Mercor vs DataAnnotation

Mercor and DataAnnotation both land on Depends.

Mercor

mercor.com

Analyzed October 8, 2026

Depends

Confidence: Medium

Buy if you're an AI lab that needs vetted domain experts and can absorb security and legal risk; workers get strong hourly rates but report deductions and dry spells.

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DataAnnotation

dataannotation.tech

Analyzed October 8, 2026

Depends

Confidence: Medium

Use it as a flexible side gig if you have in-demand skills (coding, STEM, law, writing) and don't mind an unpaid entry assessment.

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Mercor versus DataAnnotation
Compare	Mercor	DataAnnotation
Verdict	Depends	Depends
Best for	AI labs needing scarce domain experts	Skilled coders and STEM experts
Who it's not for	Teams handling sensitive data mid-lawsuit . breach and worker suits are active	Anyone needing stable full-time income
Privacy	Confirmed 2026 breach (~4TB) via LiteLLM attack; Meta paused work; worker lawsuits filed.^⁴	No public security page; one scanner blacklist warning; brand widely impersonated by scammers targeting applicants.
Support quality	Recurring deduction and payment complaints	Users publicly waiting on replies; pending onboarding
Public sentiment	Workers praise the pay and flexibility but report deductions, slashed rates, and uneven project availability.^⁹	Users say the platform is legit and pays, but complain about assessment gates, pending onboarding, and inconsistent weekly income.¹³
Biggest gotcha	Workers report hours deducted from paychecks after projects	Brand heavily impersonated . apply only via the official site, never pay to join

Pick Mercor when

AI labs needing scarce domain experts
Doctors, lawyers, consultants wanting AI-training side income
Buyers of high-value, low-volume expert work

When Mercor is not a fit

Teams handling sensitive data mid-lawsuit . breach and worker suits are active
Buyers wanting published, predictable pricing . enterprise rates are opaque
Workers needing steady full-time income . project gaps reported
Small teams needing simple hiring . this is enterprise-scale AI data supply

Pick DataAnnotation when

Skilled coders and STEM experts
Writers wanting flexible side income
Fully remote gig seekers

When DataAnnotation is not a fit

Anyone needing stable full-time income
People without a coding, STEM, or writing specialty
Applicants unwilling to sit unpaid assessments
Job seekers expecting benefits or employee status

Sources

Mercor quintuples valuation to $10B with $350M Series Ctechcrunch.com
news
Mercor targets $10B valuation as OpenAI, Meta, Tesla turn to its expertsbenzinga.com
news
How AI labs use Mercor to get the data companies won't providefinance.yahoo.com
news
Mercor says it is one of thousands of companies hit by the LiteLLM attackneowin.net
security
Workers Sue $10B AI Startup Mercor Over Alleged Data Exposuretechloy.com
security
Mercor 4TB data breach discussionreddit.com
security
Mercor Contractors Allege The AI Company Slashed Their Payreddit.com
review
AI Consultant Jobs . Earn $50-180/hrmercor.com
official
Trustpilot reviews of Mercortrustpilot.com
review
Mercor Reviews on Glassdoorglassdoor.com
review
Mercor Pricing blueprintusagepricing.com
official
DataAnnotation official sitedataannotation.tech
official
AI Training jobs- Data Annotation. Scam? (r/WFHJobs)reddit.com
review
Question About Job Opportunities (r/DataAnnotationTech)reddit.com
review
Tired of Failed Assessments & Pending Onboarding on Top AI Platformsfacebook.com
review
Remote, flexible side hustle? (ChooseFI forum)app.choosefi.com
review