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ATAC alternatives: 5 apps ranked by verified data

Facts checked Oct 25, 2026AppBreakup editorialHow we rank

Common reasons people leave ATAC: fewer features than desktop clients, and young, volunteer-maintained project. We ranked 5 alternatives by how directly each one replaces ATAC, then by reviews, real visits and how recently each app's facts were checked against its own website. Posting currently ranks first.

Quick comparison

#AppPricingOpen sourcePlatformsVerified factsScore
1Posting logoPostingOpen sourceYesLinux, macOS, Windows4 of 466.5
2Slumber logoSlumberOpen sourceYesLinux, macOS, Windows3 of 362.6
3Bruno logoBrunoOpen sourceYesWindows, macOS, Linux3 of 359.4
4xh logoxhOpen sourceYesLinux, macOS, Windows3 of 355.3
  1. Posting logo

    1. PostingTop pick

    Best for: Keyboard-driven developers who want a full API client in the terminal

    Open sourceLinux, macOS, Windows

    66.5

    score / 100

    Why switch from ATAC

    A more polished terminal client with themes and gRPC support.

    Pros

    • Full interface in the terminal, works over SSH
    • Collections as YAML files in Git
    • HTTP, GraphQL and gRPC
    • Free, Apache 2.0 licensed

    Cons

    • Terminal interface takes getting used to
    • No built-in team sync
    • Some features still in beta
    Visit Posting Details and reviews
    How this score is calculated
    Editorial fit ×0.3100
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Posting a good ATAC alternative?

    Verified facts

    4 of 4 verified
    License
    Apache-2.0
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Protocols
    HTTP, GraphQL, gRPC
    Checked Oct 25, 2026posting.sh(opens source in a new tab)
    Git-friendly
    Yes
    Checked Oct 25, 2026posting.sh(opens source in a new tab)
    Open source
    Yes
    Checked Oct 25, 2026posting.sh(opens source in a new tab)
  2. Slumber logo

    2. Slumber

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

    Open sourceLinux, macOS, Windows

    62.6

    score / 100

    Why switch from ATAC

    Another Rust terminal client with YAML collections and a CLI mode.

    Pros

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

    Cons

    • Collections are edited as YAML by hand
    • HTTP only, no gRPC or WebSockets
    • Small volunteer project
    Visit Slumber Details and reviews
    How this score is calculated
    Editorial fit ×0.387
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Slumber a good ATAC alternative?

    Verified facts

    3 of 3 verified
    License
    MIT
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Modes
    TUI and CLI
    Checked Oct 25, 2026slumber.lucaspickering.me(opens source in a new tab)
    Config format
    YAML
    Checked Oct 25, 2026slumber.lucaspickering.me(opens source in a new tab)
  3. Bruno logo

    3. Bruno

    Best for: Developers who want API collections stored in Git, offline

    Open sourceWindows, macOS, Linux

    59.4

    score / 100

    Why switch from ATAC

    A desktop app that also stores collections as files offline.

    Pros

    • Collections are plain files in Git
    • No cloud account required
    • Imports Postman collections

    Cons

    • No built-in cloud collaboration
    • Younger plugin ecosystem
    Visit Bruno Details and reviews
    How this score is calculated
    Editorial fit ×0.369
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.15100
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is Bruno a good ATAC alternative?

    Verified facts

    3 of 3 verified
    Open source
    Yes
    Checked Oct 24, 2026github.com(opens source in a new tab)
    Offline-first
    Yes
    Checked Oct 24, 2026usebruno.com(opens source in a new tab)
    Git-friendly
    Collections stored as files
    Checked Oct 24, 2026usebruno.com(opens source in a new tab)
  4. xh logo

    4. xh

    Best for: Terminal users who like HTTPie's syntax but want a fast single binary

    Open sourceLinux, macOS, Windows

    55.3

    score / 100

    Why switch from ATAC

    A fast single-command HTTP client if you don't need collections.

    Pros

    • Very fast startup
    • HTTPie-compatible syntax
    • Single binary with no runtime
    • Free and MIT licensed

    Cons

    • Not every HTTPie feature is supported
    • No collections or graphical interface
    • Volunteer-maintained
    Visit xh Details and reviews
    How this score is calculated
    Editorial fit ×0.363
    Reviews ×0.363
    Clicks (90 days) ×0.150
    Freshness ×0.1585
    Votes ×0.150

    0 counted reviews, 0 up and 0 down votes. Full formula

    Is xh a good ATAC alternative?

    Verified facts

    3 of 3 verified
    License
    MIT
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Purpose
    Sending HTTP requests
    Checked Oct 25, 2026github.com(opens source in a new tab)
    Repository status
    Active
    Checked Oct 25, 2026github.com(opens source in a new tab)

The best ATAC alternative for…

The highest-ranked app in this list for each need.

Posting logo

Best ATAC alternative for most people

Posting

A more polished terminal client with themes and gRPC support.

Slumber logo

Best ATAC alternative for a free option

Slumber

Another Rust terminal client with YAML collections and a CLI mode.

Postman logo

Best ATAC alternative for a free plan you can upgrade

Postman

The graphical original, with team workspaces and docs.

Bruno logo

Best ATAC alternative for open source

Bruno

A desktop app that also stores collections as files offline.

xh logo

Best ATAC alternative for Mac

xh

A fast single-command HTTP client if you don't need collections.

Posting logo

Best ATAC alternative for Windows

Posting

A more polished terminal client with themes and gRPC support.

Posting logo

Best ATAC alternative for Linux

Posting

A more polished terminal client with themes and gRPC support.

Postman logo

Best ATAC alternative for working in the browser

Postman

The graphical original, with team workspaces and docs.

ATAC alternatives: common questions

What is the best alternative to ATAC?

Posting ranks first right now. A more polished terminal client with themes and gRPC support. Slumber and Bruno follow it in our ranking.

Is there a free alternative to ATAC?

Yes. Posting (open source), Slumber (open source), Bruno (open source) and xh (open source) have a free option. Check each app's verified facts for current plan limits.

Is there an open-source alternative to ATAC?

Yes: Posting, Slumber, Bruno and xh.

Which ATAC alternatives work on Linux?

Posting, Slumber, Bruno, xh and Postman run on Linux.

Why do people switch from ATAC?

The complaints we hear most: fewer features than desktop clients; young, volunteer-maintained project; terminal interface has a learning curve.

How is this list ranked?

Every app is scored with the same published formula: how directly it replaces ATAC, reviews (weighted by verification), visits from AppBreakup, how recently its facts were checked against its own website, and reader votes.