Alignerr overview
What Alignerr offers contributors, how it relates to Labelbox, and what to verify before you apply.
PlatformAI training platforms
Compare well-known platforms that hire freelancers for data annotation and RLHF-style tasks.
These listings link to our platform guides on AI Trainer Courses. Each guide explains what that marketplace publishes about contributor work and what you should confirm on the vendor’s own site before you apply. We do not use affiliate tracking links, and we do not paste pay tables here unless a page cites a dated public source.
Platform directory
Open the overview that matches the signup page you are researching:
- Alignerr — contributor programs for evaluation and related AI data work.
- DataAnnotation.tech — freelance annotation and linguistics-style tasks.
- Mercor — expert marketplace with AI training and assessment projects.
- Outlier AI — skills-based screening and project work (verify current branding on Outlier’s site).
- Prolific — academic and commercial studies; some studies feed model evaluation workflows.
- Scale AI — enterprise data and model-evaluation programs via Scale and related contributor surfaces.
- Appen — long-running crowd projects via Appen Connect and related contributor flows.
- Toloka — skill-tiered microtasks on the Toloka AI crowd platform.
If two names sound similar, read both overviews—vendors rebrand funnels and subsidiary products often.
Guides and context
Pair a platform page with the background material when you are new to the field:
- What is data annotation?
- What is RLHF?
- How to become an AI trainer
- Where to apply for AI training jobs
- DataAnnotation vs Outlier
- AI trainer pay
- AI training jobs for coders
Return to the home page for how this directory fits together, or use Contact to report a broken vendor link or an outdated citation. When you are deciding where to spend screening time, compare platforms here first, then apply through exactly one official signup flow at a time so your answers stay accurate.
Pages in this section
Appen overview
How Appen’s crowd platform fits AI data work, what contributors should verify, and how it differs from RLHF-first marketplaces.
PlatformDataAnnotation.tech overview
How DataAnnotation.tech describes its contributor program and what to check before onboarding.
PlatformIs Outlier AI legit?
How to vet Outlier AI using public policies, payment docs, and complaint patterns—without hype.
ReviewMercor overview
How Mercor lists AI expert roles, what its marketplace claims, and what to check before assessments.
PlatformOutlier AI overview
What Outlier AI is, who it is for, and what to verify before you apply.
PlatformProlific and AI-style research tasks
When Prolific fits AI-related paid work—and when a dedicated training marketplace is a better match.
PlatformScale AI and Remotasks overview
How Scale AI positions contributor work and how Remotasks fits in for task-based earners.
PlatformToloka AI overview
How Toloka’s crowd platform lists AI labeling tasks, skill tests, and pay—and who should use it alongside other marketplaces.
PlatformFAQ
Do these platforms guarantee income?
No. Each vendor sets eligibility, task volume, and pay. Use their official docs only.
Are these full-time jobs?
Most links here are freelancer marketplaces with per-task or per-project pay, not W-2 roles.
How should I read the platform pages on this site?
Each overview lists what to verify on the vendor's website—countries, screening, payout timing, and task types. We link sources where we note specifics; open the live help center before you rely on any number.
Compare AI training platforms
Pay, requirements, and payment methods for each platform, with sources.
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