OK vs Star-K Kosher Certification: What's the Difference?

OK Kosher and Star-K are two of the major international kosher certification agencies. OK, founded in 1935 and headquartered in Brooklyn, is closely associated with the Chabad community and certifies products in over 100 countries. Star-K, chartered in 1947 in Baltimore, is known for technical kashrus work and appliance certification. Both are universally accepted, and both hold to the same fundamental standard.

Side-by-side comparison

OK Kosher in brief

OK Kosher dates to 1935 and grew substantially under Rabbi Berel Levy, with close ties to the Chabad-Lubavitch community. Today it is one of the largest agencies in the world, certifying industrial products, food service, and restaurants across more than 100 countries. Its designations follow the standard pattern: plain OK for pareve, OK-D for dairy, OK-M for meat, OK-P for Passover, with a cholov yisroel option on dairy.

Browse OK-certified restaurants on Kosher Connect.

Star-K in brief

Star-K began in 1947 as the Orthodox Jewish Council of Baltimore, the city's communal Vaad Hakashrus, and expanded internationally in the decades since. Rabbi Moshe Heinemann has served as its Rabbinic Administrator since 1971. Beyond food, Star-K certifies home appliances and industrial food chemicals, and it invests heavily in consumer education: a hotline that fields more than 100,000 questions a year and the long-running Kashrus Kurrents newsletter.

Browse Star-K certified restaurants on Kosher Connect.

Watch the symbols

Both agencies use the letter K, which trips people up. OK's mark is a K inside a circle. Star-K's is a K inside a star. A plain letter K on packaging, with no circle or star, belongs to neither agency and is not a registered hechsher. When in doubt, look for the full symbol.

Where they differ in practice

• Community roots. OK grew out of the Chabad world in Brooklyn. Star-K grew out of Baltimore's communal kashrus structure. Both now serve every community.
• Appliances. Star-K runs the best-known appliance certification program. OK's work centers on food and beverage.
• Dairy options. Both certify dairy at more than one standard. If cholov yisroel matters in your home, check the individual product. Our cholov yisroel vs cholov stam explainer covers the distinction.
• Consumer resources. Star-K's hotline and publications give it a direct line to consumers. OK publishes its own kosher education materials.

None of these differences change what lands in your cart. Either symbol means reliable certification.

Frequently asked questions

Is OK or Star-K more widely accepted? Both are universally accepted across Orthodox communities. Neither needs to be second-guessed. Are OK and Star-K stricter than the OU? No agency among the majors is a stricter or looser version of the others. They agree on the fundamentals and differ only in rare technical margins. Can one product carry both symbols? Products normally carry one primary certification, though a certified item often contains ingredients certified by other agencies. Does Star-K certify restaurants outside Baltimore? Yes. Its establishment certification reaches well beyond Maryland, though Baltimore remains its home base.

Finding certified restaurants

Kosher Connect shows the certifying agency on every listing. Compare OK and Star-K restaurants, browse Baltimore or Brooklyn, or open the explore page.

Related reading: OU vs OK kosher certification.

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Sources & references

• OK Kosher: About - The agency's official history and scope
• Star-K: About Us - Founding, headquarters, scope, and services, verified against the agency's official site
• Kosher Connect certification directory - Agency profiles and certified restaurant listings