How the Performance Index is built.
A transparent rating system for performance tools, wearables, productivity software, fitness platforms, supplements, books, and coaches. Six data sources. Five weighted subscores. Quarterly refresh. Brands cannot pay to improve their grade — methodology and source data are published in full.
Guiding Principles.
The Performance Index exists to answer a single question for business athletes: which tools actually move the performance needle — and which are well-marketed friction?
- Research over marketing. Every rated tool's claims are cross-referenced against peer-reviewed research where applicable. Marketing copy is not evidence.
- Brands cannot pay. No rated brand has paid, can pay, or has been offered the opportunity to pay for inclusion, exclusion, or modification of their grade.
- Quarterly refresh. Grades update every 90 days; new tool releases trigger interim updates.
- Subscore transparency. Every grade decomposes into five public subscores.
- Right of correction. Brands may submit documented corrections via published Appeals process.
The Six Data Sources.
Peer-Reviewed Research
PubMed, Google Scholar, and journal databases. Required for validation of any wearable, supplement, or behavior-change tool's claims.
Independent Product Testing
Independent product testing (Quantified Self community, DCRainmaker, The Verge, Wirecutter, MKBHD). Cross-referenced product accuracy and durability.
FDA Records
FDA medical device clearances + supplement adverse event reports (CAERS). Critical for wearables (FDA-cleared cardiac features) and supplement safety.
FTC Complaints
FTC consumer complaints database. Critical for supplement-claim and subscription-service brand evaluation.
User Reviews (Aggregated)
Aggregated reviews from Amazon, App Store, Google Play, Reddit (r/QuantifiedSelf, r/productivity), Trustpilot. Cross-validated against research.
BAM Proprietary User Cohort
BAM's published user-cohort framework. 1000+ business-athlete subscribers report on tool adherence, behavior change, and cost-to-outcome ratios.
The Five Subscores.
Data Accuracy
Does the tool measure what it claims to measure? For wearables: validation against gold-standard reference (polysomnography for sleep, ECG for heart rate). For software: does it surface accurate signals from user behavior?
Behavior Change
Does using the tool actually produce measurable behavior or outcome improvement? Research-validated and user-cohort-survey-validated outcome changes.
Friction / Adherence
How easy is the tool to sustain in daily use? Subscription friction, daily-use friction, partner-tolerance friction. Sustained use is required for outcomes.
Cost-to-Outcome
Value per dollar. Premium-priced tools must demonstrate proportionally premium outcomes. Free + low-cost alternatives that achieve 80% of premium tool's outcomes outrank premium tools on this subscore.
Privacy / Data Posture
What does the brand do with your health, work, and behavior data? Data residency, third-party-sharing posture, breach history. Critical for any tool collecting biometric or productivity data.
Weighting & Scoring.
Why these weights? Behavior Change is heaviest because it's the singular reason any performance tool exists. Data Accuracy is second because behavior change without accurate measurement is just placebo. Friction / Adherence weighted heavily because the best tool unused is worse than the mediocre tool used daily. Cost-to-Outcome and Privacy / Data Posture complete the composite.