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About VytrixSolo founder · Vytrix

One person. Four years of research. One app.

Vytrix is an independent Dutch app that makes sources, assumptions and limitations visible. This way you can judge for yourself what an insight does and does not say.

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Why Vytrix exists.

In 2022 I started tracking how much I benched, how much I weighed, and what I ate. On four different apps. One for strength training, one for nutrition, one for sleep, one for my heart rate. Neither app talked to the other.

Worse still, the calculations were wrong. Calorie goals without source. Strength scores that were not explained. Recovery numbers that came out of the blue. I wondered: how do I know this is correct?

Four years later, that is the core of Vytrix: bringing together training, nutrition, body weight and recovery context, with visible sources, assumptions and limitations. Some parts use published formulas; others are transparent Vytrix indicators.

It's not the biggest fitness app in the world, and it doesn't need to be. It's just meant to make your own progress easier to understand.

How we create content.

Vytrix is responsible for the articles and exercise explanations on this website. We distinguish between explanations about the app, published sources and our own practical implementation. We will only mention an external review once it has been completed.

01 · Sources
Sources and assumptions visible
We link calculations and substantive claims to the best available sources and indicate where an outcome is an Vytrix implementation or estimate.
02 · Review status
Review status visible
For nutrition and health content, we show per page who checked the content and when. As long as no external expert review has been completed, we will mention this explicitly.
03 · AI usage
Assist, not a replacement
We use AI tools for research and developing texts. In the substantive explanation we mention the sources and limitations; AI use in itself is not evidence of a claim.
04 · Corrections
See something wrong? Mail.
You can submit a correction to the articles. If you see an error or have a better source, please let us know.

What we stand for.

Transparency
Open formulas
Each calculator shows its calculation live, with variables filled in. No black box ever.
Evidence-based
Source and limitation
We show which source, assumption or own implementation is behind an outcome.
Choose yourself
Start for free, expand in a targeted manner
With Free you can track training, nutrition and progress. Pro adds extra features. The coaching portal is still under development.
Privacy conscious
Privacy by default
Primary Supabase database, Auth and Storage in AWS eu-west-1 (Ireland). Additional processors are listed in the current subprocessor list.

External review — under construction.

We are looking for independent reviewers for nutrition, recovery and other health content. A name, title and review date will only appear after the review has been completed and publication with name has been approved. Would you like to contribute, please contact us.

Sports nutrition
Reviewer wanted
Open position for a registered dietitian or sports nutritionist. No external review published yet. Pitch yourself →
Strength training
— open position —
We are still looking for an external reviewer for strength content (PhD/MSc Strength & Conditioning). Pitch yourself →
Sleep & recovery
— open position —
Reviewer for recovery, sleep tracking and stress content. Pitch yourself →
Endocrinology
— open position —
For hormone-related content (cycle tracking, thyroid, age effects on metabolism). Pitch yourself →
Ready?

Meet Vytrix.

One app for your entire body. Now available for iPhone and Android.