The short answer
Choose SuppLab if you specifically want a randomized 21-day take-or-skip protocol and your supplement is suitable for that pattern.
Choose Dosette if you prefer longer planned on and off phases, want supplements and prescribed medicines visible in the same routine, or use an iPhone that cannot run iOS 17.
Neither approach can turn one person's phone log into clinical proof. The useful question is which structure fits the supplement, outcome and routine you actually need to track.
Feature and method comparison
| Area | Dosette | SuppLab |
|---|---|---|
| Experiment structure | Planned phases. The default is two weeks on, two weeks off, repeated once. | A randomized 21-day schedule of take and skip days. |
| Main comparison | Longer on and off blocks, with each qualifying block contributing one average. | Take days compared with skip days across the randomized schedule. |
| What you can track | Subjective daily indicators plus selected Apple Health indicators. | Subjective check-ins plus selected Apple Health indicators. |
| Medicines | Supplements and medicines can share one routine. Prescribed medicines are excluded from experiments. | Its public listing describes supplement experiments and does not advertise medicine logging. |
| Privacy | No account. Core records and analysis stay on the device. App Store label: Data Not Collected. | No account or backend. App Store label: Data Not Collected. |
| Compatibility | iOS 15 or later. English, French, German and Spanish. | iOS 17 or later. English and Turkish. |
| Download model | Free download with optional in-app purchases. | Free download with optional in-app purchases. |
The biggest difference: blocks or randomized days
SuppLab says it randomly assigns take and skip days across 21 days. Random assignment can help reduce the link between a person's routine and whether a dose was taken. Its fit still depends on whether day-level changes are plausible and whether switching between take and skip days is appropriate.
Dosette takes a different approach. Its default guided experiment uses two weeks on, two weeks off, then repeats that sequence once. The main result compares qualifying blocks rather than treating an isolated missed day as a clean off-day.
Dosette chose longer blocks because onset and carryover can make day-level comparisons hard to interpret. Longer phases are not automatically better. They trade more time for a clearer separation between sustained periods. Randomized days trade that separation for better protection against predictable routine effects.
How the result is presented
SuppLab's listing promises a decision card that says keep it, drop it or test longer. Dosette is deliberately more reluctant to turn a personal association into a decision. It shows the direction and consistency of the pattern, surfaces confounds, and can conclude that there is not enough comparison data.
If you want a direct verdict, SuppLab's presentation may suit you better. If you prefer the app to keep uncertainty visible and make you interpret the result in context, Dosette is built around that choice.
Apple Health and daily check-ins
Both apps can combine a short subjective check-in with selected Apple Health indicators. Their public materials mention overlapping measures such as sleep, heart rate variability, resting heart rate and steps.
That reduces manual logging, but an automatically recorded number is not automatically meaningful. Pick an outcome that matches the reason for the experiment. A sleep supplement, for example, might call for both a consistent morning sleep-quality rating and a suitable sleep measure from Apple Health.
Privacy is a tie on the public evidence
Both App Store pages currently show Data Not Collected. Both products say there is no account and that health records stay on the iPhone. Privacy is therefore a shared strength, not a reason to favour one without looking at how the experiment itself works.
You still control Apple Health access through iOS and can choose which indicators an app may read.
Medicines need a separate safety boundary
Dosette lets you log supplements and prescribed medicines in one routine, but it does not allow prescribed medicines into guided experiments. It will not suggest creating an off-period for them.
Do not start, stop or change a prescribed medicine to create comparison data. Ask your pharmacist or prescriber about any treatment change. The same caution applies to a supplement when taking a break may not be safe or appropriate for you.
Which app should you choose?
- Choose SuppLab for its randomized daily protocol, concise decision cards and supplement-focused workflow.
- Choose Dosette for longer repeated phases, explicit confound and uncertainty handling, combined supplement and medicine logging, or iOS 15 and 16 support.
- Choose neither for medical decisions. These are personal tracking tools, not substitutes for clinical evidence or professional advice.
Before downloading either one, decide what “working” means, whether an off-period is suitable, and whether your chosen outcome could reasonably change within the app's experiment schedule.
Sources and update policy
Dosette details come from the Dosette App Store listing and its published methodology. SuppLab details come from the SuppLab App Store listing and SuppLab product page. Product features can change. This page records what those sources said on 11 September 2026.
Want to use longer phases?
Download Dosette free on the App Store to track a routine, choose the indicators that matter to you and run a guided supplement experiment.
For a method-first explanation, read how to tell if a supplement is actually working.
Dosette is not a medical device. It does not diagnose, recommend doses or tell you to start or stop treatment.