed methodology.
The most-used instruments across all labs — each free, browser-local, and grounded in peer-reviewed methodology.
Brain Age Index: Estimate Your Brain's Biological Age
Free Brain Age Index calculator based on the 2024 Lancet Commission framework. Estimate your brain's biological age from 12 lifestyle…
Open tool →LBL Flourishing Index: 16 Dimensions of a Flourishing Life
LBL-original 25-item assessment measuring 16 dimensions of human flourishing across 9 core and 7 contextual facets, benchmarked against the Global Flourishing Study (VanderWeele et al. 2025).
Open tool →Sleep-Cognition Optimizer — Personalized Sleep Schedule Tool
Behavioral sleep assessment with personalized schedule. 12 items, computes social jet lag and Sleep Regularity Index. Prescribes bedtime,…
Open tool →Should I Quit? An Evidence-Based Decision Framework
Free interactive framework for evaluating whether to quit your job, relationship, project, or commitment. Based on stay-vs-go decision…
Open tool →Cognitive Bias Susceptibility: Measure Your Decision Hygiene
Free assessment of your susceptibility to 7 cognitive biases. Behavioral tasks grounded in research from MIT, Princeton, Harvard, and…
Open tool →Cognitive Reserve Estimator — Free 6-Domain Test
Free Cognitive Reserve Estimator: 6-domain evidence-weighted assessment based on Stern's framework, the CRIq, and the 2024 Lancet…
Open tool →Stress & Burnout Index — Free 16-Item Self-Inventory
Free 16-item LBL-original self-inventory measuring perceived stress and personal burnout. Two scores, four severity bands, five archetypes.…
Open tool →LBL Chronotype Profile — Biological Chronotype Test (14…
Free 14-item biological-trait chronotype assessment grounded in 2019-2025 chronobiology research. Age-sex calibrated, continuous score with…
Open tool →The complete inventory. Every tool with its description and a direct link to the full methodology behind it.
Brain Lab
Brain Age Index: Estimate Your Brain's Biological Age
Free Brain Age Index calculator based on the 2024 Lancet Commission framework. Estimate your brain's biological age from 12 lifestyle inputs.
Methodology →Sleep-Cognition Optimizer — Personalized Sleep Schedule Tool
Behavioral sleep assessment with personalized schedule. 12 items, computes social jet lag and Sleep Regularity Index. Prescribes bedtime, caffeine, exercise.
Methodology →How Much Sleep Do You Need? Sleep Need Calculator by Age
Find out how much sleep you need by age. Free Sleep Need Calculator built on AASM and NSF consensus guidelines — with weekly sleep debt and lifespan view.
Methodology →Cognitive Reserve Estimator — Free 6-Domain Test
Free Cognitive Reserve Estimator: 6-domain evidence-weighted assessment based on Stern's framework, the CRIq, and the 2024 Lancet Commission. 4-6 minutes.
Methodology →LBL Chronotype Profile — Biological Chronotype Test (14 Items)
Free 14-item biological-trait chronotype assessment grounded in 2019-2025 chronobiology research. Age-sex calibrated, continuous score with descriptive band.
Methodology →Crossroads Lab
Behavior Lab
Life Dashboard
LBL Flourishing Index: 16 Dimensions of a Flourishing Life
LBL-original 25-item assessment measuring 16 dimensions of human flourishing across 9 core and 7 contextual facets, benchmarked against the Global Flourishing Study (VanderWeele et al. 2025).
Methodology →Attachment Style Decoder — Free 20-Item LBL Attachment Profile
Free 20-item adult attachment test grounded in 30+ years of attachment research. Four archetypes — Anchor, Tide, Island, Storm — with the science behind each.
Methodology →Depression Test — Free 9-Item Screen with Symptom Profile
Free 9-item depression screener (Kroenke 2001) with severity bands, symptom profile, archetype, and care-aware crisis support. 2 minutes, browser-local.
Methodology →Original frameworks and research deep-dives on brain, behavior, and decision science. Long-form, citation-anchored, opinionated.
The 17 Factors That Age Your Brain
And what the 2024 Lancet Commission missed
Fourteen modifiable risk factors from the global consensus framework. Three more from emerging evidence. What actually ages your brain — and a tool to estimate where yours stands.
What Human Flourishing Actually Is
And how to measure your own
Six measurable domains. 200,000 participants across 22 countries. One of the most consequential wellbeing studies of the decade — and one finding that should reset how we talk about happiness in 2026.
The Four Species of Web Content
A taxonomy for the AI era
AI is not killing the web. It's killing two of the four things on it — and making the other two more valuable than ever. The framework behind LifeByLogic.
Defined terms across neuroscience, behavioral economics, and decision science. The most foundational entries are below; the full glossary holds 60+ terms.
About the publication, the editorial methodology, and the fine print.
Looking for the machine-readable sitemap? It lives at /sitemap.xml — 141 URLs in the standard sitemaps.org 0.9 format.