Tsumobi was a Y Combinator (Winter 2007) mobile messaging startup founded in Boston by Joshua Wilson and Adam Bouhenguel, and later backed by Andreessen Horowitz (a16z). It built a programming language that sat on top of J2ME so feature-phone applications could be downloaded and updated on the fly via URLs, aiming to fix the painful install and upgrade cycle of late-2000s mobile apps. The company is inactive (YC lists it as Inactive; reporting describes the startup as shut down after raising roughly $2M), the tsumobi.com domain no longer serves a website, and no public API, developer portal, SDKs, or specifications were found. This profile is retained as a historical a16z portfolio record in the API Evangelist network.
Tsumobi is profiled on the APIs.io network. Tagged areas include Company, Messaging, Mobile, J2ME, and Feature Phones.
aid: tsumobi
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/tsumobi.png
name: Tsumobi
description: Tsumobi was a Y Combinator (Winter 2007) mobile messaging startup founded in Boston by Joshua Wilson and Adam
Bouhenguel, and later backed by Andreessen Horowitz (a16z). It built a programming language that sat on top of J2ME so feature-phone
applications could be downloaded and updated on the fly via URLs, aiming to fix the painful install and upgrade cycle of
late-2000s mobile apps. The company is inactive (YC lists it as Inactive; reporting describes the startup as shut down after
raising roughly $2M), the tsumobi.com domain no longer serves a website, and no public API, developer portal, SDKs, or specifications
were found. This profile is retained as a historical a16z portfolio record in the API Evangelist network.
url: https://raw.githubusercontent.com/api-evangelist/tsumobi/refs/heads/main/apis.yml
x-type: company
x-source: vc-portfolio
x-backed-by:
- a16z
x-tier: stub
x-tier-reason: portfolio-lead
x-status: defunct
specificationVersion: '0.23'
created: '2026-07-17'
modified: '2026-07-21'
tags:
- Company
- Messaging
- Mobile
- J2ME
- Feature Phones
- Y Combinator
- Defunct
apis: []
common:
- type: DomainSecurity
url: security/tsumobi-domain-security.yml
- name: Website (historical, no longer serving)
type: Website
url: http://tsumobi.com
- name: Y Combinator Profile
type: Profile
url: https://www.ycombinator.com/companies/tsumobi
- name: GitHub Organization
type: GitHubOrganization
url: https://github.com/tsumobi
- name: LLMs.txt
type: LLMsTxt
url: llms/tsumobi-llms.txt
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
- FN: APIs.json
email: info@apis.io
x-enrichment:
date: '2026-07-21'
status: minimal
artifacts_added: 2
pass: local-v1
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