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.
More than an index entry, but the surface is still mostly links rather than artifacts — the cohort most likely to move a full band from modest, well-targeted work.
API Evangelist profiles Hallo the way a machine reads it — 1 machine-readable artifact, pulled from the provider's own public surface and indexed so a developer, an analyst, or an AI agent can evaluate it against every other provider on the network.
Every provider in the network is reduced to the same set of machine-readable artifacts — OpenAPI contracts, event specifications, GraphQL schemas, runnable collections, pricing and rate-limit signals, security posture, OAuth scopes, and the agent surfaces (MCP servers and skills) that let software drive the API on its own. We profile them because the interface is the part of a company you can actually inspect: it is a truer signal of what a provider does than any marketing page. From those artifacts we compute the Kin Score — Hallo scores 18.6/100 (emerging), with a separate agent-readiness read of 0/100 (human only). The full breakdown is below, followed by every artifact we hold — each card links through to its machine-readable definition on apis.io.
Kin Score
This is the API Evangelist rating — a single, repeatable read computed from the artifacts on this page. Green fill is points earned; the red track is points possible, so every bar shows earned-versus-possible at a glance.
Kin Score
How this is scored →scored 2026-07-27 · rubric v0.5
How we profile Hallo
Each block below is one kind of artifact we hold for Hallo. For each we say what it is and why it earns a place in the profile, then list every one we've indexed — capped at two rows, scroll within the panel for the rest.
Security Posture 1
Authentication, domain security, vulnerability disclosure, and trust-center signals — the evidence that a provider takes security seriously enough to document it. We profile it because you can't govern what you can't see.
Authentication, domain security, vulnerability disclosure, and trust-center signals.
Resources
Every other property we hold for Hallo — documentation, portals, status pages, policies, and corporate surface — grouped by the job it does, following the integrator's arc from getting started to running in production.
Get Started 1
Portal, sign-up, and the first successful call
Design & Contract 1
Pagination, idempotency, versioning, errors, and events
Access & Security 2
Authentication, authorization, and security posture
Operate 1
Status, limits, changes, and where to get help
Commercial 3
Pricing, plans, and the legal terms of use
Company 3
The organization behind the API
← All providers · Data indexed from github.com/api-evangelist/hallo · machine-readable index on apis.io