Guides
Guides to human evaluation of AI models
Choose a platform, budget a study and collect human judgments of image, video, speech and LLM outputs.
Compare platforms
Where human evaluation can run, what each platform charges for and how much of the study you build yourself.
Prolific Alternatives for AI Model Evaluation (2026)
Prolific alternatives for human evaluation of image, video, speech and LLM outputs, compared by pricing model, cost per 1,000 responses, speed and how much of the study you build yourself.
The Best Human Preference Data APIs & Providers in 2026
Where to get human preference data for RLHF, DPO, reward models, and evals in 2026: API-first platforms, annotation services, research panels, and open datasets, honestly compared.
Rapidata Alternatives for Human Preference Data (2026)
A practical comparison of Rapidata alternatives for collecting human preference data: Datapoint, Prolific, Surge AI, Scale AI, and Toloka, by audience, speed, pricing model, and API depth.
Datapoint vs Rapidata
Datapoint vs Rapidata: Datapoint runs tasks through its own SDK, verifies every rater and checks every answer before it counts, across 1B+ people.
Datapoint vs Prolific
Prolific bills participant hours plus a 42.8% fee, about $214 per 1,000 video comparisons. Datapoint bills a flat rate per response, about a quarter of that, with first responses in minutes.
Amazon Mechanical Turk alternative
Amazon Mechanical Turk closed on September 30, 2026. Datapoint is an API for the same human judgments: comparisons, ratings, rankings and multiple choice from verified people in 200+ countries, with first responses in minutes.
All platform comparisons
Side-by-side pages for 35+ research, panel and data platforms.
Plan an evaluation
How many responses a study needs, what they cost and what to collect for each modality.
What Human Evaluation of Generative Models Costs (Video, TTS, Image)
How to budget a human evaluation for text-to-video, text-to-speech and image models: how many responses you need, and what they cost per 1,000 on hourly and per-response platforms.
Prolific Pricing Explained: What 1,000 Responses Cost (2026)
How Prolific pricing works for companies: the hourly participant reward, the 42.8% platform fee, and the cost per 1,000 responses for image, text, speech and video evaluation.
Text-to-image human preference data
Collect human preference data on text-to-image model outputs via API: pairwise comparisons, prompt-faithfulness ratings, and aesthetic judgments from real consumers. 2M+ votes already published on Hugging Face.
Text-to-video human preference data
Human preference data for video generation models: motion quality, temporal consistency, and realism judgments from real people via API. Behind the 145K-judgment VidPrefMotion dataset.
Text-to-speech human evaluation and preference data
Human evaluation for TTS models via API: pairwise naturalness preferences and MOS ratings from native listeners, at a flat rate per response. Behind the 315K-vote Audio Bench dataset.
Human evaluation API for LLM outputs
Run human evals on LLM responses via API: side-by-side preference votes, helpfulness ratings, and judge-calibration data from real users. The ground truth for LLM-as-a-judge pipelines.
Pairwise comparison data collection
Collect pairwise comparison data at scale via API: A/B judgments from verified real people on any media (text, image, audio, video) with agreement statistics, back in minutes.
Build with the API
From a first comparison job to live feedback while a model trains.
Quickstart: your first comparison job
Create an API key, upload media, create a comparison job and fetch the votes.
Task types
Comparison, rating, ranking, multiple choice and text answer, and when to use each.
Datapoint MCP server
Connect Claude Code, Claude Desktop, Cursor, Windsurf or VS Code and collect human feedback from inside an agent.
Online RL with Streams
Send rollouts to raters while a model trains and read rewards as each item finalizes.
Glossary
Plain definitions of the terms used in preference data and human evaluation.
Already have a study in mind?
Bring the modality, the number of items and the votes per item. We come back with the setup, the cost and the turnaround within a working day.