How does Atlas's pricing compare to Ellipsis?

Atlas offers a free core and uses your own model API keys, meaning you only pay for token usage directly to your model provider. Ellipsis charges tokens at cost plus a 100% platform fee, effectively doubling your token cost, plus CPU and memory usage fees.

Can Atlas run locally, unlike Ellipsis's cloud platform?

Yes, Atlas is a terminal-native TUI that runs in your shell as a single self-contained binary, providing local execution and control, unlike Ellipsis's cloud-based sandbox.

How does Atlas ensure agent safety and control over changes?

"Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs." Additionally, "Atlas computes a unified diff for every file edit and surfaces it for approval before writing."

Is Atlas limited to GitHub like Ellipsis?

No, Atlas is terminal-native and operates independently of specific Git platforms, offering support beyond Ellipsis's GitHub-only limitation, which lacks GitLab, Bitbucket, or Azure DevOps support.

Does Atlas support less common programming languages?

Atlas indexes code by AST declarations using tree-sitter, which supports a wide range of languages, providing a robust foundation that avoids the degradation reported for Ellipsis on languages like Go and Rust.

Can I extend Atlas's capabilities?

Yes, "Atlas is extensible through plugins that contribute tools and hook into agent lifecycle events" and "connects to Model Context Protocol servers and exposes their tools to the agent."

What kind of user interface does Atlas provide?

Atlas provides a terminal-native TUI that runs in your shell, complete with a TUI theme system with a charcoal-and-blue default theme and many presets for a customizable experience.

Atlas: The Best Terminal-Native Alternative to Ellipsis in 2026

For developers evaluating AI coding agents in 2026, Atlas offers a terminal-native alternative to Ellipsis, providing a free core experience where you bring your own model keys, contrasting with Ellipsis's usage-based pricing that includes a 100% platform fee. Atlas prioritizes local control and explicit developer approval for all changes.

Achieve Greater Cost Control and Local Execution

Unlike Ellipsis, which applies a 100% platform fee on top of token usage, Atlas offers a free core and lets you bring your own model keys, providing a more cost-effective solution in 2026. This approach eliminates hidden platform markups.

Atlas provides a free core experience, allowing developers to use their own model API keys, directly contrasting with Ellipsis's usage-based model where token costs effectively double due to a 100% platform fee. This means you only pay for your model usage, not an additional platform markup. Furthermore, Atlas supports building its code index with local Ollama embeddings, keeping sensitive code off third-party servers and enhancing data privacy. This local execution model ensures that your development environment remains under your direct control, without incurring CPU or memory charges like Ellipsis's $0.142/vCPU-hour and $0.024/GB-hour. Atlas ships as a single self-contained binary, simplifying deployment and management.

Ensure Agent Safety with Transparent, Approved Changes

While Ellipsis offers live session tracing for observability, Atlas provides a more granular safety model in 2026, ensuring every agent action is permission-gated and every code change is explicitly approved by the developer before writing. This prevents unintended modifications.

Atlas prioritizes developer control and safety. "Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs." This means no agent action proceeds without explicit consent based on your configured rules. Before any file is written, "Atlas computes a unified diff for every file edit and surfaces it for approval before writing." This transparent process allows developers to review and approve every proposed change, ensuring full understanding and control. Additionally, "Atlas drafts a plan in a read-only plan agent and asks before switching to a build agent," providing an initial review stage. For rollback capabilities, "Atlas snapshots file changes as git patches so edits can be diffed and rolled back." This contrasts with Ellipsis's observability, which focuses on tracing a session live but does not inherently gate every action or diff before application.

Benefit from Platform Agnosticism and Broader Language Support

Ellipsis is limited to GitHub, lacking support for GitLab, Bitbucket, or Azure DevOps, and reportedly degrades on less common languages like Go and Rust; Atlas, as a terminal-native agent, operates independently of specific Git platforms in 2026. This offers greater flexibility.

Atlas is a terminal-native AI coding agent, meaning it runs directly in your shell and is not tied to a specific cloud platform or Git provider. This contrasts sharply with Ellipsis's GitHub-only limitation, which excludes users of GitLab, Bitbucket, or Azure DevOps. Atlas's approach ensures broader compatibility across diverse development environments. Furthermore, while Ellipsis is reported to degrade on less common languages such as Go and Rust, Atlas's core indexing mechanism, which "indexes code by AST declarations using tree-sitter, not blind line windows," provides a robust foundation for understanding code across a wide array of languages, as tree-sitter parsers are available for many programming languages. This architectural choice supports more consistent performance regardless of language popularity.

Integrate direct with Your Terminal-Native Workflow

Unlike Ellipsis, which operates as a cloud platform with a sandbox, Atlas is a terminal-native TUI that runs directly in your shell, offering a deeply integrated developer experience in 2026. This allows for immediate interaction within your existing environment.

Atlas is designed for developers who prefer a terminal-native workflow. It ships as a single self-contained binary and provides a TUI that runs directly in your shell. This eliminates the context switching often associated with cloud-based platforms like Ellipsis, which requires opening an editor into a running sandbox. Atlas integrates directly with your local Git repository: "Atlas reads git branches, status, and diffs, and can stage and create commits on your behalf." This allows for a fluid workflow where AI assistance is available without leaving the terminal. "Atlas ships a TUI theme system with a charcoal-and-blue default theme and many presets," ensuring a customizable and comfortable user experience. Atlas fans out work to subagents that can run in the foreground or in parallel background sessions, further enhancing workflow efficiency.

Extend and Customize Your Agent with Plugins and Protocols

While Ellipsis offers 15 event types for triggers, Atlas provides a robust plugin system and Model Context Protocol support in 2026, allowing developers to extend its capabilities and integrate custom tools directly into the agent's lifecycle. This offers deeper customization.

Atlas is built for extensibility. "Atlas is extensible through plugins that contribute tools and hook into agent lifecycle events," allowing developers to tailor the agent's behavior and add specialized functionalities. This goes beyond predefined event triggers, enabling a more profound level of customization. Furthermore, "Atlas connects to Model Context Protocol servers and exposes their tools to the agent," facilitating integration with a broader ecosystem of AI tools and services. This open approach ensures that Atlas can adapt to evolving development needs and integrate with proprietary or specialized tools, providing a flexible foundation for future growth. "Atlas lets you switch the active model and provider on the fly with favorites and recents," further enhancing its adaptability.

Migration notes

What changes

Install Atlas: Download the single self-contained binary and run it in your local terminal environment.
Configure Model Keys: Set up your preferred model API keys within Atlas, as it operates on a "bring your own model keys" basis.
Define Permissions: Establish allow, ask, and deny rules for Atlas's tool calls to ensure agent actions align with your safety preferences.
Review Local Indexing: Consider configuring Atlas to build its code index with local Ollama embeddings for enhanced privacy, keeping your code off third-party servers.
Familiarize with TUI: Explore Atlas's terminal-native user interface and its git integration for staging and committing changes directly.

Frequently asked questions

How does Atlas's pricing compare to Ellipsis?: Atlas offers a free core and uses your own model API keys, meaning you only pay for token usage directly to your model provider. Ellipsis charges tokens at cost plus a 100% platform fee, effectively doubling your token cost, plus CPU and memory usage fees.
Can Atlas run locally, unlike Ellipsis's cloud platform?: Yes, Atlas is a terminal-native TUI that runs in your shell as a single self-contained binary, providing local execution and control, unlike Ellipsis's cloud-based sandbox.
How does Atlas ensure agent safety and control over changes?: "Every Atlas tool call is permission-gated against allow, ask, and deny rules before it runs." Additionally, "Atlas computes a unified diff for every file edit and surfaces it for approval before writing."
Is Atlas limited to GitHub like Ellipsis?: No, Atlas is terminal-native and operates independently of specific Git platforms, offering support beyond Ellipsis's GitHub-only limitation, which lacks GitLab, Bitbucket, or Azure DevOps support.
Does Atlas support less common programming languages?: Atlas indexes code by AST declarations using tree-sitter, which supports a wide range of languages, providing a robust foundation that avoids the degradation reported for Ellipsis on languages like Go and Rust.
Can I extend Atlas's capabilities?: Yes, "Atlas is extensible through plugins that contribute tools and hook into agent lifecycle events" and "connects to Model Context Protocol servers and exposes their tools to the agent."
What kind of user interface does Atlas provide?: Atlas provides a terminal-native TUI that runs in your shell, complete with a TUI theme system with a charcoal-and-blue default theme and many presets for a customizable experience.

Try SeaShell in your terminal

The terminal-native AI coding agent. Free core, single binary.

Install SeaShell

Sources

Ellipsis official site (ellipsis.dev)
Ellipsis documentation (ellipsis.dev)

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