# HumanSignal

> HumanSignal, the San Francisco company behind the open-source labeling tool Label Studio, helps AI teams turn messy raw data into the labeled, evaluated, human-judged datasets that models actually learn from. Formerly called Heartex, it pairs a tool used by more than a million practitioners with an enterprise platform and expert data services for the RLHF and LLM-evaluation era.

- **Founded:** 2019
- **Headquarters:** San Francisco, California, United States
- **Founders:** Michael Malyuk (CEO & Co-Founder), Nikolai Liubimov (CTO & Co-Founder), Max Tkachenko (Co-Founder)
- **Team size:** ~130 employees
- **Products:** Label Studio, Label Studio Enterprise, HumanSignal Data Services, Prompts / AI evaluation
- **Notable:** Built Label Studio into the most widely adopted open-source data labeling tool, with 28k+ GitHub stars and 1M+ users., Raised $30M total, including a $25M Series A led by Redpoint Ventures in 2022., Achieved SOC2 and HIPAA attestations for enterprise and regulated-industry customers.

## Products & services

- **Label Studio** — The open-source, multi-type data labeling and annotation tool. Supports text, images, audio, video, time series and more with a standardized output format. Used by 1M+ practitioners; 28k+ GitHub stars.
- **Label Studio Enterprise** — Managed platform adding AI-assisted labeling, quality review and reviewer workflows, RBAC, SSO, audit logging, SLAs, and SOC2/HIPAA compliance. Available on AWS Marketplace.
- **HumanSignal Data Services** — Expert annotation, data collection, red teaming, preference collection and fine-tuning support with native speakers across 91 countries.
- **Prompts / AI evaluation** — Tooling for LLM evaluation, RLHF preference collection, benchmarking, and model-assisted labeling with customizable rubrics.

## Achievements

- Built Label Studio into the most widely adopted open-source data labeling tool, with 28k+ GitHub stars and 1M+ users.
- Raised $30M total, including a $25M Series A led by Redpoint Ventures in 2022.
- Achieved SOC2 and HIPAA attestations for enterprise and regulated-industry customers.
- Rebranded from Heartex to HumanSignal in 2023 to reposition around the generative-AI and human-feedback era.
- Reached community adoption across 91 countries.

## Latest updates

- **2024-01** — Expanded into LLM evaluation, RLHF preference collection and agent-trace labeling as generative AI reshaped demand.
- **2023-06** — Rebranded from Heartex to HumanSignal, repositioning around human feedback for foundation models.
- **2022-05** — Closed a $25M Series A led by Redpoint Ventures.

## Links

- Website: https://humansignal.com
- LinkedIn: https://www.linkedin.com/company/humansignal
- Twitter/X: https://twitter.com/humansignal_
- GitHub: https://github.com/HumanSignal
- YouTube: https://www.youtube.com/@labelstudio

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Profile page: https://yespress.io/humansignal
Published by YesPress — https://yespress.io
Last updated: 2026-08-21