Jam.gg (formerly Piepacker)
DefunctYC S20San Francisco, US · Founded 2020 · 4 employees on LinkedIn · 2 known investors
Jam.gg is a web platform for playing multiplayer games with friends online, featuring retro, indie, and board game titles optimized for low-bandwidth connections.
Also known as Piepacker · Jam · Jamgg
Founders & leadership· Y Combinator alumni (S20)
Jam.gg (formerly Piepacker) was founded in 2020 by Benjamin Devienne and Jules Testard.
Investors · 2
Company profile
researched Aug 2026Jam.gg, formerly known as Piepacker, is a web-based platform that combines online multiplayer gaming with video chat, allowing people to play "couch" games together remotely without shared hardware. The catalogue spans retro titles, PC indie games and board games, and sessions run directly in the browser with no download or installation required. Built-in voice and video chat, customizable game rooms and cross-platform compatibility are core parts of the product.
The company positions accessibility as its central design goal, relying on a patented technology that it states reduces internet bandwidth requirements by a factor of about 15 on average, enabling play on constrained connections. The company was founded in 2020 and participated in Y Combinator's Summer 2020 batch, operating from San Francisco. In 2023 the project branched into two separate companies: Jam on one side and Onibi (onibi.gg) as its own entity, with Y Combinator on both cap tables.
Founding story
Co-founded by Benjamin Devienne, previously in gaming at EA, Ubisoft and Gameloft, where he created and scaled data science, and later Head of Analytics at Facebook and Head of Research at Twitch; and Jules Testard, a former academic researcher at UCSD and software engineer at AWS, Docker and Madhive.
Business model
Consumer-facing platform offered on a freemium basis, with a free tier starting at $0 per month and paid features above it.
Freemium consumer subscription/pricing model beginning at $0 per month.
Latest developments
In 2023 the project separated into two companies, Jam and Onibi (onibi.gg); Y Combinator subsequently lists Jam.gg (formerly Piepacker) as inactive.
▸Full profile — market position, technology, go-to-market, geography, history
Market position
Operates in the cloud gaming, gaming and social categories as a Y Combinator Summer 2020 company.
Hyper-accessibility through bandwidth reduction technology, instant browser-based play without downloads, and a library combining retro, PC indie and board games with integrated video chat.
Technology
Browser-based streaming of multiplayer games with integrated voice and video chat and customizable game rooms, built on patented technology the company says cuts required internet bandwidth by roughly 15x on average, supporting low-latency play across platforms.
Go-to-market
Casual gamers, groups of friends who want to play together remotely, and families; also cited for team-building and remote employee engagement uses.
Geography
Headquartered in San Francisco, with a browser-delivered service accessible to remote players.
History
Founded in 2020 as Piepacker and part of Y Combinator's Summer 2020 batch, the company later operated as Jam.gg. In 2023 the project split into two companies, Jam and Onibi, both with Y Combinator on the cap table. Y Combinator lists the company's status as inactive and its founders as former founders.
Compiled by commissioned research from 2 cited public sources — announcements, filings, and press listed under research sources below.
Key figures
latest reportedCompany-reported or press-reported figures, each dated to when it was claimed — not independently audited.
Timeline · 1
launches, deals, and filingsThe project branched out into two companies in 2023, with Jam on one side and Onibi (onibi.gg) becoming its own company; Y Combinator is on both cap tables.
Dated company events from announcements, filings, and press; legal rows summarize public dockets and regulator releases.
In the news
▸Research sources · 2
primary sources listed
- Jam.gg (formerly Piepacker): Jam.gg, play couch games online with friends | Y Combinatorycombinator.com · web
2 public sources were cited for this profile; the first-party ones are listed here.
Frequently asked questions
- What does Jam.gg (formerly Piepacker) do?
- Jam.gg, formerly Piepacker, is a browser platform for playing retro, indie and board multiplayer games with friends online.
- Who founded Jam.gg (formerly Piepacker)?
- Jam.gg (formerly Piepacker) was founded by Benjamin Devienne, Jules Testard in 2020.
- Who are Jam.gg (formerly Piepacker)'s investors?
- Jam.gg (formerly Piepacker)'s investors include Y Combinator, Makers Fund.
- Where is Jam.gg (formerly Piepacker) headquartered?
- Jam.gg (formerly Piepacker) is headquartered in San Francisco, US.

