Slumber

An open-source terminal HTTP client with a TUI, a CLI and YAML request collections.

Verified facts: 3 of 3
Alternatives ranked: 5
Approved reviews: 0
Visits sent from here: 0

About Slumber

Slumber is a terminal-based HTTP client for working with REST and other HTTP APIs. It has two modes that share one configuration: an interactive terminal user interface for browsing requests, sending them and viewing responses, and a command-line interface for quick requests and scripts. Requests are defined in a YAML file called a request collection, with profiles for environments, templates and chained values, so the whole setup is easy to share and keep in version control. It is written in Rust, installs through Cargo, Homebrew or a shell or PowerShell installer, runs on Linux, macOS and Windows, and is free under the MIT licence. The trade-offs are that you set up collections by editing YAML rather than in a form, it focuses on HTTP rather than gRPC or WebSockets, and it is a small volunteer project. It suits developers who want a configurable, shareable request collection they can drive from the terminal.

Best for: Developers who want shareable YAML request collections they can use from the terminal.

What works

TUI and CLI share one config
Collections in YAML for version control
Profiles and chained values
Free, MIT licensed

Why people leave

Collections are edited as YAML by hand
HTTP only, no gRPC or WebSockets
Small volunteer project

Top Slumber alternatives

See all 5

1
Posting
A richer terminal interface with gRPC and GraphQL support.
66.5
2
ATAC
A Postman-style terminal client that imports Postman collections.
62.6
3
Hurl
Plain-text request files with assertions, for CI tests.
59.6
4
Bruno
A desktop app with collections stored as plain files.
57.5
5
httpYac
Runs .http request files from the CLI or VS Code.
57.2

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Slumber: common questions

Is Slumber free?

Yes. Slumber is free, open-source software.

Is Slumber open source?

Yes. The source code is on GitHub at LucasPickering/slumber.

What platforms does Slumber run on?

Slumber is available for Linux, macOS and Windows.

What are the best alternatives to Slumber?

The highest-ranked Slumber alternatives right now are Posting, ATAC and Hurl. See the full ranked list for pricing, platforms and verified facts.

See all 5 Slumber alternatives

Slumber facts

3 of 3 verified

License: MIT; Checked Oct 25, 2026github.com(opens source in a new tab); “License: MIT (MIT License).”
Modes: TUI and CLI; Checked Oct 25, 2026slumber.lucaspickering.me(opens source in a new tab); “It has two usage modes: Terminal User Interface (TUI) and Command Line Interface (CLI).”
Config format: YAML; Checked Oct 25, 2026slumber.lucaspickering.me(opens source in a new tab); “To that end, configuration is defined in a YAML file called the request collection .”