Short answer: Labdoor buys products, sends samples to a lab, and publishes a grade for the product. That grade describes the sample they tested, not the bottle in your hand. ScanCheck is the free alternative for the question a grade cannot answer: does the batch number printed on my bottle have a published third-party certificate? Type or scan the batch number and the answer comes back in seconds, no account.
Two different questions
| ScanCheck | Labdoor | |
|---|---|---|
| Question answered | Is my batch covered by a published certificate? | How did a purchased sample of this product grade? |
| Evidence level | Batch-level (per production run) | Product-level (one sample, one point in time) |
| Source of data | Published third-party certification programs (Informed Sport and others) | Their own commissioned lab tests |
| Price | Free, no account | Free rankings; revenue via retail links |
| Coverage | Any brand that publishes batch certificates | Products they have chosen to buy and test |
Why batch-level matters
Supplements are made in production runs. Two runs of the same product can differ, which is exactly why certification programs test per batch and stamp certificates with the lot number. A product grade from a sample purchased last year says nothing about the run your bottle came from. If the brand participates in a certification program, the batch number on your label either has a published certificate or it does not, and that is checkable in seconds.
When Labdoor is the better tool
If you are choosing which product to buy and want an independent quality comparison across brands, a graded ranking is genuinely useful, and Labdoor's testing is independent of the brands. Use ScanCheck after the bottle is in your hand, or before buying, to confirm the specific batch is covered by a published certificate.
How to check your batch
Find the lot or batch number near the expiration date on your bottle. Open scancheck.app, enter it, and you get one of three answers: a matching published certificate (with a link to verify it at the source), a partial match worth confirming with the brand, or no published record, which is a transparency gap to ask the brand about.