Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. Text2Cron records 70 monthly visits with -96.7% growth and Paid pricing.
High-quality human data for AI training, evaluation, and research
Turn plain-English schedules into ready-to-paste cron expressions
| Dimension / Metric | | |
|---|---|---|
| Official Domain | prolific.com | text2cron.com |
| Pricing Model | Paid | Paid |
| Monthly Visits | 18.7M (18,697,671) | 70 (70) |
| MoM Traffic Delta | -352.04K (-1.8%) | -2.04K (-96.7%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🇵🇪 Peru (60.4%) |
| Direct Visits / mo | 12.98M | 26 |
| User Rating | 4.6 | 4.2 |
| Supported Platforms | Website | Website |
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.
Turn plain-English schedules into ready-to-paste cron expressions
Type a schedule in plain English — 'every weekday at 2 PM', 'every 30 minutes', '15th of each month at 3 PM' — and receive a standard five-field cron expression to copy.
The site states all conversion happens in your browser with no scheduling data stored or transmitted to external servers, keeping infrastructure details private.
Output targets standard Unix cron format, working across Linux crontab, Vixie cron, macOS cron, AWS EventBridge, Kubernetes CronJobs and CI/CD pipeline definitions.
Documents each cron field, explains special characters like *, /, L, W and #, and shows conversions for time-based, day-based and monthly schedules.
Free / Open-sourceBuild working apps, websites, and AI agents by describing them
Free / Open-sourceBuild working apps, websites, and AI agents by describing them
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.
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
Enterprise-grade data annotation and AI alignment workforce, but less self-serve for academic study recruitment and casual surveys.
SpecialistAI data infrastructure for building production-grade models
SpecialistAI data infrastructure for building production-grade models
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
SpecialistSpecializes in video-based consumer interviews and AI qualitative analysis, but less focused on quantitative academic survey panels.
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
SpecialistSources verified B2B professionals and healthcare experts for specialized research, but lacks broad general-population academic panels.
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
Free / Open-sourceOpen-source data labeling and evaluation platform for AI workflows, but requires bringing your own annotation workforce.
Free / Open-sourceAI SQL assistant that writes, fixes and runs queries on your real schema
Free / Open-sourceAI SQL assistant that writes, fixes and runs queries on your real schema
SpecialistAI-led customer interviews and research insights at scale
SpecialistAI-led customer interviews and research insights at scale
SpecialistConnects AI labs with domain experts for data collection, but lacks a self-service marketplace for bulk academic study participants.
SpecialistConnects AI labs with domain experts for data collection, but lacks a self-service marketplace for bulk academic study participants.
Free / Open-sourceFree AI converter that turns plain JavaScript into fully typed TypeScript
Free / Open-sourceFree AI converter that turns plain JavaScript into fully typed TypeScript
