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Defined.ai

The world's largest ethically-sourced AI data marketplace – trusted by Adobe, Amazon, Google, Meta, and OpenAI, custom data collection across 150+ countries and 500+ languages.

3.6 Good 3.6
Real, verifiable major-company client roster Pricing isn't public – requires a custom quote
Reviewed by Challenging Voice Editorial · Updated Sep 2026 How we rate
PricingContact for Pricing
Free planNo
CompanyDefined.ai
PlatformsAPI, Web
CategoryAI Infrastructure & Agent Tooling
Last reviewedAug 2026
UpdatedSep 2026

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Overview

Defined.ai is an AI training data platform providing high-quality datasets and services for enterprise AI development, letting organizations access, customize, and commission training data across multiple modalities rather than scraping it themselves.

The Data Marketplace offers ready-to-use datasets across audio, image, video, text, and multimodal formats via API for rapid deployment, positioned as the world’s largest AI Data Marketplace with ethically sourced content. AI Services add data annotation with model-in-the-loop verification, custom data collection spanning 150+ countries and 500+ languages, data and model evaluation, machine translation, and conversational AI support – all backed by ISO 27001, 27701, and 42001 certifications plus GDPR and HIPAA compliance under an “ethical AI by design” approach.

Defined.ai targets enterprise AI teams in technology, healthcare, finance, automotive, and gaming needing mission-critical, regulated, multilingual, and domain-specific training data, with trusted users including Adobe, Amazon, Google, Meta, and OpenAI. Pricing isn’t listed publicly; quotes and custom pricing are available upon request.

Key features

  • Datasets across audio, image, video, text, and multimodal formats
  • Custom data collection across 150+ countries and 500+ languages
  • Model-in-the-loop data annotation and evaluation
  • ISO 27001/27701/42001, GDPR, and HIPAA compliance
  • Named trusted clients – Adobe, Amazon, Google, Meta, OpenAI

Screenshots & demo

Defined.ai screenshot 1

Pricing

Defined.ai uses custom pricing. Contact their team for a quote based on your needs.

  • Pricing modelContact for Pricing
  • Starting priceCustom
  • Free planNo
Visit Defined.ai

Pricing is provided as a guide. Check the official site for the latest plans.

Pros & cons

Pros

  • Real, verifiable major-company client roster
  • Ethical, privacy-first sourcing stance rather than unlicensed scraping
  • Comprehensive compliance credentials for regulated industries

Cons

  • Pricing isn't public – requires a custom quote
  • Built for enterprise AI teams, not individual developers
  • Data quality evaluation still requires domain expertise to apply correctly

How it compares

ToolRatingFreeFromBest known for
Defined.ai (this tool)3.6No—Datasets across audio, image, video, text, and multimodal formats
Dataloop3.8No—Foundation model / GenAI integration and model management
Surge AI4.3No—Data annotation and reinforcement learning from human feedback for AI training
syntheticAIdata3.6No—Synthetic image datasets for computer vision training

Alternatives to Defined.ai

4 tools matched to Defined.ai on what they do, their category and their price.

Frequently asked questions

What is Defined.ai?
Defined.ai is an AI training data platform providing high-quality datasets and services for enterprise AI development, letting organizations access, customize, and commission training data across multiple modalities rather than scraping it themselves.
Is Defined.ai free?
Defined.ai does not offer a free plan.
What are the best Defined.ai alternatives?
The closest matches in the directory are Dataloop, Surge AI, and syntheticAIdata, compared side by side above.

Reviews

3.6 Editorial rating No reviews yet

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