Unstable Build LLC
Unstable Build creates developer tools intended to challenge the status quo. Its single product, Rune, is a native, keyboard-driven development environment that combines terminal workflows, IDE capabilities, language intelligence, debugging, workspaces, and optional AI agents.
At a Glance
- Professional developers and terminal-first programmers
- Individual developers using AI coding agents
- Open-source developers and contributors
- Engineering teams and enterprises with remote or distributed development environments
AI Tools by Unstable Build LLC
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Rune
Open Source IDE Terminal Multiplexer
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Latest News
Rune 1.3.4 released, the latest release at research time
Rune 1.3 released with Kitty graphics, browser package, TypeScript beta support, Helix mode, headless mode, agent status bar, workspace restoration, and first community contributions
Rune 1.3.2 patch released with tighter workspace-config and command-approval security and crash fixes
Rune became open source under GPLv3 and announced a contributor revenue-sharing program
Products & Services
A native, GPU-accelerated, Unix-inspired IDE and terminal environment for macOS and Linux, with a command prompt, console, tiled terminal workspaces, code intelligence, debugging, extensions, and optional agents. It is open source under GPLv3.
An optional, provider-agnostic coding agent extension with chat commands and semantic tooling that lets agents query symbols, references, documentation, and diagnostics rather than relying only on grep.
A private development network connecting Rune nodes and allowing users to open workspaces on other machines through rune://; Free supports two connected nodes, Pro ten, and Enterprise unlimited.
A command-line companion exposing Rune's API to shells, scripts, and development hooks.
Market Position
Rune positions itself as a distinct native, terminal-integrated IDE rather than a VS Code fork or a standalone agent harness. Its FAQ contrasts it with Cursor, Windsurf, and Antigravity by emphasizing first-class support for external agent CLIs; with Claude Code, Codex, and OpenCode by emphasizing semantic IDE queries; with Zed by emphasizing its tiled terminal/workspace model; and with tmux by combining multiplexing with a native GUI, language intelligence, and debugging.
Leadership
Founders
Ernest Romero Climent
Engineer and primary creator of Rune. He began the project after his Vim Go-to-definition workflow broke in 2017, later worked at Uber, was laid off, and then went full-time on the product using severance savings.
Atzarí Surinyach
Co-founder of Unstable Build and co-builder of Rune; public biographical coverage identifies her as having worked with Ernest Romero Climent at Postmates and Uber before they started their own venture.
Executive Team
Ernest Romero Climent
Co-founder and lead creator of Rune
Engineer, former Uber employee, and author of the Rune development-history account; his GitHub account publishes the primary Rune releases.
Atzarí Surinyach
Co-founder
Co-founder of Unstable Build and member of the team building Rune; she authored the announcement introducing the Rune blog.
Founding Story
The product originated when Ernest Romero Climent's Vim Go-to-definition stopped working in 2017. He wanted a lightweight, terminal-oriented programming environment with modern IDE features, initially built a Go TUI/editor called Six, renamed it Ox in 2024, and later renamed it Rune; the project became a full-time product after his Uber layoff.
Business Model
Revenue Model
Self-funded company monetizing optional Rune Pro subscriptions and Enterprise plans. Rune Pro adds network capacity and premium support; Enterprise adds unlimited nodes, on-premises deployment, administration, SSO/SCIM, volume seats, and enterprise support. There are no ads, data sales, or per-token surcharges, and Rune does not host inference.
Pricing Tiers
Free downloads for macOS and Linux, GPLv3 source, community support, and Rune Network for up to 2 connected nodes.
Up to 10 connected Rune Network nodes and premium support.
Unlimited nodes, on-premises networking, managed deployment and updates, centralized billing/admin, SSO & SCIM, dedicated account management, enterprise support, and volume seats.
Target Markets
- Professional developers and terminal-first programmers
- Individual developers using AI coding agents
- Open-source developers and contributors
- Engineering teams and enterprises with remote or distributed development environments
- Professional software development for programmers who prefer terminal and keyboard-driven workflows
- AI-assisted coding with local agent execution and user-selected model providers
- Multi-agent and parallel development across workspaces, branches, and worktrees
- Remote development over SSH, containers, and headless machines
- Go, Python, Rust, Zig, TypeScript, JavaScript, and other multi-language projects
- Teams needing managed remote development nodes, SSO/SCIM, and enterprise support