No single ancestry test is the most accurate across the board. AncestryDNA, 23andMe, and MyHeritage each perform better or worse depending on your ethnic background, what you’re trying to learn, and whether you care more about ethnicity estimates or finding living relatives. The differences come down to database size, reference panel diversity, and how each company’s algorithm handles your specific heritage.
Why No Test Wins Every Category
Consumer DNA tests all use the same basic technology: a genotyping chip that reads hundreds of thousands of specific locations on your DNA. The chip hardware is similar across companies. What differs is the reference panel, which is the curated set of DNA samples from known populations that the company compares your results against, and the algorithm that interprets those comparisons. A company with more reference samples from West Africa will give you a more detailed African ancestry breakdown. A company with deeper Scandinavian data will split your Northern European results into finer regions.
This means accuracy is partly about you. Someone with predominantly European ancestry might get nearly identical results from all three major companies. Someone with mixed Indigenous American and East Asian heritage could see dramatically different breakdowns depending on which company has stronger reference data for those populations.
AncestryDNA: Largest Database, Best for Finding Relatives
AncestryDNA has the largest consumer DNA database in the world, with over 27 million samples as of 2025. That’s roughly ten times the size of its nearest competitor. For finding living relatives, this sheer volume matters more than anything else. The more people in the database, the higher your chances of matching with a second or third cousin you didn’t know about. Thirteen million of those users have also linked their DNA results to a family tree, which means you can often see exactly how a match connects to your family line.
For ethnicity estimates, AncestryDNA currently covers over 2,600 regions. Its algorithm updates regularly, and each update tends to sharpen regional distinctions. If your primary goal is genealogy (building a family tree, finding biological relatives, or understanding recent ancestry within the last few hundred years), AncestryDNA’s database gives it a practical edge that’s hard to ignore.
23andMe: Strongest for Health and Genetic Traits
23andMe covers slightly more regions than AncestryDNA (2,750+) and produces solid ethnicity estimates. But where it genuinely leads is health reporting. 23andMe is the only consumer DNA company with FDA-cleared genetic health risk reports, classified as a Class II medical device. These reports cover conditions including late-onset Alzheimer’s disease, Parkinson’s disease, celiac disease, hereditary hemochromatosis (iron overload), and several blood-clotting disorders.
FDA clearance means the company demonstrated that its genotyping for those specific variants is analytically valid, not that it screens for every mutation linked to a disease. The reports check for particular well-studied variants, so a negative result doesn’t guarantee you’re risk-free. Still, for someone who wants ancestry information alongside genuinely vetted health insights from a single kit, 23andMe occupies a unique space. Its database is considerably smaller than AncestryDNA’s, which limits relative matching, but it remains a strong option for ethnicity analysis paired with health data.
MyHeritage: Best for Certain Non-European Ancestry
MyHeritage DNA has a smaller database than both AncestryDNA and 23andMe, but it has notably strong representation for Middle Eastern, Jewish, and Scandinavian populations. If your family comes from these regions, MyHeritage may return more granular and meaningful ethnicity results than the other two. Its international user base also skews more heavily European and Middle Eastern, which can help with relative matching if your family roots are in those areas.
For people with primarily African, East Asian, or Indigenous American ancestry, no company currently offers the same level of regional detail that European ancestry gets. All three major companies have been expanding their reference panels, but gaps remain. If this applies to you, testing with more than one company (or uploading your raw data to a second platform) can give you a more complete picture.
Relative Matching: Where Size and Thresholds Matter
All consumer tests identify relatives by looking for shared DNA segments measured in centimorgans (cM). Close relatives, like siblings or first cousins, share large segments that are easy to detect accurately. The challenge is with distant relatives, where the shared segments get very small.
Segments under 10 cM can have false match rates as high as 85%. One study using manually phased data from 14 relatives found that 85% of segments under 5 cM were false matches. To deal with this, AncestryDNA updated its algorithm to exclude matches sharing less than 8 cM, cutting out a large number of false positives. Segments over 15 cM are considered highly reliable across all platforms.
In practical terms, this means every company is accurate for identifying relatives within about four or five generations (second to third cousins and closer). Beyond that, results become increasingly unreliable regardless of which test you use. If you’re searching for a biological parent or close family member, AncestryDNA’s larger database gives you the best odds of a match appearing, but the match itself will be equally reliable on any platform.
Y-DNA and mtDNA: Different Tests for Deeper History
Standard consumer tests from AncestryDNA, 23andMe, and MyHeritage all use autosomal DNA, which covers your full family tree but only reaches back reliably about five generations. If you want to trace a single paternal or maternal line much further back, you need a different type of test.
Y-DNA tests (available through FamilyTreeDNA) follow the direct father-to-father line and can identify paternal ancestors going back hundreds or even thousands of years. FamilyTreeDNA’s most advanced Y-DNA test scans tens of millions of locations on the Y chromosome and can assign you to a branch of the human family tree within the last 100 to 500 years. This is far more specific than the ancient haplogroups (3,000 to 10,000 years old) that basic Y-DNA tests return.
Mitochondrial DNA (mtDNA) tests trace the direct maternal line, mother to mother to mother. These are useful for confirming deep maternal lineage but can be harder to use for practical genealogy, since tracing female ancestors through historical records is often more difficult. Both Y-DNA and mtDNA tests answer fundamentally different questions than ethnicity estimates, so they complement autosomal testing rather than replacing it.
Third-Party Tools and Raw Data Uploads
Most companies let you download your raw DNA data file and upload it to third-party tools like GEDmatch or health interpretation services. This can be a cost-effective way to get a second opinion on your results without buying another test. But there are real accuracy concerns.
Raw data from consumer genotyping chips is incomplete. It reads specific locations rather than sequencing your entire genome, and some of those readings contain errors. When third-party tools interpret that data, those errors can cascade. Media reports have documented cases where people received alarming health results from third-party tools that turned out to be false positives upon clinical testing, leading to unnecessary emotional distress and follow-up costs. Third-party tools also vary widely in quality, scope, and data security.
For genealogy purposes, third-party matching tools are generally reliable for identifying close relatives, since the shared DNA segments are large enough that small errors don’t matter. For health-related interpretation, the margin for error is much higher, and any concerning result should be confirmed through clinical-grade testing.
How to Choose Based on Your Goals
- Finding living relatives or building a family tree: AncestryDNA’s 27-million-person database and family tree integration make it the strongest choice.
- Ethnicity estimates plus health reports: 23andMe is the only option with FDA-cleared health risk reports alongside detailed ancestry breakdowns.
- Middle Eastern, Jewish, or Scandinavian roots: MyHeritage has the deepest reference data for these populations.
- Deep paternal or maternal lineage: FamilyTreeDNA’s Y-DNA and mtDNA tests go far beyond what autosomal tests can reveal.
- Maximum accuracy overall: Testing with two companies and comparing results gives you the most complete and reliable picture, since each company’s algorithm and reference panel will catch things the other misses.
Ethnicity percentages will always shift slightly as companies update their reference panels and algorithms. A result showing 28% Scandinavian today might adjust to 24% next year. This doesn’t mean the test was wrong; it means the comparison data got more refined. The DNA you submitted hasn’t changed. Treat ethnicity percentages as educated estimates rather than fixed measurements, and focus on the broader regional patterns rather than small percentage differences between companies.