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The short answer: A tie at A (90/100), but for owners who care about supply chain over panel features alone, this is the most important comparison in our catalog. Castor & Pollux Organix is the only widely retailed kibble with USDA Organic certification on its top ingredients. Open Farm carries Certified Humane (raise standards for chicken welfare), ocean-wise certified fish, and per-batch traceability (you can look up the exact farm). Different certification frameworks, equally credible.

The scores

Castor & Pollux Organix Organix Organic Chicken & Brown Rice: A (90/100) — Organic Chicken, Organic Chicken Meal, Organic Oatmeal, Organic Barley, Organic Brown Rice.

Open Farm RawMix: A (90/100) — Chicken, Chicken Meal, Ocean Whitefish Meal, Pumpkin, Sweet Potato.

How the ingredients compare

The top-five ingredients reveal the formulation split between these two brands:

Castor & Pollux: Organic Chicken, Organic Chicken Meal, Organic Oatmeal, Organic Barley, Organic Brown Rice

Open Farm: Chicken, Chicken Meal, Ocean Whitefish Meal, Pumpkin, Sweet Potato

Both formulas earn the same v15 score, but the ingredient lineups tell different stories about how they got there — that is where the actual pick decision lives.

Where Castor & Pollux pulls ahead

USDA Organic at the top of the panel: USDA Organic is a federal standard with auditable enforcement — no synthetic pesticide residue on grain, no antibiotics or hormones in poultry, no GMO inputs. Open Farm uses non-GMO ingredients but does not carry the USDA Organic seal. Shop on Amazon →

Lower price for the certification tier: Castor & Pollux Organix runs roughly 15–25% below Open Farm RawMix per pound. For owners who care primarily about residue-free ingredients, this is the more accessible price point.

Grain-inclusive whole-grain base: Castor & Pollux carries organic barley, organic oatmeal, and organic brown rice — quality whole grains for owners avoiding grain-free formulations. Open Farm RawMix is grain-inclusive too, but mixes in higher legume content.

Where Open Farm holds its own

Certified Humane sourcing: Open Farm's chicken is Certified Humane — an independent third-party animal welfare audit. This is not a USDA-equivalent claim, but for owners weighing welfare standards alongside ingredient quality, it is the more substantive certification. Shop on Amazon →

Marine omega-3 from named fish meals: Ocean whitefish meal in the top five supplies marine EPA/DHA. Castor & Pollux relies on flaxseed for the omega-3 contribution, which carries the inefficient plant ALA-to-EPA conversion bottleneck.

Per-batch ingredient traceability: Open Farm publishes a lot-code lookup that maps every bag to the specific farms its ingredients came from. Few competitors offer this level of supply-chain transparency. Castor & Pollux's USDA Organic certification is auditable, but does not reach per-batch farm identification.

The bottom line

Both score A (90/100) and both lead the segment on supply-chain credentials — this is the only matchup in our catalog where certification frameworks, not ingredient quality, drives the choice. Castor & Pollux Organix wins on USDA Organic federal certification, lower price, and grain-inclusive whole-grain base. Open Farm wins on Certified Humane animal welfare, marine omega-3 from ocean-wise fish, and per-batch farm-level traceability. If you are organic-first, pick Castor & Pollux. If you are humane-and-traceability-first, pick Open Farm. Either way, you are feeding an A-tier kibble with supply-chain integrity that the rest of the segment cannot match.