Compare · Outliyr vs Levels
Outliyr vs Levels.
Levels is the strongest glucose-led metabolic health program on the market. Outliyr is whole-body self-experimentation across glucose, sleep, HRV, supplements, and protocols. Different scope, different price, different best-fit user.
Quick answer
Levels if your goal is metabolic health and CGM-led food coaching. Outliyr if your goal is everything else too.
Levels Core is $41/mo ($499/yr) and Complete is $167/mo ($1,999/yr). They include a coach- or program-driven metabolic protocol with CGM data, Apple Health integration, lab and DEXA upload, and clinician/nutritionist support depending on plan. The product is tightly designed around metabolic health as the entry point. Outliyr is structurally different: a horizontal self-experimentation OS for wearables, labs, supplement changes, protocols, and daily context, then runs experiments on the joined dataset.
Where Levels wins
Levels is the best on-ramp for glucose-led optimization.
If your goal is "I want to learn how my body responds to food, in real time, with a coach holding my hand," Levels is built specifically for that. The CGM-first product UX, the food response visualizations, the glucose-anchored coaching prompts, and the program structure are tighter than anything Outliyr does for metabolic health alone. For someone whose primary worry is metabolic dysfunction, glucose variability, prediabetic markers, or insulin sensitivity, Levels is the right starting point and the price reflects the included program guidance.
Levels also benefits from a strong clinical narrative around metabolic health that resonates with users who want a single defining story for their optimization work, rather than a horizontal "everything matters" platform.
Where Outliyr is structurally different
Most high performers aren't optimizing one variable.
The reality of self-experimentation for someone running a serious optimization stack is that glucose is one of ten variables that matter. HRV, sleep efficiency, recovery, deep sleep minutes, RHR, training load, supplement timing, peptide cycles, fasted vs fed training, hydration, light exposure, all interact. Pulling on one thread changes others. Levels is built to optimize one thread very well; Outliyr is built to run the experiment on all of them simultaneously.
Three concrete differences:
- Wearable breadth. Outliyr supports direct Oura, Whoop, and Ultrahuman integrations, plus Apple Health and Health Connect intake for compatible devices and apps. Levels is glucose-anchored.
- Supplement and protocol stack. First-class in Outliyr; not the focus in Levels.
- N-of-1 experiment engine across any metric. Outliyr will run an experiment on sleep efficiency after a magnesium change just as readily as on post-meal glucose response.
Side-by-side
| Feature | Outliyr | Levels |
|---|---|---|
| Primary scope | Whole-body self-experimentation | Glucose-led metabolic health |
| Pricing entry | Free, Pro $15/mo founder | $41/mo ($499/yr) Core |
| Wearables supported | Oura, Whoop, Ultrahuman, Apple Health, Health Connect | Apple Health + CGM |
| CGM | Not a direct integration | Core data source |
| Supplement / protocol stack | First-class | Not the focus |
| Coach / clinician | No (AI Personal Scientist) | Yes, included by tier |
| N-of-1 experiments | Across any metric | Glucose-anchored |
How they work together
Run Levels for glucose-led coaching. Run Outliyr for everything else.
If metabolic health is the priority and you want a coach in the loop, Levels is the cleaner pick. If you want one platform that runs experiments across connected wearables, supplements, labs, and protocols, Outliyr is built for that. The two are not exclusive: you can run Levels for the metabolic program and Outliyr for the wider self-experimentation surface, but most users pick one based on which lens they're optimizing through this season.
The other consideration is price. Levels Core at $41/mo is roughly 3x Outliyr Pro founder pricing at $15/mo, which is the right tradeoff if and only if the included program coaching is the value you want. If you're a self-directed operator who already knows what to test and just wants the instrument, Outliyr is the better pick.