High Transparency Matcha Brands

Why these brands qualify

Each brand in this collection is rated Tier 1 or Tier 2 in our transparency system: they publish some form of COA or lab result data publicly. Tier assignment is verified from brand websites at the time of last verification.

Useful for

Buyers who want brands that publish some form of lab data, those comparing transparency levels across the industry, and anyone who wants more than just a testing claim without published results.

Strongest in collection

Teafy — Publishes numeric COA (ppb resolution, named lab, dated)

Tier 1 vs. Tier 2 Transparency

Tier 1 brands publish numeric heavy metal results at ppb resolution with a named lab and test date — the gold standard. Tier 2 brands publish ppm-only results or non-detect results without ppb resolution. Both tiers are meaningfully more transparent than Tier 3 (claims testing, no public numbers) and Tier 4 (no public testing statement). The difference between Tier 1 and Tier 2 is the precision of the published data.

Why ppm-Only Results Are Less Informative

Parts per million (ppm) is 1,000 times coarser than parts per billion (ppb). A ppm non-detect result cannot rule out contamination at the ppb level. For example, a non-detect at 1 ppm means the lab couldn't detect lead above 1,000 ppb — which is well above California Prop 65 thresholds. ppm-only results are better than nothing, but they provide much less information than ppb-resolution data.

The Value of Any Published Data

Even Tier 2 transparency — ppm-only or non-detect results — is meaningfully better than no published data. It demonstrates that the brand has engaged with third-party testing and is willing to share some results publicly. Brands that publish any lab data are more accountable than brands that make testing claims without any public evidence.

What is the difference between Tier 1 and Tier 2 transparency?

Tier 1 brands publish numeric heavy metal results at ppb resolution with a named lab and test date. Tier 2 brands publish ppm-only results or non-detect results without ppb resolution. The key difference is precision: ppb is 1,000x more precise than ppm. Tier 1 data allows direct comparison against regulatory limits; Tier 2 data is less informative but still better than no published data.

Should I only buy from Tier 1 brands?

Tier 1 transparency is the gold standard, but Tier 2 brands are also meaningfully transparent. If a Tier 2 brand's ppm-only results show non-detect at a reasonable detection limit, that's useful information. The key is to understand what the published data does and doesn't tell you. Tier 3 and Tier 4 brands — which publish no data — are the ones to approach with the most caution.

How many matcha brands are Tier 1 or Tier 2?

In our current database, a minority of brands achieve Tier 1 or Tier 2 transparency. Most brands either claim testing without publishing results (Tier 3) or have no public testing statement (Tier 4). The brands in this collection represent the more transparent segment of the matcha market.

Can a brand move from Tier 2 to Tier 1?

Yes. A brand can improve its transparency tier by publishing more detailed lab results. Moving from Tier 2 to Tier 1 requires publishing numeric ppb results (not just ppm or non-detect) with a named lab and test date. We update tier assignments when brands publish new data.