HashiCorp Co-Founder Mitchell Hashimoto Launches Superlogical, a Server-Side Terminal Multiplexer Built on Ghostty

Overview

Mitchell Hashimoto, the co-founder of HashiCorp, has started a new company called Superlogical, announcing on July 29, 2026 that it will begin by building a server-side terminal multiplexer designed to replace tools such as tmux, Zellij, and GNU Screen. The venture builds directly on libghostty, the terminal engine Hashimoto extracted from Ghostty, the terminal emulator he created and later donated to a non-profit.

What We Know

Hashimoto left HashiCorp in 2023, the company he had co-founded, writing that it was “after 11 years” at the company. Since then, he says his primary focus has been fatherhood and philanthropy, while he continued building software “for the love of it,” pouring that effort into Ghostty. According to his post, Ghostty “started as a personal project I thought I’d throw away, but instead grew into a project with millions of daily users, a large community with a wonderful group of core maintainers, and a reusable library powering impactful software as well as fun software.” He donated the entire project to a federally recognized non-profit in 2025, and it is now run by “about a dozen core maintainers, almost 50 localization team members, and another dozen community moderators,” per Hashimoto’s own account.

Superlogical’s first product is a terminal multiplexer — software that manages multiple terminal sessions inside a single interface. According to The Register, Hashimoto argues that existing multiplexers such as tmux, Zellij, and GNU Screen are “all too slow” because they “duplicate everything the user types and have to constantly reconcile local and remote states,” adding that “even slapping a modern terminal such as Kitty, Alacritty or Ghostty in front of a multiplexer won’t do much to speed ops.”

Superlogical’s architecture flips that model. Per The Register’s reporting, “the client sends terminal input to the server, much like an SSH session, while the server maintains the persistent session state,” an approach that “lets users disconnect and return later, while a smart client handles rendering and scrolling locally rather than waiting for a network round trip.” Hashimoto acknowledged the tradeoff: “It does require that every connecting client be a very smart, high-functioning, compliant client, such as one built on libghostty.”

On its own site, Superlogical describes the multiplexer as keeping “multiple terminal blocks organized inside a long-lived session, so users can close the application, reconnect from another device, and pick up exactly where they left off.” Sessions will be reachable “through the web and native macOS/iOS applications,” with live session sharing “built in from the start,” and the company says it is fixing common annoyances in existing tools by making “scrollback, selection, and scrolling all work natively.”

The company frames the multiplexer as only the first step of a three-part plan, listed on its site as: “1. Build an incredible multiplexer. 2. Make everything in it composable. 3. Make it safe and operable in production.” Superlogical says it will build on libghostty “exactly as it was designed to be used: as a public building block for terminal applications,” consuming the same MIT-licensed components available to everyone else and continuing “to upstream shared terminal work so every libghostty consumer can benefit.” Hashimoto stressed that Ghostty itself “remains a non-profit; its mission, governance, license, technical goals, and roadmap do not change.”

Superlogical’s founding team consists of four people, according to the company’s website: Hashimoto himself, described as the creator of Ghostty and co-founder of HashiCorp who “created Vagrant, Terraform, Vault, and more” and “spent more than a decade as CEO and CTO from its earliest days through its IPO”; Jack Pearkes, described as HashiCorp’s “very first employee” and its former VP of Engineering and VP of R&D; Alasdair Monk, described as “Head of Experience at Poolside, VP of Design at Vercel, and a senior design leader at HashiCorp and Heroku”; and Hector Simpson, described as having “designed apps, services, and agentic experiences at Poolside” after shipping “developer-first products at Heroku, HashiCorp, Clearbit, and Vercel.”

The company lists its financial backers as Notable Capital and Amplify Partners, along with a group of individual investors: Aaron Levie, Armon Dadgar, Dax Raad, Greg Foster, Guillermo Rauch, Jacob Thornton, Mario Zechner, Merrill Lutsky, Patrick Collison, Paul Copplestone, Stephen Haney, Steve Ruiz, Tobias Lütke, and Tomas Reimers, per Superlogical’s site. No funding amount or valuation was disclosed.

The terminal multiplexer is not yet available; Superlogical is only collecting signups, saying it will notify people “when our beta for the terminal multiplexer is available, and any OSS releases along the way,” according to the company’s site.

What We Don’t Know

Neither Hashimoto’s post nor the company site discloses a funding amount, a valuation, or a beta release date. Hashimoto has also declined to detail the rest of Superlogical’s roadmap beyond the multiplexer, writing only that “the terminal multiplexer isn’t the entire vision” and that he is “not ready to share more yet.” The Register reported that Gergely Orosz, author of the Pragmatic Engineer newsletter, speculated the company could “be building an AI-native ‘agentic operating system’ that sits a level above OSes” — a characterization from Orosz, not a claim Hashimoto or Superlogical has confirmed.