Katango

Katango was a Palo Alto, California mobile software startup whose smartphone app automatically organized a user's phone and social contacts into intelligent groups (circles) using clustering algorithms, so people could share and message the right subset of friends without manually building lists. The company was backed by Kleiner Perkins Caufield & Byers (through its sFund social initiative) and was acquired by Google in November 2011, with the team joining Google to work on the Google+ Circles experience. The standalone product was discontinued after the acquisition. This API Evangelist profile was created as a Kleiner Perkins portfolio lead; enrichment confirms the company is defunct with no public developer surface, API, or documentation. The katango.com domain now resolves to Google-owned infrastructure with no live site.

Katango is profiled on the APIs.io network. Tagged areas include Company, Consumer, Mobile, Social, and Contacts.

📡 Source on GitHub

0.0/100 minimal Agent 0/100 human only Full breakdown ↓
scored 2026-09-25 · rubric v0.23.0

0 APIs

Company Consumer Mobile Social Contacts Defunct Acquired GoogleKleiner Perkins

Kin Score

Kin Score How this is scored →
scored 2026-09-25 · rubric v0.23.0

Composite quality — 0.0/100 · minimal

Contract Quality 0.0 / 21

Developer Ergonomics 0.0 / 17

Access Clarity 0.0 / 17

Operational Transparency 0.0 / 11

Contract Governance 0.0 / 10

Discoverability 0.0 / 9

Regulatory Posture 0.0 / 15

Agent readiness — 0/100 · human only

Machine-Readable Contract 0 / 18

Agentic Access Contract 0 / 10

Documented Reversibility 0 / 6

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

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics could not be measured. We hold no machine-readable contract for this provider to read, so there is nothing to measure a write surface against. Excluded rather than scored zero: never-measured and measured-empty are different facts. Publishing an OpenAPI is what makes this facet — and several others — scorable at all.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/katango: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Source (apis.yml)

aid: katango
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: false
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - none
  generated: '2026-08-28'
  method: derived
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://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/katango.png
name: Katango
description: Katango was a Palo Alto, California mobile software startup whose smartphone app automatically organized a user's
  phone and social contacts into intelligent groups (circles) using clustering algorithms, so people could share and message
  the right subset of friends without manually building lists. The company was backed by Kleiner Perkins Caufield & Byers
  (through its sFund social initiative) and was acquired by Google in November 2011, with the team joining Google to work
  on the Google+ Circles experience. The standalone product was discontinued after the acquisition. This API Evangelist profile
  was created as a Kleiner Perkins portfolio lead; enrichment confirms the company is defunct with no public developer surface,
  API, or documentation. The katango.com domain now resolves to Google-owned infrastructure with no live site.
url: https://raw.githubusercontent.com/api-evangelist/katango/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- kleiner-perkins
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
x-status-reason: acquired-by-google-2011
x-acquired-by: google
x-enrichment-outcome: 'no-developer-surface: no API, docs, SDKs, MCP, or live site; katango.com resolves to Google-owned IP
  (142.250.191.14) with no valid TLS certificate for the host.'
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-19'
tags:
- Company
- Consumer
- Mobile
- Social
- Contacts
- Defunct
- Acquired
- Google
- Kleiner Perkins
apis: []
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

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