Native for macOS · no Electron · no accountNative macOS · no Electron

The REST client that feels like a Mac app.

SwiftUI and SwiftData, top to bottom. Launches in under a second, keeps your requests on your Mac, and never asks you to sign in.

Acme Labs · incident-tickets›InfoENVStaging⌄

GETInfo✕POSTCreate ticket

GET⌄{{BASE_URL}}{{TICKETS_PATH}}/info⋯Send⌘↵

https://api.acme-labs.dev/customer/incident/tickets/v1/info

DescriptionParamsHeadersBodyAuthVariablesResponse

200 OK218 ms·1.4 KBBodyHeadersTimings

{
  "service": "incident-tickets",
  "version": "1.14.2",
  "status": "UP",
  "dependencies": [
    { "name": "postgres", "latencyMs": 12 },
    { "name": "gateway", "latencyMs": 48 }
  ]
  "status": "UP"
}

Connected⌘KCommand palette

Open, then work

Cold launch under a second, no splash screen, no update nag. A Swift binary that respects your dock.

Goes with the system

Command palette on ⌘K, Spotlight indexing, Shortcuts actions, real menu bar, real sheets.

Your data stays home

SwiftData on disk. iCloud sync is opt-in and end-to-end Apple's. We run no servers of our own.

Environments

Switch environment, not fifteen URLs.

Pick the environment in the toolbar; every {{variable}} in the request resolves live, highlighted in amber, with the final URL rendered right under the field. Edit the whole set in a sheet without leaving the request.

EnvironmentsStaging⌄

BASE_URLhttps://api.acme-labs.dev

TICKETS_PATH/customer/incident/tickets/v1

SESSION•••••••••••••••••• captured

CUSTOMER_IDcus_8f3k2m

CancelSave

Response viewer

See where the 218 ms went.

Every response comes back with a waterfall — DNS, TCP, TLS, request, waiting, download — next to a JSON viewer that folds, filters and searches without freezing on a 2 MB body.

200 OK218 ms totalBodyHeadersTimings

DNS14 ms

TCP22 ms

TLS39 ms

Request8 ms

Waiting103 ms

Download32 ms

Command palette

Everything is one `⌘K` away.

Create, navigate, execute, or jump back through history — grouped, fuzzy-matched, keyboard-first. The palette is the fastest way to send a request you haven't opened yet.

tick

Execute

GETShow ticket catalog↵

POSTCreate ticket

Navigate

svc-incident-tickets

History

GETInfo2002 min ago

Migrate & automate

Bring what you have. Run it on a schedule.

Import from Postman, OpenAPI or a pasted cURL, and export back out as code in five languages. The collection runner adds per-step assertions and a report you can hand to someone else.

Import

Postman collections v2.1
OpenAPI 3.x
Paste a cURL command

Generate

cURL
Swift
Python
JavaScript
Go

Runnerincident-tickets · 6 steps6 passed

GETInfostatus = 200 · 218 ms

POSTCreate ticketbody.id exists · 340 ms

PATCHUpdate ticketstatus = 204 · 96 ms

Advanced · MCP server

Your agent can send the request too.

Mariner ships an embedded MCP server. Point Claude Code — or any MCP client — at it, and it can read your collections, resolve environments and execute requests, with the same local data and no API keys leaving your Mac.

Off by default. One toggle, scoped per workspace.

Terminal

$ claude mcp add mariner \
  --transport stdio \
  -- /Applications/Mariner.app/Contents/MacOS/mariner-mcp-- mariner-mcp

Added MCP server mariner. Tools:
list_collections, get_request, run_request, list_envs

iCloud syncOpt-in, per workspaceOpt-in
WorkspacesSeparate clients, separate envsSeparate envs
Local historyEvery send, searchable
AuthOAuth2, Bearer, API key, BasicOAuth2 · Bearer · Basic
Languagesen · es · pt-BR
SwiftUI nativeNo web view anywhere
Apple SiliconUniversal, macOS 14+macOS 14+
Post-response captureTokens into variables

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