About StrengthInsight
Last updated: 3 October 2026
StrengthInsight is an independent publication about fitness wearables and the data they produce. We are a small site with no institutional affiliation and no commercial relationship with any manufacturer we cover. Here is what that means in practice.
What this site is for
The wearable market has a specific and persistent problem. A large share of the articles comparing fitness trackers are written by people who own none of them, quote no sources, and describe testing they never did. The reader has no way to tell from the outside which is which, and the category's most confident claims are frequently its least supported.
StrengthInsight exists to be the opposite of that. We compile from sources you can check: vendor documentation, published research, and stated arithmetic. Where a vendor makes a claim, we treat it as a claim rather than a finding. Where an effect size is small, we say it's small.
We are deliberately narrow. We would rather be obviously useful about a small number of questions than broadly vague about many:
- What wearables actually measure — and how each metric is derived, including the cases where the derivation is proprietary or estimated rather than measured.
- How those platforms compare — on documented capability, not on impressions.
- How to read your own training data — the arithmetic and methods that turn a set of logs into decisions, most of which need no device and no subscription.
What we don't do
We do not claim to have tested devices we don't own. If a guide describes how a tracker behaves, it is describing documented behaviour, published third-party testing, or our own reasoning — and the guide says which. Our editorial standards set this out in full.
We also don't:
- Publish first-hand product reviews dressed up as testing we've done.
- Report correlation figures we cannot trace to a source, or present an illustrative example as though it were a measurement.
- Give medical advice. Wearable recovery and readiness scores are not clinical measurements.
- Accept payment for coverage. No vendor has seen a guide before publication or can request changes.
- Collect personal data. There are no accounts, no newsletters and no tracking of readers beyond aggregate analytics.
How the site makes money
Affiliate commissions on a small number of product links, and nothing else. There are no sponsors, no subscription, no advertising network and no data sales. The full arrangement — including what affiliate revenue does affect — is set out on our disclosure page, and we'd rather you read that than take it on trust.
Being straightforward about the limits: coverage is not neutral. We write about wearables we can link to, which is part of why there's more here about consumer trackers than about laboratory equipment. That doesn't shape conclusions within a piece, but you should know it shapes the field of view.
How we handle errors
We get things wrong. When we do, we correct it on the page rather than quietly editing, and material corrections are dated at the top of the guide. If a correction changes a conclusion we say so explicitly.
If you think something here is wrong, tell us with the URL and what you believe is incorrect. If we're right and you're wrong, we'll say so and explain why — that's a useful outcome too. Readers have caught real errors in the strength-data guides, particularly around formula choice and where plateau thresholds come from.
Some history
StrengthInsight began as a small product — a tool that read workout screenshots and built progression charts — built because it seemed like a gap existed between what strength trackers logged and what a lifter needed to know. The tool has since been retired, and six guides written to support it have been removed rather than left to point at something that isn't there.
What survived the pivot is the part that was genuinely worth having: the accumulated research on how these devices measure things, what the numbers mean, and where the marketing and the methodology diverge. That is what this site now exists to publish, and the reason it can be useful without asking you to trust us on faith.
If you followed an old guide and landed here looking for the tool, this page explains what happened to it.
Affiliations
StrengthInsight is independent. It is not affiliated with, endorsed by, or sponsored by WHOOP, Fitbit, Garmin, Apple, Oura, Hevy, Strava, Amazon, or any other company whose products we cover. Product names and trademarks belong to their respective owners and are used here to identify the products being discussed.
Contact
Corrections, disagreements and questions all go to support@strengthinsight.app. A small site reads everything that arrives.