Scales efficient language processing with open-source accessibility.
357M visits/mo+1%#2 Coding & Development
Appen
Access, annotate, and classify data for AI model training with a flexible and cost-effective service to maximize data value.
665KMonthly visits
47Popularity
About Appen
Appen is a global leader in providing high-quality, human-annotated data for machine learning and artificial intelligence. We provide a wide range of services that enable businesses to accurately train and deploy AI models. Our services are designed to help organizations make the most of their data and gain actionable insights, while ensuring data privacy and accuracy. With Appen, you can quickly and easily access the data you need to build and improve your AI models. We provide data annotation, natural language processing, audio and video transcription, and text classification services that are tailored to meet your specific needs. Our team of experienced professionals will work with you to ensure that your data is efficiently and accurately annotated and classified. Our services are designed to be flexible and cost-effective, allowing you to maximize the value of your data. With Appen, you can trust that your data is secure and your AI models are accurately trained and deployed.
Key features
- Quickly and easily access data for AI model training
- Efficiently annotate and classify data for accuracy
- Flexible and cost-effective services to maximize the value of your data
- Data annotation, natural language processing, audio and video transcription, and text classification services
- Human-annotated data for machine learning and artificial intelligence
Use cases
- Training AI models for various applications such as image recognition, speech recognition, and natural language processing
- Improving the accuracy of AI models by providing high-quality, human-annotated data
- Maximizing the value of data by using Appen's flexible and cost-effective services
Pros
- 30+ years of AI data expertise with proven track record across major AI milestones
- Specialized in human-annotated data for frontier AI models, including RLHF, SFT, and red teaming
- Covers over 500 global locales and supports multimodal, speech, audio, and physical AI data needs
- Provides model integrity services such as hallucination benchmarking, bias detection, and compliance audits
- Certified with SOC 2 and ISO 27001, ensuring data privacy and security standards
Cons
- May involve higher costs compared to fully automated solutions due to reliance on human expertise
- Scaling human annotation for large datasets can be time-consuming
- Complexity in managing diverse data types and specialized annotation requirements
Frequently asked questions about Appen
What is Appen and what does it do?
Appen provides high-quality human-annotated data to train and improve AI models, including services like data annotation, natural language processing, audio and video transcription, and text classification. It supports a wide range of AI applications, from speech and audio processing to multimodal and physical AI systems.
Who should use Appen?
Appen is designed for businesses and organizations developing AI models that require accurate, human-validated data, such as AI labs, tech companies, and enterprises working on advanced AI applications like large language models, autonomous agents, and multimodal systems.
What types of data services does Appen offer?
Appen offers specialized data services including frontier alignment, agentic AI, speech and audio processing, multimodal AI, physical AI, and model integrity audits. These services cover tasks like CoT reasoning, RLHF, TTS, VLM training, LiDAR annotation, and hallucination benchmarking.
Does Appen provide data for specific AI use cases?
Yes, Appen supports use cases such as training large language models, improving search relevance, enhancing machine translation, developing computer vision models, and ensuring AI safety and compliance through human evaluation and audits.
How does Appen ensure data quality and security?
Appen employs experienced professionals and follows strict data security protocols, including SOC 2 and ISO 27001 certifications, to ensure data privacy, accuracy, and compliance with regulatory standards.
How can I get started with Appen?
To get started, you can contact Appen through their website to speak with an expert, explore their data products, or discuss your specific AI training data needs. They offer tailored solutions and support to help you build and improve your AI models.
Appen traffic & engagement
appen.com · third-party estimates from Similarweb
Data as of Sep 2026Full AI website ranking →
Monthly visits · Sep 2026665K-10.8% MoM12-month high 931K (Jun 2026)
Rank among AI websites#648▼ 44 vs last monthof 8,652 tools on aitoolnavio™
Top marketUnited States24.5%Top 5 countries bring 49% of visits
Average visit1m 29sLonger than 70% of AI sites
Pages per visit2.9More than 76% of AI sites
Bounce rate44%Leave after one page · lower is better
Similarweb global rank#75,605#44,428 in United States
Traffic trend
Last 4 months · grows by one month every month
- Jun 2026931K
- Jul 2026921K−1.1%
- Aug 2026745K−19.1%
- Sep 2026665K−10.8%
Top countries
Share of visits · estimated visits
Other countries: 50.9%
Visits sent by AI assistants
How people reach this site from other AI tools
6.8K a month · 1% of all visits
Compared with similar tools
Coding & Development · Sep 2026
Traffic figures are third-party estimates, good for scale and trends; they can differ from a company's own numbers. Updated monthly.
