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.

🌐 Visit website 📡 Source on GitHub

5.0/100 minimal ▬ flat Agent 0/100 human only Full breakdown ↓
scored 2026-08-21 · rubric v0.12.0

0 APIs

Company Consumer Mobile Social Contacts Defunct Acquired GoogleKleiner Perkins

Kin Score

Kin Score How this is scored →
scored 2026-08-21 · rubric v0.12.0

Composite quality — 5.0/100 · minimal

Contract Quality 0.0 / 25

Developer Ergonomics 0.0 / 20

Access Clarity 0.0 / 20

Operational Transparency 0.0 / 13

Contract Governance 0.0 / 12

Discoverability 5.0 / 10

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

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/katango: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

Source (apis.yml)

aid: katango
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

Work with this as data

Every provider here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for providers

9 MCP tools reach this

find_providersBrowse and filter every provider in the catalog.
get_provider_artifactsEvery artifact this provider publishes, grouped by type.
get_provider_operationsEvery operation across all of their OpenAPIs — one call instead of parsing every spec.
get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
get_provider_ratingPRO — composite, band, trend and facet scores.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools

Call it yourself

curl for this page

This provider

curl "https://apis.io/api/v1/providers/katango"

All providers

curl "https://apis.io/api/v1/providers?limit=25"

Every operation they expose

curl "https://apis.io/api/v1/providers/katango/operations?limit=25"

How their score was established

curl "https://apis.io/api/v1/providers/katango/evidence"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.