Prolific records 18,697,671 monthly visits with -1.8% month-over-month growth and Paid pricing. String Catalog records 468 monthly visits with -66.7% growth and Paid pricing.
High-quality human data for AI training, evaluation, and research
Git-native app localization for iOS and Android teams
| Dimension / Metric | ||
|---|---|---|
| Official Domain | prolific.com | stringcatalog.com |
| Pricing Model | Paid | Paid |
| Monthly Visits | 18.7M (18,697,671) | 468 (468) |
| MoM Traffic Delta | -352.04K (-1.8%) | -937 (-66.7%) |
| Primary Market & Share | 🇺🇸 United States (48.8%) | 🌐 Global (—) |
| Direct Visits / mo | 12.98M | 185 |
| User Rating | 4.6 | 4.3 |
| 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.
Git-native app localization for iOS and Android teams
Connect GitHub, GitLab, or Bitbucket and receive localization updates as pull requests and clean diffs on the branch you release from, so your repository stays the single source of truth.
Round-trip .xcstrings for Apple platforms and Android strings.xml without spreadsheet export, broken builds, or custom scripts.
Translate App Store and Google Play release notes and store listing copy in the same product, with platform-specific field limits and locale handling.
Protect brand terms, add tone guidance, and reuse glossaries so each new locale keeps the product voice users already know.
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.
Free / Open-sourceAI-powered localization and translation platform for global content
Free / Open-sourceAI-powered localization and translation platform for global content
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-sourceSoftware localization on autopilot with AI drafts and human review
Free / Open-sourceSoftware localization on autopilot with AI drafts and human review
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.
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.
SpecialistRuns automated user interviews and usability tests with real or synthetic personas, but lacks a massive human participant pool.
SpecialistRuns automated user interviews and usability tests with real or synthetic personas, but lacks a massive human participant pool.
