Top 5 AI Training Data Providers of 2025: Features, Pricing & More

In this guide, you will find:

An explanation of what an AI training data provider is

Key factors to consider when choosing a provider

The top 5 AI training data providers of 2025

A comparison table of these platforms

Let’s dive in!

What is Training Data and Who Provides It?

Training AI requires massive datasets. You can purchase your training data from any number of data providers. Ideally, you want to train a model on almost everything you can get your hands on. However, there are a few exceptions to this rule.

You need clean, high quality data. You can feed your LLM bad data by the truckload, but this won’t make your AI better. In fact, it will result in a large model with loads of unneeded classes and rules. A smaller set of good data results in a smaller, faster model with less training time. These results can be achieved with techniques like Few-Shot and GSZL (Generalized Zero-Shot Learning), which allow us to train a model on smaller sets of data.

You can acquire your data through a variety of methods. You can scrape it yourself , or even spoonfeed it PDF after PDF. The best way, however, is to attain high quality, curated data from a reputable provider.

Key Considerations When Choosing A Provider

When choosing a provider, there are a number of things that you need to account for. After all, better data leads to better models. If you’re training a model for stock and crypto analysis, your users really won’t care if it knows that a cow says “moo.”

Features : What features does the provider offer? Is it compatible with your existing (or hypothetical) system?

Available Data : What types of data can you get? For trading analysis, you need news, earnings, and market sentiment insights–not just price history.

Formats : In the real world, data comes in all sorts of formats: JSON, CSV, WAV, PNG, MP4–the list goes on and on!

Delivery Options : Whether you’re using integrated cloud storage or you manually feed your data to the model, your delivery method needs to fit your existing workflow.

Pricing : Many data companies charge an arm and a leg plus gratuity (well, not really, but you get the idea). You don’t want cost to prohibit the model training itself.

User Rating : What have other customers said about the product? In this day and age, reviews are everything. Your provider should have a solid track record–with this data, you don’t want anything left to chance.

Top Training Data Providers

1. demlon

demlon offers both real-time and historical data. This allows you to train your model on the best the internet has to offer. With solid historical data, your models can learn exactly what they need for effective generalization. If you plug them into real-time data sources, they can browse the web and save your users hours (if not days) of manually grinding to find the most important information.

Datasets come with free sample data–no surprises. If you do decide to commit to a paid plan, you gain access to a massive selection of formats and delivery options. demlon tailors their products to fit into your system–no need to alter your existing workflow.

Features Large Variety: If you can think of an industry, demlon likely has datasets and scrapers available. Pre-built Datasets: Analyze structured, uniform historical data to learn relationships and make proper generalizations. Real-time Scrapers: With real-time web scrapers, your LLM can stay up to date on all the latest news and trends. Sample Data: Sample data comes in JSON and CSV. You can try it before you buy it. Don’t be surprised later on! Custom Scrapers: Even when scrapers aren’t available, you can custom build them without any code. Real-time data is accessible to everyone–no learning barrier. Data Annotation: demlon now provides data annotation services where you can choose between automated, hybrid, and human-supervised workflows.

Available Data Business eCommerce Financial Geospatial Marketplace News Real Estate Social Media Travel

Formats JSON CSV Excel Custom

Delivery Options Snowflake Google Cloud PubSub AWS S3 Buckets Microsoft Azure REST API Direct Download

Pricing Datasets: $500/month Scraper APIs: $1.05/1,000 requests Custom Scraper: $300/month

G2 User Rating : 4.6

Large Variety: If you can think of an industry, demlon likely has datasets and scrapers available.

Pre-built Datasets: Analyze structured, uniform historical data to learn relationships and make proper generalizations.

Real-time Scrapers: With real-time web scrapers, your LLM can stay up to date on all the latest news and trends.

Sample Data: Sample data comes in JSON and CSV. You can try it before you buy it. Don’t be surprised later on!

Custom Scrapers: Even when scrapers aren’t available, you can custom build them without any code. Real-time data is accessible to everyone–no learning barrier.

Data Annotation: demlon now provides data annotation services where you can choose between automated, hybrid, and human-supervised workflows.

Business

eCommerce

Financial

Geospatial

Marketplace

News

Real Estate

Social Media

Travel

JSON

CSV

Excel

Custom

Snowflake

Google Cloud

PubSub

AWS S3 Buckets

Microsoft Azure

REST API

Direct Download

Datasets: $500/month

Scraper APIs: $1.05/1,000 requests

Custom Scraper: $300/month

2. Appen

Appen prides itself on “meticulously curated, high fidelity datasets.” It’s a solid choice for all types of machine learning. However, they don’t offer real-time data or upfront pricing–you need to contact them for a quote, no matter what data you’re looking for. They’re not limited to data, they’ll actually help train and fine-tune your model.

This 100% custom model leads to a very high quality product, but there are a couple of downsides. Even for pre-made datasets, you need to contact them for a quote. To get started with their products, you need to go through a human process. This slows things down and it’s likely very expensive. Their data spans across a variety of industries but interestingly enough, they mention nothing about actual data structure or delivery.

Features Text Data Image Data Video Data Data Labeling Fine Tuning Model Distillation RAG (Retrieval Augmented Generation)

Available Data Speech and Audio Recognition Computer Vision Text and NLP (Natural Language Processing) Healthcare Biomedical

Formats Audio Video Images Text

Delivery Options Not Mentioned

Pricing Custom (all orders require a custom quote)

G2 User Rating : 4.2

Text Data

Image Data

Video Data

Data Labeling

Fine Tuning

Model Distillation

RAG (Retrieval Augmented Generation)

Speech and Audio Recognition

Computer Vision

Text and NLP (Natural Language Processing)

Healthcare

Biomedical

Audio

Video

Images

Text

Not Mentioned

Custom (all orders require a custom quote)

3. Defined.ai

Defined.ai offers a variety of services similar to Appen. They offer a variety of pre-made sets used for all types of machine learning. Their focus is on high quality optimized training data. They’re confident enough in their data that they offer free samples–try it before you buy it.

Like Appen, Defined.ai offers no upfront pricing–you need to manually inquire for a quote. Since you’re waiting on humans, this process is slow and likely expensive. That said, not only do they machine optimized data, they offer a variety of services like annotation, fine-tuning and human evaluation.

Features Free Samples Text Data Image Data Video Data

Available Data Speech and Audio Recognition Computer Vision Text and NLP (Natural Language Processing) Medical Music Science

Formats PDF EPUB XLS WAV MP4 MOV

Delivery Options Not Mentioned

Pricing Custom (all orders require a custom quote)

G2 User Rating : 4.5

Free Samples

Text Data

Image Data

Video Data

Speech and Audio Recognition

Computer Vision

Text and NLP (Natural Language Processing)

Medical

Music

Science

PDF

EPUB

XLS

WAV

MP4

MOV

Not Mentioned

Custom (all orders require a custom quote)

4. Nexdata

Nexdata also offers a very similar selection to Appen and Defined.ai. They pride themselves on curated data for NLP, Speech Recognition and Computer Vision. These datasets seem great for a highly specialized AI. They also offer free samples upon request.

To get started with Nexdata, you also need to contact them. This human approval process seems to be a real trend. Similar to their other direct competitors above, they also run a business model with zero upfront pricing. However, they do offer a variety of file formats not listed by Appen and Defined.ai.

Features Free Samples Text Data Image Data Video Data

Available Data Natural Language Processing Computer Vision Facial Recognition Speech Recognition

Formats JSONL JSON JPG PNG WAV TXT

Delivery Options Not Mentioned

Pricing Custom (contact them for a quote)

G2 User Rating : Not Available

Free Samples

Text Data

Image Data

Video Data

Natural Language Processing

Computer Vision

Facial Recognition

Speech Recognition

JSONL

JSON

JPG

PNG

WAV

TXT

Not Mentioned

Custom (contact them for a quote)

5. DataoceanAI

Like other AI training data providers from our list, DataoceanAI offers no upfront pricing and requires a human approval process to access their data. However, they do have a rather unique offering: multimodal data.

Multimodal data combines text, audio, images and video. With multimodal data, your model can learn from multiple datatypes at once. This has real potential to decrease your training time. However, their lack of reviews undisclosed formats and undisclosed delivery methods put them in dead last on our list.

Features Natural Language Processing Speech Recognition Computer Vision Multimodal Data

Available Data Natural Language Processing Speech Recognition Text to Speech Machine Translation Computer Vision Multimodal

Formats Text Sound Video

Delivery Options Not Mentioned

Pricing Custom (contact them for a quote)

G2 User Rating : Not Yet Rated

Natural Language Processing

Speech Recognition

Computer Vision

Multimodal Data

Natural Language Processing

Speech Recognition

Text to Speech

Machine Translation

Computer Vision

Multimodal

Text

Sound

Video

Not Mentioned

Custom (contact them for a quote)

Summary Comparison

Conclusion

For large-scale AI training, demlon offers instant access to high-quality datasets without delays or approval processes.

Need real-time data? Use the Scraper API or the No-Code Scraper to extract fresh web data effortlessly. Sign up for a free trial today and power your AI with the best data available.