HumanSignal
HumanSignal provides AI data labeling, evaluation, and fine-tuning infrastructure through Label Studio Enterprise SaaS, the Label Studio open-source platform used by 1M+ practitioners, and HumanSignal Services for frontier AI labs. It serves enterprises across healthcare, financial services, technology, gaming, and aviation.
- Company typePrivate
- Founded2019
- HeadquartersSan Francisco, United States
- Headcount51–100
- GTM typeB2B
- OfferingSoftware
What HumanSignal does
HumanSignal, founded in 2019 as Heartex (rebranded June 2023) and headquartered in San Francisco, is an AI data infrastructure company building tooling and services to create, evaluate, and operationalize the human-judgment datasets that train, fine-tune, and benchmark modern AI systems. The company's core technology is Label Studio, the world's most widely adopted open-source data labeling platform, used by over 1,000,000 AI practitioners across 50+ countries. The platform supports the full range of data modalities relevant to contemporary AI development - text, images, audio, video, time-series, structured/sensor data, and 3D - through programmable interfaces, AI-assisted annotation, LLM-as-a-judge evaluators, autonomous labeling agents (Adala), and quality review workflows with SOC 2 Type II and HIPAA compliance for regulated deployments.
HumanSignal monetizes through a layered business model. Label Studio Enterprise is sold via direct field sales to large organizations with quote-based annual subscriptions, deployable in cloud or on-prem. Label Studio Starter Cloud is a self-serve offering at $99/month for the first user targeting small teams and individual practitioners, with a 14-day free trial. HumanSignal Services, launched in November 2025 concurrent with the acquisition of Erud AI, adds professional services for multimodal data creation, on-site data collection, robotics and embodied AI data, and expert annotation targeting frontier AI labs and enterprise model builders. AWS Marketplace listing (December 2025) provides an additional enterprise procurement channel through committed cloud spend. The company's $30M in total funding (Series A of $25M in May 2022 led by Redpoint Ventures) supports continued product expansion across LLM evaluation, agentic AI evaluation, and AI-native document standards (DocLang working group with IBM, NVIDIA, and Red Hat, June 2026).
HumanSignal serves a diversified enterprise base including Canva, Zendesk, Outreach, Epic Games, Verily, Lufthansa Technik, Yext, Scoutbee, Bayer, and Geberit, spanning technology, healthcare, financial services, gaming, aviation, and design. Documented outcomes include Scoutbee achieving 2-3x revenue increase through ML-based products, Yext achieving 525% capacity expansion and 2-4x more annotations per day, and Interfaces beta customers reporting 90% reduction in clicks and keystrokes. The company's positioning spans AI research labs (post-training data, safety/alignment, evaluation), tech and AI product teams (customizable annotation and evaluation workflows), financial services (EU AI Act compliance, audit trails), and healthcare and life sciences (HIPAA-compliant PHI workflows).
HumanSignal firmographics
Firmographics- Name
- HumanSignal
- Legal name
- HumanSignal, Inc.
- Website
- https://humansignal.com
- Company type
- Private
- Founded year
- 2019
- Operating status
- Operating
- Headcount range
- 51–100 employees
- Short description
- HumanSignal provides AI data labeling, evaluation, and fine-tuning infrastructure through Label Studio Enterprise SaaS, the Label Studio open-source platform used by 1M+ practitioners, and HumanSignal Services for frontier AI labs. It serves enterprises across healthcare, financial services, technology, gaming, and aviation.
- Ownership category
- akta.pro rank
HumanSignal industry classification
Industry- Product category
- AI Data Labeling and Evaluation Platform
- NAICS
- Software Publishers (5132), Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)
- SIC
- Services-Prepackaged Software (7372), Services-Computer Programming, Data Processing, Etc. (7370)
- akta.pro primary industry
- Annotation Tooling & Workflow Management (HDAAALAC)
- akta.pro secondary industries
- RLHF, Human Feedback & Evaluation Data Tools (HDAAALAJ), Data Labeling & Annotation Services (HDAAALAB), Responsible AI, Security & Privacy Platforms (Safety, Guardrails, PII) (HDAEANAG), Data Augmentation & Programmatic Labeling (HDAAALAH)
Keywords
Where HumanSignal is headquartered
LocationHeadquarters
- HQ city
- San Francisco
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
HumanSignal business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure
Revenue model
- Label Studio Enterprise SaaS Subscription: Subscription-based SaaS pricing for Label Studio Enterprise with annual or monthly billing. Includes automation, security, quality control, and quality review workflows. Enterprise customers can deploy in cloud or on-prem.
- Label Studio Starter Cloud: Self-serve cloud subscription at $99/month for first user, $49/month per additional user (up to 12 users). Includes team collaboration features, role-based access control, and automated task distribution.
- HumanSignal Services: Professional services for multimodal data creation including on-site data collection, expert annotation, evaluation, and red teaming. Partners with customers from concept to delivery for frontier AI labs and enterprise model builders.
- AWS Marketplace Listing: Label Studio Enterprise available through AWS Marketplace, allowing enterprises to purchase using existing AWS commitments and committed cloud spend.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Subscription | Monthly | Starter Cloud - $99/month first user, $49/month per additional user (up to 12 users) |
| Subscription | Annual | Label Studio Enterprise - Enterprise field sales, quote-based pricing |
Go-to-market motion3 records
Distribution channels4 records
Marketing channels8 records
HumanSignal product offering
Product offeringCore offering
HumanSignal provides the Label Studio multimodal AI data labeling and evaluation platform, available as an open-source community edition (1M+ users), a self-serve Starter Cloud ($99/month), and an enterprise SaaS with security and compliance (SOC 2 Type II, HIPAA). The platform enables teams to annotate text, images, audio, video, time-series, and 3D data and to evaluate, benchmark, and fine-tune AI models through human-in-the-loop workflows and LLM-as-a-judge evaluators.
Product overview
HumanSignal offers a comprehensive AI data platform combining software infrastructure and operational services. The core product portfolio includes Label Studio Enterprise (enterprise-grade labeling and evaluation platform), Label Studio Starter Cloud (self-serve cloud for small teams), and the open source Label Studio (community edition with 1M+ users). HumanSignal Services provides multimodal data creation and expert annotation for frontier AI labs, while Adala offers open source autonomous data labeling agents. The platform supports the entire AI development lifecycle from data preparation through evaluation and fine-tuning, with capabilities spanning AI Benchmarks, RAG Optimization, Fine-Tuning Models, Agentic Evaluation, and LLM Evaluation. Recent addition of Interfaces (2026) enables AI agent-powered interface generation for building custom labeling workflows.
Differentiator
Problem solved
Functional benefit
Products and services
- Label Studio Enterprise Enterprise-grade data labeling, evaluation, and quality workflow platform for teams building AI. Supports multimodal data annotation (text, image, audio, video, sensors, 3D) with programmable interfaces, AI-assisted annotation, reviewer workflows, SSO/LDAP, role-based access control, audit logs, and SOC 2 Type II and HIPAA compliance. Available as cloud or on-premise deployment.
- Label Studio Open Source Free, open-source multimodal data labeling platform with over 1,000,000 AI practitioners, 250,000+ registered users, and 100M+ pieces of data labeled. Supports NLP, computer vision, audio, time-series, and multi-domain annotation with a customizable programmable interface and Python SDK.
- Label Studio Starter Cloud Self-serve cloud-based collaborative data labeling platform for small teams and individual practitioners, priced at $99/month for the first user and $49/month per additional user (up to 12 users). Includes role-based access control, automated task distribution, AI model integration, and a 14-day free trial with no credit card required.
- HumanSignal Services Professional multimodal data creation and expert annotation services division. Provides on-site multimodal data collection, robotics and embodied AI data, next-generation device data collection, and expert annotation, evaluation, and red teaming services that partner with customers from concept to delivery for frontier AI labs and enterprise model builders.
- Adala Open-source autonomous data labeling agent framework that provides agents capable of learning and executing data labeling tasks with human oversight, released to the community under open source principles.
Quantifiable outcome
- 2-3x increase in revenue through ML-based products (Scoutbee case study)
- +5 more outcomes
Companies that use HumanSignal
Customer profileNamed customers15 records
Segments5 records
Ideal customer profiles5 records
HumanSignal technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration11 records
AI capability17 records
Feature5 records
HumanSignal partnerships and signals
Strategic signalPartnerships
Seven partnerships are on record, tiered core.
- IBMcoreIBM co-founded the DocLang Specification Working Group under the Linux Foundation's LF AI & Data Foundation, alongside NVIDIA, Red Hat, ABBYY, and HumanSignal. DocLang is an open, AI-native document format specification designed to make documents comprehensible and usable by AI systems, replacing custom parsing requirements.
- NVIDIAcoreNVIDIA co-founded the DocLang Specification Working Group under the Linux Foundation's LF AI & Data Foundation. DocLang is an open document format specification for AI-native document processing that addresses the challenge of making disparate document formats comprehensible by AI systems.
- Red HatcoreRed Hat co-founded the DocLang Specification Working Group under the Linux Foundation's LF AI & Data Foundation. The initiative aims to develop an open, AI-native document format that structures business documents for machine readability.
- ABBYYcoreABBYY is a contributor to the DocLang Specification Working Group alongside IBM, NVIDIA, Red Hat, and HumanSignal. ABBYY released FineReader Engine 12.8.0 with support for DocLang, demonstrating processing speeds of 2,160,000 pages per hour.
- Linux Foundation LF AI & Data FoundationcoreThe Linux Foundation's LF AI & Data Foundation hosts the DocLang Specification Working Group. HumanSignal contributes to this open standard for AI-native documents alongside IBM, NVIDIA, Red Hat, and ABBYY.
- Amazon Web Services (AWS)coreLabel Studio Enterprise is available on AWS Marketplace, enabling enterprises to purchase through existing AWS accounts and committed cloud spend. This provides a streamlined procurement path for organizations with AWS infrastructure and commitments.
- Erud AIcoreHumanSignal acquired Erud AI to develop a new data infrastructure for AI training and testing. Erud AI brings deep operational expertise scaling secure, on-site data facilities and workforces. The acquisition enables end-to-end data creation factory combining Label Studio's platform with Erud's operational services.
Scale indicators6 records
Recent moves8 records
Expansion highlights7 records
HumanSignal competitors and assessment
Company assessmentDirect peers
- Scale AI: Scale AI is the largest pure-play AI data labeling and evaluation platform serving frontier AI labs and enterprises. It directly competes with HumanSignal across data labeling, RLHF, evaluation, and AI research lab services, with deeper capital and government/defense exposure.
- SuperAnnotate: SuperAnnotate is an end-to-end data labeling and evaluation platform with multimodal support, model-assisted labeling, and enterprise workflow features. It competes directly with Label Studio Enterprise for enterprise AI teams.
- Encord: Encord provides a multimodal data labeling and evaluation platform for AI teams building computer vision and GenAI applications, with strong programmatic interfaces. It competes most directly with Label Studio Enterprise on programmable UI and multimodal workflows.
- Appen: Appen is a long-standing data annotation and crowdsourcing services provider serving both enterprise ML teams and frontier AI labs. It is comparable to HumanSignal Services in scale and breadth of human data collection across modalities.
- Datasaur: Datasaur is a data labeling and NLP platform with LLM-assisted annotation and team collaboration features. It overlaps directly with Label Studio's text and LLM evaluation capabilities for AI product teams.
- Labelbox: Labelbox is a horizontal enterprise data labeling and annotation platform with comparable multimodal capabilities, model-assisted labeling, and enterprise focus. It is a like-for-like competitor in the Label Studio Enterprise tier.
- Snorkel AI: Snorkel AI offers a data-centric AI platform combining programmatic labeling, weak supervision, and evaluation workflows for enterprise AI development. It is comparable in targeting enterprise AI teams with structured data and evaluation pipelines.
- V7 Labs: V7 Labs provides an AI data platform combining annotation, training data management, and model evaluation, particularly strong in computer vision. It is comparable to HumanSignal's multimodal platform positioning and enterprise customer focus.
- Surge AI: Surge AI is a frontier AI data platform focused on RLHF, preference data, and expert annotation for foundation model labs. It overlaps directly with HumanSignal's post-training data, evaluation data, and frontier AI lab service offerings.
Broad incumbents
- Amazon SageMaker Ground Truth: AWS SageMaker Ground Truth is a hyperscaler-integrated data labeling service bundled within the AWS ML platform. It is comparable to Label Studio Enterprise for cloud-native enterprises and represents a bundling threat as a broader incumbent.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
HumanSignal social profiles
Digital presenceHumanSignal compliance and trust
Trust signalCompliance4 records
HumanSignal financial estimates
Financial estimateRevenue estimate
Valuation estimate
HumanSignal leadership team
Management profileNumber of profiles
Profiles8 records
HumanSignal subsidiaries and ownership
Company hierarchySubsidiaries1 record
HumanSignal funding detail
Funding detailFunding overview
Funding rounds2 records
Investors6 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
HumanSignal M&A and investment
M&A and investmentM&A1 record
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about HumanSignal
What does HumanSignal do?
HumanSignal provides the Label Studio multimodal AI data labeling and evaluation platform, available as an open-source community edition (1M+ users), a self-serve Starter Cloud ($99/month), and an enterprise SaaS with security and compliance (SOC 2 Type II, HIPAA). The platform enables teams to annotate text, images, audio, video, time-series, and 3D data and to evaluate, benchmark, and fine-tune AI models through human-in-the-loop workflows and LLM-as-a-judge evaluators.
Is HumanSignal a public or private company?
HumanSignal is a private company. It is classified as venture growth investor backed and is currently operating.
When was HumanSignal founded?
HumanSignal was founded in 2019. It employs 51 to 100 people.
Where is HumanSignal based?
HumanSignal is headquartered in San Francisco, United States, in the North America region.
How does HumanSignal make money?
Four revenue lines are on record. Label Studio Enterprise SaaS Subscription is the primary driver. The others are label Studio Starter Cloud, humanSignal Services and AWS Marketplace Listing.
Who are HumanSignal's main competitors?
Direct peers on record are Scale AI, SuperAnnotate, Encord, Appen, Datasaur, Labelbox, Snorkel AI, V7 Labs and Surge AI. Amazon SageMaker Ground Truth is listed as a broad incumbent.
Does HumanSignal have an API?
Yes. HumanSignal provides programmatic interfaces (API and SDK) for training, evaluation, and fine-tuning workflows. The SDK allows teams to programmatically configure workflows, integrate models, and manage annotation pipelines. The platform supports secure connections to popular LLMs or custom models for predicting annotations, facilitating interactive labeling, and model evaluation. New version of API/SDK released with Label Studio 1.8.0 OSS. Additional capabilities include cloud storage data I/O, batch annotation, model integrations, and configuring webhooks. Developer documentation is at docs.humansignal.com.
What industry is HumanSignal in?
HumanSignal's product category is AI Data Labeling and Evaluation Platform. Its primary akta.pro industry code is HDAAALAC, Annotation Tooling & Workflow Management, with a secondary code of HDAAALAJ, RLHF, Human Feedback & Evaluation Data Tools. Its NAICS code is 5132 and its SIC code is 7372.