The best autosomal DNA test depends on what you’re trying to learn. AncestryDNA has the largest customer database, making it the strongest choice for finding relatives and building a family tree. 23andMe offers the most detailed ethnicity breakdown, now covering over 4,000 geographic regions, and is the only major option with FDA-cleared health reports. FamilyTreeDNA is the most flexible for genetic genealogy tools and third-party uploads. There’s no single winner across every category, but most people will get the most value from either AncestryDNA or 23andMe.
How Autosomal DNA Tests Work
Every major consumer DNA test analyzes the same basic thing: hundreds of thousands of specific points in your genome called SNPs (single-letter variations in your DNA code). The companies compare your SNPs against their reference databases to estimate your ethnic origins, identify relatives who share DNA segments with you, and in some cases flag health-relevant genetic variants. The raw technology is similar across providers. What separates them is database size, the algorithms interpreting your results, and the features built on top.
AncestryDNA: Best for Finding Relatives
AncestryDNA’s biggest advantage is sheer scale. With over 25 million people tested, it has the largest consumer DNA database in the world. That matters because DNA matching is a numbers game. The more people in the pool, the more cousins you’ll find, and the closer those matches are likely to be. If your goal is connecting with biological family, filling in a family tree, or searching for a birth parent, AncestryDNA gives you the best odds.
Ancestry also integrates DNA results directly with its massive collection of historical records: census data, immigration documents, birth and death certificates. You can link a DNA match to a paper trail, which is uniquely powerful for genealogy. The ethnicity estimate covers a large number of global regions, though it tends to perform best for people with European ancestry simply because that’s where most of its reference samples come from. Users with roots in East Asia, South Asia, or Sub-Saharan Africa may find the regional detail less granular.
The main limitation is that AncestryDNA doesn’t offer health reports. It’s purely an ancestry and genealogy product. And unlike some competitors, it doesn’t provide tools for Y-DNA or mitochondrial DNA analysis, which trace specific paternal and maternal lines.
23andMe: Best for Ethnicity and Health
23andMe connects you to over 4,000 geographic regions, ethnolinguistic groups, and cultural identities, making its ancestry composition report the most detailed available. For people with East Asian heritage especially, 23andMe tends to outperform competitors. Users of Chinese descent, for example, report breakdowns distinguishing Southern Han from Northern Chinese and Tibetan populations, with results accurate enough to identify specific provinces. Korean users have reported province-level accuracy as well.
The health side is where 23andMe truly stands apart. It’s the only major consumer test with FDA-authorized genetic health risk reports, including screening for 44 variants in the BRCA1 and BRCA2 genes associated with increased risk of breast, ovarian, prostate, and pancreatic cancers. The FDA also authorized 23andMe to report on 33 pharmacogenetic variants, genes that influence how your body metabolizes certain medications. Beyond those cleared reports, the service includes carrier status reports (showing whether you carry a single copy of a variant linked to conditions like cystic fibrosis or sickle cell disease) and trait reports covering things like taste perception, hair texture, and facial features.
The database is smaller than Ancestry’s, with roughly 14 million customers tested. You’ll still find plenty of DNA matches, but fewer than you would on Ancestry. 23andMe also doesn’t integrate with historical genealogical records, so it’s less useful for deep family tree research.
One important note: 23andMe’s health reports are informative, not diagnostic. They screen for selected variants, not all possible mutations in a given gene. The BRCA report, for instance, covers 44 specific variants, mostly those most common in people of Ashkenazi Jewish descent. A negative result doesn’t mean you carry no BRCA risk. These reports are best used as a conversation starter with a healthcare provider, not a final answer.
FamilyTreeDNA: Best for Advanced Genealogy
FamilyTreeDNA occupies a niche that serious genealogists value. It’s the only major company offering dedicated Y-DNA testing (tracing the direct paternal line) and mitochondrial DNA testing (tracing the direct maternal line) alongside its autosomal test. These specialized tests can reach back dozens of generations along a single lineage, which is useful for surname projects, deep ancestry research, and confirming specific family connections that autosomal DNA alone can’t resolve.
FamilyTreeDNA also allows users to upload raw DNA data from other companies at no charge for basic matching, which means you can test with AncestryDNA or 23andMe and still search FamilyTreeDNA’s database. Its customer base is smaller than both major competitors, but it attracts a disproportionate number of dedicated genealogists, so the matches you find there are often people who’ve done extensive research on their family trees.
Which Populations Each Test Covers Best
No DNA test is equally accurate for every ethnic background. The precision of an ethnicity estimate depends on how many reference samples the company has from a given population. All three major companies perform well for people of European descent because that’s the best-represented group in their databases.
For East Asian ancestry, 23andMe consistently gets the strongest reviews from users. It distinguishes between Chinese regional populations, identifies Korean provinces, and has been expanding its Southeast Asian categories. AncestryDNA has improved its Asian coverage in recent updates but still tends toward broader categories like “Southern and Southeastern China” rather than province-level detail. For very specific breakdowns of Chinese ancestry, some users turn to WeGene, a Chinese company with a reference database built around East Asian populations.
For African ancestry, both AncestryDNA and 23andMe have invested in expanding their African reference panels, but results still tend to be less granular than European breakdowns. African Americans searching for pre-slavery geographic origins will get broad regional estimates rather than specific ethnic groups in most cases. Neither company can reliably pinpoint a single West African country of origin, though the estimates have improved year over year.
Ethnicity estimates from all companies update periodically as reference databases grow. A result you get today may shift in a year or two as the algorithms are refined.
Uploading Your Data to Other Services
One of the smartest moves you can make is testing with one company and then uploading your raw DNA file to others. Both 23andMe and AncestryDNA let you download your raw data. You can then upload it to FamilyTreeDNA for additional relative matching, or to third-party tools like Promethease for a detailed health report drawn from published biomedical research. Promethease accepts files from 23andMe, AncestryDNA, FamilyTreeDNA, and several other providers.
This approach lets you get the most out of a single test purchase. If you test with AncestryDNA for the largest matching database, you can still get health insights through a third-party upload rather than buying a separate 23andMe kit.
Privacy Differences Worth Knowing
DNA data is uniquely sensitive because it’s permanent and identifies not just you but your biological relatives. The major companies differ in how they handle law enforcement requests. Both AncestryDNA and 23andMe require a valid warrant or subpoena before releasing any customer data to police. FamilyTreeDNA took a different path: it was revealed in 2019 that the company had a voluntary agreement with the FBI allowing agents to upload crime-scene DNA and search for familial matches. After public backlash, FamilyTreeDNA switched to an opt-out model, meaning your profile is available to law enforcement searches unless you actively change your settings.
GEDmatch, a free third-party database popular with genealogists, moved to an opt-in model after its role in the Golden State Killer case drew scrutiny. Nearly 90% of GEDmatch profiles are now unavailable to law enforcement as a result. If privacy around law enforcement access matters to you, check the current policy of any service before uploading your data.
All three major companies let you delete your data and destroy your physical sample on request. Read the terms of service carefully regarding research consent, as some companies use anonymized customer data for internal or pharmaceutical research unless you opt out.
Quick Comparison
- Best for finding relatives: AncestryDNA, thanks to the largest database
- Best for ethnicity detail: 23andMe, with 4,000+ regions
- Best for health reports: 23andMe, the only option with FDA-cleared results
- Best for advanced genealogy: FamilyTreeDNA, with Y-DNA and mitochondrial testing
- Best for East Asian ancestry: 23andMe, with province-level accuracy for Chinese and Korean users
- Best budget approach: Test with one company, upload raw data to others
If you only buy one test, AncestryDNA is the strongest all-around choice for genealogy, while 23andMe is the better pick if you want both ancestry and health information from a single kit. Testing with one and uploading to the other’s ecosystem gets you the closest to having it all.