Hallo

Hallo is an AI-powered language assessment and language-learning company backed by Battery Ventures. Its enterprise platform delivers automated, AI-driven proficiency assessments across speaking, writing, listening, and reading in 80+ languages, with CEFR-aligned scoring, detailed feedback (fluency, vocabulary, grammar, pronunciation, coherence), real-time score reports and dashboards, and proctoring / anti-cheating for high-stakes hiring, placement testing, and employee development. Hallo integrates with major applicant-tracking systems (Greenhouse, Ashby, Workday, SmartRecruiters, Lever, SuccessFactors, Recruitee, and others) and runs assessments across 160+ countries, with a stated SOC 2 Type 2, ISO 27001, GDPR, and EU AI Act compliance posture. The company also operates a consumer language-learning app with AI tutors and native-speaker practice. Hallo does not publish a public developer API or OpenAPI specification; its integration surface is delivered through prebuilt ATS connectors and enterprise onboarding rather than a self-serve developer portal.

Hallo is profiled on the APIs.io network. Tagged areas include Company, Language Assessment, Language Learning, Artificial Intelligence, and Recruiting.

Hallo’s developer surface includes pricing, signup flow, engineering blog, support, and 7 more developer resources.

🌐 Visit website 📡 Source on GitHub

18.6/100 emerging ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-07-27 · rubric v0.5

0 APIs

CompanyLanguage AssessmentLanguage LearningArtificial IntelligenceRecruitingHuman ResourcesEducationSpeech Recognition

Kin Score

Kin Score How this is scored →
scored 2026-07-27 · rubric v0.5

Composite quality — 18.6/100 · emerging

Contract Quality 0.0 / 25

Developer Ergonomics 1.3 / 20

Commercial Clarity 10.5 / 20

Operational Transparency 0.0 / 13

Governance 0.0 / 12

Discoverability 6.8 / 10

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 15

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 0 / 7

Rate-Limit Signaling 0 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/hallo: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Get Started 1

Portal, sign-up, and the first successful call

SignUp

SignUp

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

Conformance

Conformance

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Compliance

Compliance

Operate 1

Status, limits, changes, and where to get help

Support

Support

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

TermsOfService

TermsOfService

PrivacyPolicy

PrivacyPolicy

Company 3

The organization behind the API

Website

Website

Blog

Blog

LinkedIn

Source (apis.yml)

aid: hallo
name: Hallo
description: Hallo is an AI-powered language assessment and language-learning company backed by Battery Ventures. Its enterprise
  platform delivers automated, AI-driven proficiency assessments across speaking, writing, listening, and reading in 80+ languages,
  with CEFR-aligned scoring, detailed feedback (fluency, vocabulary, grammar, pronunciation, coherence), real-time score reports
  and dashboards, and proctoring / anti-cheating for high-stakes hiring, placement testing, and employee development. Hallo
  integrates with major applicant-tracking systems (Greenhouse, Ashby, Workday, SmartRecruiters, Lever, SuccessFactors, Recruitee,
  and others) and runs assessments across 160+ countries, with a stated SOC 2 Type 2, ISO 27001, GDPR, and EU AI Act compliance
  posture. The company also operates a consumer language-learning app with AI tutors and native-speaker practice. Hallo does
  not publish a public developer API or OpenAPI specification; its integration surface is delivered through prebuilt ATS connectors
  and enterprise onboarding rather than a self-serve developer portal.
url: https://raw.githubusercontent.com/api-evangelist/hallo/refs/heads/main/apis.yml
accessModel:
  pricing: unknown
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Unknown
  confidence: low
  source: []
  generated: '2026-07-22'
  method: derived
image: https://www.hallo.ai/wp-content/uploads/Hallo@3x.png
x-type: company
x-source: vc-portfolio
x-backed-by:
- battery-ventures
x-tier: stub
x-tier-reason: portfolio-lead
specificationVersion: '0.20'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Language Assessment
- Language Learning
- Artificial Intelligence
- Recruiting
- Human Resources
- Education
- Speech Recognition
apis: []
common:
- type: DomainSecurity
  url: security/hallo-domain-security.yml
- type: Website
  url: https://www.hallo.ai/
- type: Pricing
  url: https://www.hallo.ai/pricing/
- type: SignUp
  url: https://www.hallo.ai/demo/
- type: TermsOfService
  url: https://www.hallo.ai/terms-of-service/
- type: PrivacyPolicy
  url: https://www.hallo.ai/privacy-policy/
- type: Blog
  url: https://www.hallo.ai/blog/
- type: Support
  url: https://www.hallo.ai/contact/
- type: Integrations
  url: https://www.hallo.ai/integrations/
- type: LinkedIn
  url: https://www.linkedin.com/company/hallo.
- type: Conformance
  url: conformance/hallo-conformance.yml
- type: Compliance
  url: conformance/hallo-conformance.yml
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com
- FN: APIs.json
  email: info@apis.io
x-enrichment:
  date: '2026-07-19'
  status: backfilled
  pass: local-v1
  note: backfilled from .gitignore signal + verified work evidence