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Defined.ai
Defined.ai is the leading marketplace for ethical AI training data, helping AI teams build, scale, and deploy high-quality models with confidence. The platform offers ready-to-use datasets across speech, text, image, video, and multimodal, plus custom data collection, annotation, machine translation, conversational AI, LLM fine-tuning, and data and model evaluation services. Data is sourced from a global community of 1.6M+ vetted experts across 150+ markets and 500+ languages, dialects, and loca
For agents: Marketplace for ethical AI training data: 700+ licensable datasets across speech, text, image, video, plus annotation, collection, translation and LLM evaluatio
ai training dataspeech datasetsdata annotationmachine translation datallm fine-tuningdata collection
- Authority
- 50 reach 9 · trust 5 · quality 21 · freshness 15
- Tier
- listed
- llms.txt
- https://defined.ai/llms.txt
- Sections
- 10
- Links
- 24
- Size
- 5769 bytes
- Popularity rank
- #446236
- Categories
- AI and machine learning · Data and analytics
- For agents
- Transactional: buying or booking an agent could carry out
- Inferred actions
- Search content Buy products Download data Read documentation Support / contact About these labels
- Audience
- business · agents can: search content, buy, download data, read docs, contact support · en
- First seen
- 2026-10-19T10:41:02.084Z
- Last checked
- 2026-10-19T19:57:09.013Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-21T11:07:45.027Z. Cached copy · Source on defined.ai
# Defined.ai
> Defined.ai is the leading marketplace for ethical AI training data, helping AI teams build, scale, and deploy high-quality models with confidence. The platform offers ready-to-use datasets across speech, text, image, video, and multimodal, plus custom data collection, annotation, machine translation, conversational AI, LLM fine-tuning, and data and model evaluation services. Data is sourced from a global community of 1.6M+ vetted experts across 150+ markets and 500+ languages, dialects, and locales, with full provenance and compliance: ISO 27001, ISO 27701, ISO 42001, GDPR, and HIPAA.
Founded in 2015 by Daniela Braga, Defined.ai is headquartered in Seattle, with offices in Lisbon, Porto, and Tokyo. Customers include Fortune 500 enterprises, foundation model providers, and AI-first companies in technology, healthcare, finance, automotive, and other regulated industries.
This file follows the proposed `llms.txt` convention (https://llmstxt.org/) for helping AI assistants and LLM-powered search tools discover and cite our content accurately. It is complementary to `sitemap.xml` (for traditional search engines) and `robots.txt`.
## Marketplace
- [Data Marketplace](https://defined.ai/datasets): Browse and license 700+ ready-to-use AI training datasets across speech, text, image, video, and multimodal. Filter by language, domain, and format. Free samples available.
## Solutions
- [Data Annotation](https://defined.ai/solutions/data-annotation): Expert human annotation, labeling, transcription, and validation at scale — image, video, text, and audio.
- [Data Collection](https://defined.ai/solutions/data-collection): Custom data collection scoped to specific accuracy, demographic, language, and compliance requirements.
- [Machine Translation](https://defined.ai/solutions/machine-translation): Parallel corpora and translation training data across 500+ languages, dialects, and locales.
- [Conversational AI](https://defined.ai/solutions/conversational-ai): Speech and dialogue data for voice assistants, chatbots, IVR, and conversational agents.
- [Data & Model Evaluation](https://defined.ai/solutions/data-and-model-evaluation): Human-in-the-loop evaluation, red teaming, and quality assessment of AI datasets and models.
- [LLM Fine-Tuning](https://defined.ai/llm-fine-tuning): End-to-end LLM fine-tuning services — supervised fine-tuning (SFT), RAG, RLHF, DPO, red teaming, and model evaluation.
- [Crowd-as-a-Service](https://defined.ai/crowd-as-a-service): Direct access to 1.6M+ vetted, globally diverse contributors for custom data projects.
## Products
- [Accelerat.ai](https://defined.ai/accelerat-ai): Conversational AI product that automates up to 80% of customer support interactions in Portuguese. Built for enterprises expanding in Lusophone markets (Brazil, Portugal, Angola, Mozambique).
## Why Defined.ai (key differentiators)
- **Ethical sourcing**: All data is sourced with informed consent and fair compensation.
- **Scale and dive
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