Compare · Outliyr vs Levels
Outliyr vs Levels.
Levels is the strongest glucose-led metabolic health program on the market, and it now reads your ring and your watch too. What it does not do is run the trial. Outliyr takes glucose, sleep, HRV, supplements, and protocols and puts each one through a designed experiment with a graded verdict.
The difference in one line
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Entry price
- Outliyr
- Free, Pro $15/mo founder
- Levels
- $499/yr Core, sensors billed separately
01Quick answer
Levels if your goal is metabolic health and CGM-led food coaching. Outliyr if your goal is everything else too.
Levels Core is $499/yr and Complete is $1,999/yr, with Dexcom Stelo sensors billed separately. They include a coach- or program-driven metabolic protocol, AI photo meal logging, lab panels and lab upload, and clinician or nutritionist support depending on plan. Levels has widened its intake well beyond glucose: it now reads Oura, Whoop, Garmin, Strava, and Apple Health. What it still does with all of it is analysis and programs. Outliyr is structurally different: it joins wearables, labs, supplement changes, protocols, and daily context, then runs a designed trial on that joined dataset and returns a verdict.
02Where 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.
03Where 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 versus fed training, hydration, light exposure, all interact. Pulling on one thread changes others. Levels now sees most of those threads and interprets them through a metabolic lens. The gap is not what it can see. It is that seeing a pattern and testing whether an intervention caused it are two different jobs, and only one of them settles an argument.
Three concrete differences:
- 01 The experiment itself.
Levels reads your data and shows you patterns in it. Outliyr runs a designed trial on top of that data: a derived baseline, a schedule, watch metrics for effects you did not nominate, and a verdict graded Experimental, Under test, or Confirmed.
- 02 Supplement and protocol stack.
Every supplement, peptide, and protocol cycle is tracked with dose, timing, and cost in Outliyr, and each one can become the thing being tested. In Levels it is not the focus.
- 03 Any metric can be the endpoint.
Outliyr will run an experiment on sleep efficiency after a magnesium change just as readily as on post-meal glucose response, and grade each endpoint separately.
04Side-by-side
Scroll the table sideways →
| Feature | Outliyr | Levels |
|---|---|---|
| Primary scope | Whole-body self-experimentation | Glucose-led metabolic health |
| Pricing entry | Free, Pro $15/mo founder | $499/yr Core, sensors billed separately |
| Wearables supported | Oura, Whoop, Ultrahuman, Apple Health, Health Connect | CGM, Apple Health, Oura, Whoop, Garmin, Strava |
| CGM | Reads CGM glucose through Apple Health | Core data source, Dexcom Stelo sensors |
| 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, with a graded verdict | No experiment engine; programs and pattern analysis |
| Post-trial monitoring | Yes (Evidence Watch) | No |
05How 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 designed 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 people pick one based on which lens they're optimizing through this season.
The other consideration is price. Levels Core at $499/yr, before sensors, is several times 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 pick.
And glucose is not Levels-only territory. Your CGM readings reach Outliyr through Apple Health, land on the same timeline as everything else, overlay on fasts, and pin glucose, ketones, and GKI to the iOS lock screen.
Start free, or lock founder pricing while seats remain.
The Free tier never expires and runs unlimited experiments. Founder pricing holds for as long as the membership stays active.