
The AI coding agent for building ambitious software
The AI coding agent for building ambitious software
Contral records 2,636 monthly visits with -20.8% month-over-month growth and Freemium pricing. Prolific records 18,697,671 monthly visits with -1.8% growth and Paid pricing.

The teaching layer that explains every line your AI coding agent writes
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | contral.ai | prolific.com |
| Pricing Model | Freemium | Paid |
| Monthly Visits | 2.64K (2,636) | 18.7M (18,697,671) |
| MoM Traffic Delta | -694 (-20.8%) | -352.04K (-1.8%) |
| Primary Market & Share | 🇮🇳 India (78.3%) | 🇺🇸 United States (48.8%) |
| Direct Visits / mo | 1.02K | 12.98M |
| User Rating | 4.2 | 4.6 |
| Supported Platforms | Website | Website |

The teaching layer that explains every line your AI coding agent writes
Every line your agent writes is explained as it happens, covering what the code does, why it was written that way and the intended goal, in the same window.
A VS Code extension brings the teaching layer to Cursor, Copilot, Claude Code, Codex CLI, Cline, Kilo Code, Windsurf, Antigravity and more without changing your agent.
Plan, Fast, Deep and Recursive modes let you propose before writing, iterate quickly, reason deeply, or let the recursive agent plan multi-step work.
49+ prerequisite-locked topics, projects, graded checkpoints and boss exams inside the IDE, with a hint economy earned by completing topics.
High-quality human data for AI training, evaluation, and research
Filter participants by detailed demographic, professional, and behavioural criteria and reach narrow or representative samples rather than a generic crowd.
Collect human preference data for model fine-tuning, run safety evaluations and red-teaming, and use a feedback API to plug humans into automated pipelines.
Attention checks, honesty screening, and approval workflows help filter out careless or fraudulent responses before you analyse results.
Publish a study and begin collecting responses quickly, with tooling that supports screening, quotas, and longitudinal designs.

The AI coding agent for building ambitious software
The AI coding agent for building ambitious software
Learn to code free with hands-on lessons and instant playgrounds

Free / Open-sourceWrite code with precision, hand bigger jobs to agents, and keep working from anywhere
Free / Open-sourceWrite code with precision, hand bigger jobs to agents, and keep working from anywhere
An agentic coding platform that ships real software

Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.
Large consumer panel for market research surveys, but lacks Prolific's specialized focus on academic studies and AI tuning.

The coding agent that learns your coding taste
The coding agent that learns your coding taste
Free / Open-sourceA minimal, extensible terminal coding agent you can reshape
Free / Open-sourceA minimal, extensible terminal coding agent you can reshape

Free / Open-sourceOpen-source control plane for orchestrating coding agents

SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
SpecialistThe environments frontier AI trains on, and the agents that do the recurring work
SpecialistAn AI IDE and coding agent that works on your project, not just your cursor
SpecialistAn AI IDE and coding agent that works on your project, not just your cursor

Enterprise-grade data annotation and AI alignment workforce, but less self-serve for academic study recruitment and casual surveys.
Baidu's ERNIE-powered AI coding partner for your IDE