Appen
Appen is your trusted data partner, powering cutting-edge AI applications for the world's most innovative companies.
21253 employees · est. 1996 · Kirkland, United States
Appen is the older company (1996 vs 2019); Appen is the larger of the two.
Side-by-Side Comparison
| Metric | Appen | Snorkel AI |
|---|---|---|
| Founded | ||
| Founded | 1996 older | 2019 |
| Headquarters | ||
| Headquarters | Kirkland, United States | San Francisco, United States |
| Employees | ||
| Employees | 21253 larger | 1461 |
| Industry | ||
| Industry | AI, Data Analytics, Enterprise Software | AI, Data Analytics, Enterprise Software |
| Funding Stage | ||
| Funding Stage | Later Stage | Series D |
| Total Funding | ||
| Total Funding | $40.20M | $235.00M |
| Funding Rounds | ||
| Funding Rounds | 3 | 8 |
| Services | ||
| Services | Data Annotation, AI Model Evaluation, Speech and Audio Analysis, Multimodal Training Data, Compliance Audits and Bias Detection | Expert-curated Datasets, Data-as-a-Service, Custom AI Development, AI Benchmarking, Research Publications and Findings, Evaluation and Grading Tools |
| Target Customers | ||
| Target Customers | AI Research Labs, Technology Companies, Robotics Firms, Large Language Model Developers, Enterprise Clients needing AI Integration | Frontier AI Teams, Enterprise AI Teams, AI Researchers, Domain Experts, Organizations in Specialized Domains |
| Taxonomy | ||
| Taxonomy | AI Training Data, Human-in-the-loop Services, Generative AI, Large Language Models, Computer Vision, Speech Recognition, Supervised Fine-Tuning, Reinforcement Learning With Human Feedback, Bias Mitigation, Data Annotation Platform, Language Resource Management, Multi-Language Database Development, Natural Language Processing, Social Media Moderation, Machine Translation | AI Data Development, Programmatic Data Labeling, Data Curation, Weak Supervision, High-Quality AI Models, AI Benchmarks, AI Evaluation, Reinforcement Learning, Reinforcement Learning From Human Feedback (RLHF), Supervised Fine-Tuning (SFT), Custom AI Solutions, AI-Ready Datasets, Enterprise AI Applications, Frontier AI, Agentic AI |
| Website | ||
| Website | appen.com | snorkel.ai |
About Appen
Appen, founded in 1996 in the United States, stands as a leader in the AI training data industry, providing essential datasets for top-tier companies innovating in AI applications. The company excels in end-to-end solutions for creating bespoke, human-generated data pivotal for training and optimiz...
About Snorkel AI
Snorkel AI, founded in 2019 out of the Stanford AI Lab, positions itself as The Frontier AI Data Lab, offering cutting-edge solutions in AI data and environment development. This firm operates at the intersection of AI, Data Analytics, Enterprise Software, and Machine Learning, empowering teams to t...
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Funding, hiring, leadership and stack changes at Appen and Snorkel AI — by email.
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Compiled from the BounceWatch company index. We last looked at Appen on 13 Sep 2026, and Snorkel AI on 13 Sep 2026. Where a field is blank here, it means we have not recorded it — not that the answer is zero. How we source and date this.
