HumanSignal (formerly Heartex) is the company behind Label Studio, the widely used open-source data-labeling tool supporting images, video, audio, text, and documents in one interface. The Community edition is free to self-host; a hosted Starter Cloud plan is priced monthly, and Label Studio Enterprise adds quality workflows, RBAC, and SSO on a custom quote. Model-assisted pre-labeling connects through ML backends. In late 2025 it added managed multimodal data services via the Erud AI acquisition.
open-sourceannotation-platformmultimodal
Overview
- Founded
- 2019
- Pricing tier
- Low
- Startup-friendly
- Yes
- Enterprise-ready
- Yes
Data labeling
- Managed workforce
- No
- Model-assisted labeling
- Yes
- Video annotation
- Yes
- Text annotation
- Yes
- Open-source
- Yes
- Self-hostable
- Yes
- Free tier
- Yes: Open-source Community edition self-hosts free