
Matches vetted domain experts with remote AI training and engineering roles using AI-driven vetting.
Matches vetted domain experts with remote AI training and engineering roles using AI-driven vetting.
CodeFast records 13,640 monthly visits with -63.8% month-over-month growth and Paid pricing. Outlier AI records 10,372,036 monthly visits with +7.6% growth and Paid pricing.

Learn just enough code to launch a real online business in 14 days
| Dimension / Metric | ![]() | ![]() |
|---|---|---|
| Official Domain | codefa.st | outlier.ai |
| Pricing Model | Paid | Paid |
| Monthly Visits | 13.64K (13,640) | 10.37M (10,372,036) |
| MoM Traffic Delta | -24.04K (-63.8%) | +736.51K (+7.6%) |
| Primary Market & Share | 🇮🇳 India (39.9%) | 🇺🇸 United States (21.6%) |
| Direct Visits / mo | 5.88K | 5.82M |
| User Rating | 4.4 | 3.8 |
| Supported Platforms | Website | Website |

Learn just enough code to launch a real online business in 14 days
Fundamentals, a full SaaS build, and the business side — payments, domains, hosting, SEO — are covered in about twelve hours of video instead of the dozens of hours a conventional JavaScript course spends on topics you will never use.
Rather than theory for interviews, you progressively build a real authenticated, paying SaaS, which is the actual deliverable of the course.
Sections on AI-powered coding and design show how to use AI to explain code, fix bugs and generate parts of your app, framed as leverage on top of fundamentals.
The syllabus includes the non-coding skills that decide whether an app makes money: copywriting essentials, payments with Stripe and LemonSqueezy, domain and DNS setup, hosting and SEO.

Get paid to train the next generation of AI models
After skill screening, contributors are matched to projects that fit their domain, from coding and math to linguistics and medicine.
No minimum hours and fully remote work, so experts can fit tasks around study, research or a primary job.
Typical work includes writing hard prompts, producing grading rubrics, ranking competing answers and reviewing model reasoning.
Contributors are paid for approved work each week, with rewards that scale with the quality of their output.

Matches vetted domain experts with remote AI training and engineering roles using AI-driven vetting.
Matches vetted domain experts with remote AI training and engineering roles using AI-driven vetting.
Free / Open-sourceAI engineering courses, certificates, and the world's biggest AI newsletter
Free / Open-sourceAI engineering courses, certificates, and the world's biggest AI newsletter

Offers crowdsourced data collection and annotation services, operating on a broader task-based crowdsourcing model.
Offers crowdsourced data collection and annotation services, operating on a broader task-based crowdsourcing model.

Connects AI research labs with human subject matter experts for specialized evaluation and data annotation tasks.
Connects AI research labs with human subject matter experts for specialized evaluation and data annotation tasks.

Free / Open-sourceFree courses, live events and community for building real AI skills
Free / Open-sourceFree courses, live events and community for building real AI skills

Established enterprise data annotation provider offering large-scale human validation and alignment services for AI models.

SpecialistHosts AI hackathons and community building events rather than freelance data annotation work.
SpecialistHosts AI hackathons and community building events rather than freelance data annotation work.
Free / Open-sourceFree practical deep learning courses, research and open-source libraries

Provides enterprise-grade human data and RLHF evaluation, connecting expert annotators with leading AI labs.
Provides enterprise-grade human data and RLHF evaluation, connecting expert annotators with leading AI labs.
Free / Open-sourceLarge open community hub for data science and machine learning practitioners to collaborate and network.
Free / Open-sourceLarge open community hub for data science and machine learning practitioners to collaborate and network.

SpecialistProvides custom enterprise AI consulting and development services rather than crowd-sourced annotation tasks.
SpecialistProvides custom enterprise AI consulting and development services rather than crowd-sourced annotation tasks.

Free / Open-sourceCourses and best practices for building AI-powered products end to end
Free / Open-sourceCourses and best practices for building AI-powered products end to end