The Headless
Index
A research index scoring headless tooling on machine consumability.
Independent. Evidence-first. Versioned methodology.
Last refreshed MAY 21, 2026 · 295 scorecards published
- +API-first design intent
- +Headless mode of operation
- +MCP and agent integration posture
- +Schema observability (OpenAPI, GraphQL introspection)
- +Webhook and event-driven posture
- +JAIRF: 6 dimensions of agent-readiness (when an OpenAPI spec is published)
- −Pricing tiers
- −Customer support quality
- −Sales and marketing claims
- −UI polish or designer-friendliness
- −Vendor stability or fundraising
- −Anything we cannot verify from public evidence
Full rubric: /the-headless-index/methodology
By category
Content Management
Content management platforms exposing content creation, editorial workflows, and content delivery over APIs. Includes both products marketed as 'headless CMS' and traditional CMSes with strong API surfaces.
Commerce
E-commerce platforms exposing catalog, cart, checkout, order, and customer workflows over APIs. Includes both 'headless commerce' products and traditional e-commerce with comprehensive APIs.
Auth & Identity
Identity and access management platforms exposing authentication, authorization, user management, and session control over APIs. Headless mode means agents can manage identity programmatically without hosted login UIs.
Search & Vector DBs
Search engines and vector databases exposing indexing, querying, and ranking through APIs. Includes traditional search, hybrid search, and pure vector retrieval.
Payments
Payment processors, orchestrators, and subscription platforms handling transactions, refunds, and reporting via APIs.
Communications
Email, SMS, push, and chat platforms that send and receive messages programmatically. Includes transactional and marketing communication APIs.
Analytics & Events
Product analytics, event tracking, and customer data platforms that ingest events and expose queries via APIs.
Observability
Logging, tracing, and monitoring platforms that ingest telemetry and expose queries, dashboards, and alerts over APIs.
Object & File Storage
Object stores and file management platforms accessed entirely via API, including upload, retrieval, signed URLs, and lifecycle management.
Feature Flags & Config
Feature flag, remote config, and experimentation platforms exposing flag evaluation, targeting, and audit history over APIs and SDKs.
Project & Task Management
Issue trackers, project boards, and task management tools that expose CRUD over tickets, projects, and workflows via APIs.
Workflow & Automation
iPaaS, automation, and workflow orchestration platforms that connect APIs together and run scheduled or event-driven workflows.
AI Platforms
LLM providers, agent frameworks, and AI infrastructure platforms exposing models, embeddings, and tool-use over APIs.
Suggest a category
Headless tooling we haven't covered yet? Tell us what to look at next and why machines should be able to consume it.
Collect. Score. Publish.
A collector probes the vendor for OpenAPI, GraphQL introspection, SDKs, MCP servers, webhooks, and docs. Every observation is written to a raw evidence file with a timestamp.
The Headless Index (5 sub-criteria, 100 points) and JAIRF (6 dimensions, when an OpenAPI spec exists). Each score must cite a field path in the evidence file. No claim without a citation.
An editor writes a 250–400 word verdict and signs off. Scorecards publish with their full evidence trail. Vendors and readers can submit corrections via the public form (7-day SLA, public changelog).
Frequently asked
What is The Headless Index?
The Headless Index (THI) is a research index that scores software vendors on machine consumability: how well a product can be operated end-to-end by APIs, agents, and automated workflows rather than humans clicking a UI. Each scored vendor receives a Headless Index score (0 to 100), a JAIRF score (0 to 100, when an OpenAPI specification is published), and an aggregate band of A, B, C, D, or F. The methodology is published, versioned, and reproducible.
What does The Headless Index measure?
Five sub-criteria, each scored 0 to 20: API-first design intent, headless mode of operation, MCP and agent integration posture, schema observability (OpenAPI, GraphQL introspection), and webhook and event-driven posture. When the vendor publishes an OpenAPI specification we additionally compute JAIRF, the open-source Jentic API AI-Readiness Framework, which scores six dimensions of agent-readiness across foundational compliance, developer experience, AI usability, security, and AI discoverability.
What does The Headless Index not measure?
Pricing, licensing, customer support quality, sales and marketing claims, feature parity, UI polish, vendor stability (funding, acquisitions, leadership turnover), performance at scale, security audits beyond declared posture, or anything we cannot verify from public evidence. A high THI score is not a buy recommendation; it is one input scoped tightly to one question.
How are scores produced?
Three stages. A collector probes the vendor for OpenAPI, GraphQL introspection, SDKs, MCP servers, webhooks, and docs, writing every observation to a timestamped raw evidence file. Each sub-criterion is then scored against the published rubric and must cite a field path in the evidence file. Finally an editor writes a 250 to 400 word verdict and signs off. Every published scorecard ships with its full evidence trail.
Is The Headless Index editorially independent?
Yes. THI is published by Headless Systems, a publication of Bitvea (a Czech custom software company). Bitvea does not sell any product in the categories THI scores. Every scorecard discloses Bitvea's relationship with the vendor (none, past client, current client, partner, or integrator). We accept no payment for scoring, score adjustments, or removal, and no paid placement. Corrections are reviewed within seven business days and logged in the public changelog.
More questions: /the-headless-index/faq
Published. Versioned. Reproducible. Read the full rubric and the rules we use to assign bands.
THI Methodology v1 →The Headless Index is published by Headless Systems (Bitvea). Every scorecard discloses Bitvea's commercial relationship with the vendor. Verdicts are written before relationships are checked. JAIRF v1.0.0 by Jentic under Apache 2.0.