/Companies

Mio

YC W16

Austin, US · Founded 2015 · 12 employees · 18 known investors

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Mio provides interoperability across collaboration platforms, enabling users to send messages, manage identities, share files, and initiate meetings across different systems.

Also known as Message.io (fka Prompt App, Inc.) · Message.io, Inc. · Message.io · Prompt · Prompt, Message.io

Developer ToolsEnterprise SoftwareSaaSMessagingTeam CollaborationUnited States of AmericaAmerica / CanadaPartly Remote

Founders & leadership· Y Combinator alumni (W16)

Mio was founded in 2015 by Tom Hadfield and James Cundle.

THTom Hadfield
Tom HadfieldCEOTom Hadfield founded Soccernet.com, which was acquired by ESPN, and later graduated from Harvard University in 2008. He is currently CEO of Mio, an enterprise messaging platform.
JCJames Cundle
James CundleCTOJames Cundle is a technical co-founder with over 20 years of experience in full-stack development and DevOps across multiple industries. He has expertise in security, compliance, and SOC2 implementation in early-stage environments.

Investors · 18

Four CitiesreportedNewton

How we know: Y Combinator's founder network · Not right? Tell us

Goldcrest CapitalreportedDallas

How we know: techcrunch.com · Y Combinator's founder network · Not right? Tell us

MistletoereportedTokyo

How we know: Y Combinator's founder network · Not right? Tell us

Social LeveragereportedScottsdale · $1M – $2M

How we know: Y Combinator's founder network · Not right? Tell us

Zoom VenturesreportedSan Jose

How we know: pulse2.com · Y Combinator's founder network · Not right? Tell us

Also in the syndicate · 1

iSEED SEA

Funding

SEC filings, press & company announcements

$8.7M disclosed across 1 of 3 rounds · 2021–2026

Source: company announcements and press reports — follow each round's link for the claim.

Founder mafia

2 people who came through Mio went on to found or lead other companies.

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Companies working in the same space as Mio.

Legal entities · 2

corporate structure
Message.io (fka Prompt App, Inc.)
Message.io, Inc.

In the news

Frequently asked questions

What does Mio do?
Mio provides interoperability across collaboration platforms, enabling users to send messages, manage identities, share files, and initiate meetings across different systems.
Who founded Mio?
Mio was founded by Tom Hadfield, James Cundle in 2015.
Who are Mio's investors?
Mio's investors include Cisco Investments, Eniac Ventures, Newtown Partners, Y Combinator, Capital Factory, Four Cities, Goldcrest Capital, Granite Asia and 9 more.
How much funding has Mio raised?
Mio has disclosed $8.7M raised across 1 of its 3 known rounds.
Where is Mio headquartered?
Mio is headquartered in Austin, US.