Data as of Oct 14, 2026A topic in RLHF Data Collection & Training Platforms.
Reviewed by Dimitry Apollonsky
Mentioned in · Jul 7 – Oct 14, 2026
ChatGPT SearchOct 14, 2026
If you're planning to crowdsource reinforcement learning from human feedback (RLHF), you want a provider that can recruit, train, calibrate, manage, and quality-check human raters who compare AI responses and select the better one.
The strongest starting points are Scale AI, Surge AI, and Appen. Other options depend on whether you want to manage the crowd yourself or outsource the entire operation.
1. Scale AI
(Best starting point for managed scale)
A strong candidate for enterprise-scale preference ranking, managed annotation operations, and complex AI evaluation. Ask about workforce management, rater calibration, expert coverage, and quality guarantees.
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2. Surge AI
Worth evaluating for demanding preference-ranking tasks where rater quality and nuanced judgments matter. Ask about dedicated project management, specialist annotators, and inter-rater agreement.
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3. Appen
A particularly relevant option for managed human-feedback programs and specialist raters across technical and professional domains. Appen documents RLHF preference-ranking services and a case study with Cohere involving 200 vetted contributors.
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4. Toloka
Consider it for distributed annotation workflows and multilingual human evaluation. Confirm current service availability, since its offerings and operating model may change.
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5. Prolific
Best to investigate if you want to recruit research participants and retain more control over task design, sampling, and study execution. It is more participant-platform-oriented than a fully outsourced RLHF operation.
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| Your requirement | Shortlist |
|---|---|
| Outsource crowd management end to end | Scale AI, Surge AI, Appen |
| Domain experts for coding, math, law, or medicine | Scale AI, Appen, Toloka |
| Global or multilingual workforce | Appen, Toloka |
| Recruit participants and manage the study yourself | Prolific |
| Build and control your own annotation workflow | Toloka |
These are suggested fits based on published service descriptions, not independently verified quality rankings.
For preference-ranking data, ask each provider about:
My recommendation: Start by requesting proposals from Scale AI, Surge AI, and Appen. Add Toloka if you want to compare a more platform-driven approach with managed services.
One question that would narrow the shortlist considerably: Are you looking for a fully managed service that runs the crowd for you, or a platform where you recruit and manage raters yourself?
When crowdsourcing Reinforcement Learning from Human Feedback (RLHF) data—specifically for pairwise or listwise preference ranking—managing the crowd team requires specialized workforce operations, quality assurance (QA), and rubrics calibration.[](https://annoticaagency.com/services/rlhf-preference-ranking)
Organizations generally choose between fully managed enterprise vendors (who supply and manage the crowd/experts end-to-end) or annotation platforms (where you use their software to manage your own crowd).
These companies provide the platform, recruit the crowd or domain experts, manage the project/quality leads, and handle the throughput:[](https://annoticaagency.com/services/rlhf-preference-ranking)
If you prefer to recruit your own evaluators or tightly control the UI and routing while using software to track quality, use data engine platforms:
Are you looking to outsource the entire operation to an agency, or do you need a software platform to manage internal/freelance annotators you are hiring yourself?
You're looking for a managed human-feedback workforce for RLHF preference ranking — a service that recruits or supplies crowd workers, trains them on your rubric, manages task execution, monitors quality, and delivers preference labels for model training.
The key distinction is whether you want a vendor to run the entire operation for you or a platform that gives you access to raters while you manage the work yourself.
1. Toloka — managed crowd and expert workforce
(Strong match)
Best starting point if you want a workforce provider with operational support. Toloka explicitly supports RLHF/DPO preference collection, AI-trained annotators, domain experts, and managed data services.
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2. Appen — large-scale managed annotation
A good fit when you need a vendor to recruit, vet, onboard, and deploy human raters. Its RLHF offering specifically covers pairwise preference ranking and expert feedback in fields such as STEM, law, medicine, and finance.
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3. OpenTrain AI — managed program or direct hiring
Particularly relevant if you want a dedicated team to work inside your existing annotation tooling. It advertises rater sourcing, screening, onboarding, ongoing QA, and a full-service managed RLHF option.
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4. Turing — technical and expert-heavy RLHF
Worth evaluating for coding, reasoning, STEM, and other tasks where general crowdworkers may not have the expertise needed. Turing offers human-data services for RLHF, supervised fine-tuning, and DPO. Confirm the specific workforce-management scope for your project.
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5. Prolific — participant sourcing and preference collection
Best if you need verified human participants, diverse populations, or domain specialists and can handle more of the task design and operational workflow yourself. Its RLHF offering supports preference data collection and API integration.
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My initial shortlist would be Toloka, Appen, and OpenTrain AI for your specific requirement: someone else managing the raters rather than simply providing a crowdsourcing platform. Turing is worth adding if the task requires specialist technical judgment.
When evaluating vendors, ask whether they handle all of the following:
Are you looking for:
1. How much management do you want to outsource?
Fully managed — vendor runs the workers, QA, and daily operations
Workforce platform — I manage tasks and workflows myself
Hybrid — vendor supplies and trains workers, I manage the project
2. What scale are you targeting?
Pilot — under 10,000 comparisons
Ongoing — 10,000 to 1 million comparisons
Large-scale — over 1 million comparisons
3. Who should do the ranking?
General crowdworkers following a rubric
Technical experts — coding, math, or reasoning
A mix of generalists and specialists
[Find the best-fit vendors]
Google AI ModeOct 14, 2026
Managing crowd workers for RLHF (Reinforcement Learning from Human Feedback) preference ranking requires robust quality control, clear guidelines, and specialized domain expertise.[](https://www.annotera.ai/blog/rlhf-human-annotation-guide/)[[2](https://annoticaagency.com/services/rlhf-preference-ranking)](https://annoticaagency.com/services/rlhf-preference-ranking)
Managed service providers and platforms specialize in recruiting, training, and managing crowd workforces specifically for pairwise ranking, SFT data creation, and reward model alignment:[](https://www.troveo.ai/resources/rlhf-data-providers)[[2](https://annoticaagency.com/services/rlhf-preference-ranking)](https://www..ai/services/rlhf-services/)
For crowdsourced RLHF (reinforcement learning from human feedback), you want vendors that can recruit, train, manage, and quality-control human raters for preference-ranking tasks — typically comparing two AI responses and selecting the better one.
The strongest starting shortlist is Scale AI, Surge AI, Appen, Toloka, and Turing. Other options include OpenTrain, Invisible Technologies, and Prolific, depending on whether you need a fully managed team or access to a pool of workers.
1. Scale AI
(Strong first choice)
Best for large enterprise RLHF programs. Offers managed data operations for pairwise preference ranking, model evaluation, safety, and alignment.
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2. Surge AI
Best for high-quality preference judgments and nuanced evaluations. Worth contacting for managed raters, specialized reviewers, and complex ranking rubrics.
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3. Appen
Best for large, multilingual worker pools and projects needing domain-qualified annotators. Its described services include specialist RLHF, comparative feedback, and multi-turn evaluation.
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4. Toloka
Best for flexible crowdsourcing and scalable preference-labeling workflows. Offers general annotators, domain experts, task-level quality controls, and RLHF-related data services.
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5. Turing
Best for coding, STEM, and technical preference ranking. Offers human-data services spanning RLHF, supervised fine-tuning, and direct preference optimization.
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6. OpenTrain AI
Explicitly offers preference-ranking and scoring services, with options to hire pre-vetted raters or request an end-to-end managed program.
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7. Invisible Technologies
Worth investigating if you want an operations partner to coordinate people and complex workflows rather than just buy annotation software. Confirm the precise preference-ranking service and workforce scope.
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8. Prolific
Best for recruiting research participants for preference studies and human evaluation. It is more of a participant-recruitment option than a turnkey managed RLHF operation, so your team may need to handle training, workflow, and adjudication.
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| Your requirement | Start with |
|---|---|
| Fully managed, high-volume preference ranking | Scale AI, Appen |
| Nuanced judgments and high-quality feedback | Surge AI |
| Flexible crowdsourcing and multilingual coverage | Toloka |
| Coding or STEM expert raters | Turing |
| Managed program or direct access to specialist raters |
These are fit-based recommendations, not independent quality rankings. The distinction between a managed service and a platform matters: not every vendor supplies a dedicated project manager, trains every worker, or handles all quality assurance.
For your initial request for proposal (RFP), ask each vendor:
Public pricing is generally not disclosed for the major managed providers, so request quotes using the same task specification and quality targets.
My recommendation: Start with Scale AI, Surge AI, and Toloka for an initial comparison, adding Appen or Turing if you need specialist expertise. Run a small pilot with the same preference-ranking rubric before committing to large-scale data collection.
Google AI ModeOct 14, 2026
Several prominent companies specialize in managing crowdsourced workforces and specialized human-in-the-loop teams specifically for Reinforcement Learning from Human Feedback (RLHF) and preference ranking tasks.[](https://www.troveo.ai/resources/rlhf-data-providers)[[2](https://www.nextwealth.com/blog/top-10-rlhf-data-annotation-services-for-llm-training-in-2026)](https://www.nextwealth.com/blog/top-10-rlhf-data-annotation-services-for-llm-training-in-2026/)
If you want to narrow down the right partner, tell me:
| OpenTrain AI |
| Recruiting study participants while retaining control | Prolific |
To help narrow down the best partner for your project, let me know:
