Best AI training platforms
Ranked from today's listings, not opinion. Platforms whose ownership we have confirmed from a source come first, then the ones with the most distinct openings. A job posted once per city counts once. Nobody pays for a place; see how we make money.
Most open work right now
- MeridialInvisible TechnologiesLaw, STEM, finance, coding, linguistics, safety and AI training#1 · 569 listings · ownership confirmedApplyGlobal
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review#2 · 537 listings · ownership confirmedOpen / self-serveRole dependent
- Prolific ParticipantsProlificResearch studies, behavioural data and AI evaluation/training tasks#3 · 436 listings · ownership confirmedWaitlistGlobal
- Welo DataWelocalizeMultilingual evaluation, AI safety, search relevance and annotation#4 · 280 listings · ownership confirmedOpen / self-serveGlobal
- SME CareersSuperAnnotateSubject-matter-expert AI training and evaluation#5 · 263 listings · ownership confirmedOpen / self-serveGlobal
- micro1 Experts Opportunitiesmicro1Professional, creative, scientific and technical AI training/evaluation#6 · 252 listings · ownership confirmedApplyGlobal
Best for your field
Counted from listing titles that name the field, so a platform that hires many lawyers outranks one that only says it does.
Software and coding
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review71 listings in this fieldOpen / self-serveRole dependent
- MeridialInvisible TechnologiesLaw, STEM, finance, coding, linguistics, safety and AI training41 listings in this fieldApplyGlobal
- Turing AI Advancement WorkTuringCoding, data science, model evaluation, voice and domain review30 listings in this fieldApplyGlobal
Law
- micro1 Experts Opportunitiesmicro1Professional, creative, scientific and technical AI training/evaluation46 listings in this fieldApplyGlobal
- AfterQuery ExpertsAfterQueryAgent evaluation, model training, writing, ML and professional-domain work8 listings in this fieldOpen / self-serveGlobal
- Mercor ExpertsMercorLaw, medicine, finance, engineering, operations and AI evaluation8 listings in this fieldApplyGlobal
Medicine and healthcare
- Prolific ParticipantsProlificResearch studies, behavioural data and AI evaluation/training tasks48 listings in this fieldWaitlistGlobal
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review28 listings in this fieldOpen / self-serveRole dependent
- AfterQuery ExpertsAfterQueryAgent evaluation, model training, writing, ML and professional-domain work18 listings in this fieldOpen / self-serveGlobal
Finance
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review24 listings in this fieldOpen / self-serveRole dependent
- AfterQuery ExpertsAfterQueryAgent evaluation, model training, writing, ML and professional-domain work15 listings in this fieldOpen / self-serveGlobal
- micro1 Experts Opportunitiesmicro1Professional, creative, scientific and technical AI training/evaluation14 listings in this fieldApplyGlobal
Science and maths
- MeridialInvisible TechnologiesLaw, STEM, finance, coding, linguistics, safety and AI training81 listings in this fieldApplyGlobal
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review67 listings in this fieldOpen / self-serveRole dependent
- Handshake AIHandshakeGeneralist and specialist AI evaluation and training projects50 listings in this fieldApplyRegion restricted
Writing and editing
- AlignerrLabelboxAI training, evaluation, coding, writing and specialist review42 listings in this fieldOpen / self-serveRole dependent
- MeridialInvisible TechnologiesLaw, STEM, finance, coding, linguistics, safety and AI training6 listings in this fieldApplyGlobal
- AfterQuery ExpertsAfterQueryAgent evaluation, model training, writing, ML and professional-domain work5 listings in this fieldOpen / self-serveGlobal
Languages and translation
- MeridialInvisible TechnologiesLaw, STEM, finance, coding, linguistics, safety and AI training220 listings in this fieldApplyGlobal
- SME CareersSuperAnnotateSubject-matter-expert AI training and evaluation47 listings in this fieldOpen / self-serveGlobal
- AfterQuery ExpertsAfterQueryAgent evaluation, model training, writing, ML and professional-domain work46 listings in this fieldOpen / self-serveGlobal
No degree or specialism yet? Start with the platforms that take anyone, or filter the full directory.
Frequently asked questions
What is the best AI training platform?
It depends on your field. Across 36 platforms with open listings today, those with confirmed ownership and the most distinct openings are Meridial, Alignerr, Prolific Participants, Welo Data, SME Careers, micro1 Experts Opportunities. The field lists on this page show who has the most work for lawyers, clinicians, engineers and others.
How does HumanSourcer rank these platforms?
Two facts from the registry and the daily listing collection: whether the platform's ownership is confirmed from a source, then how many distinct listings it has open. A job posted once per city counts once. No platform can pay for a place; see how we make money.
How often is this ranking updated?
Listings are collected daily from the platforms' public pages. Ownership and status are re-checked by hand, and every provider profile links to its source.
Which AI training platforms are best for beginners?
Platforms with open sign-up and general work, such as rating, labelling and data collection. The no-experience guide lists them.