Human data for frontier AI

Faster iteration. Better real-world model performance with Appen.

Why Frontier AI Teams Choose Appen

30+
Years in AI training data
1M+
Vetted contributors worldwide
170+
Countries represented
235+
Languages supported
20K+
Projects completed
80%
Of leading LLM builders are customers

Expertise

With over 30 years of data and AI expertise, we deliver future-ready, trusted data and workflows to power up the world’s AI innovators and next-gen models.

Quality

We provide high-complexity, expert data tailored to your unique use cases and task requirements.

Scale

1M+ skilled, multilingual contributors worldwide enable us to prepare data at scale.

Innovation

As an industry-leading AI data solution provider, we continuously invest in research and technology to push the boundaries of what's possible for the future of AI.

Data products for modern AI development

Agentic AI

Building agents that must execute, not just respond

Expert-designed data infrastructure that makes agents reliable at scale - built on golden trajectory creation, failure mode analysis, enterprise RAG evaluation, and full RL environments covering agentic task, verifier and reward design across coding, DevOps, ITSM, finance, and HR.

Frontier Alignment

Made to improve real-world model performance

Domain-specific human intelligence that moves models from text generators to true reasoning agents - spanning multi-step CoT reasoning, bias detection, cultural mitigation, SME-led RLHF, LLM-as-a-Judge, LLM retrieval and search functionality, and more.

  • Deep domain expertise across 90+ domains.
  • 300+ LLM projects delivered in the last 12 months.

Multimodal AI

High-complexity multimodal data annotation and evaluation

Production-ready data annotation and evaluation built for multimodal language models and vision-language models - from text, image, audio, and video data labeling to SFT demonstrations, adversarial red teaming, rubric-based LLM output evaluation at scale.

  • 10B+ data units delivered across 15,000+ AI projects.
  • 90,000 evaluations completed in 4 days across 6 domains.

Data Collection

Custom, responsible data collection for frontier models

Custom datasets tailored to the exact conditions your model will operate in - through egocentric video, robotic sensor capture, in-cabin automotive, wearable devices, speech, image, and conversational audio across 10+ global markets, with moderated and unmoderated programs built in.

  • Million-scale data units delivered across 500+ languages and 100+ domains

Speech & Audio Data

Bespoke speech and audio data for every voice AI use case

Focusing on the natural interaction of frontier-training models to listen and speak like humans. From expressive TTS synthesis to real-time dialogue covering audio-to-text transcription, conversational AI training data, acoustic scene understanding, and dialectal speech across 500+ languages and locales.

  • Coverage across 500+ languages, dialects, and locales.

Physical AI

Egocentric video, robotics, and embodied AI training data

Spatially precise Physical AI data layer for embodied, autonomous, and physically grounded systems - from LiDAR annotation to large-scale egocentric video datasets for world model collection.

  • 50,000+ custom data units delivered for frontier Physical AI teams.

30 years at the intersection of human intelligence and AI

Voices from AI Leaders
Appen’s experience with data across the AI lifecycle will be a critical step forward for helping enterprises accelerate building, deploying and adoption of customizable AI, bringing AI to each and every industry.
Hemant Dhulla
Global Head of NVIDIA AI Software
In our mission to create world-class artificial intelligence chatbots at record speed, high-quality data sets are essential. Appen is a very important partner in this process because we can rely on them for exactly that: speedy and high-quality datasets that we use to train our AI engine and provide conversational experience. Their global coverage allows us to provide a premium service for our clients, all over the world, in any language.
Ante Stjepanovic
Product Marketing Manager at Infobip
Appen’s platform is really easy to use. What makes it great is you can reach so many different channels because of its global outreach.
Kenneth Benoit
Director of the Data Science Institute, London School of Economics
Appen is so fast. Using their platform, we could do overnight what used to take us a month. Appen is wonderfully efficient.
Rick Britt
Vice President of AI, CallMiner
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