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One

Holds one connection per app in your account and gives each agent a scoped, revocable grant to act through it.

Developer toolsAPICLIFor developers
withone.ai ↗GitHubX
At a glanceswept 2026-10-12

≈ 736visits/mo

Little sign of use · estimate, read 2026-10-12

  • One736
  • #1 Microsoft135M
  • Developer tools median26
For
developers and teams connecting AI agents to their apps and controlling what each agent may do
Price
Free plan · From $29/mopricing page, read 2026-10-13 ↗
Activity
Actively maintainedrelease 2 days ago · site updated 2 days ago
Company
One Systems, Inc. · since 2024privacy policy · per their site
Runs as
APICLI
AlternativesSet it up for my teamIs One yours? Claim the card →
What people do with itread off withone.ai on 2026-10-13
  • connect apps once and let every agent reuse them
  • scope each agent's access to specific actions per app
  • review an audit trail of what each agent did
The companyeach fact with its source · read 2026-10-13
Your datawhat they publish, each line with its page · read 2026-10-13

“We do not use your content or Customer Data to train AI models.”

privacy policy ↗

These are One's own statements, read from its pages. We did not audit them. A line that is missing was not found on the pages we read; it does not mean the practice is absent.

How a program reaches itfound, not claimed · read 2026-10-13
  • MCP serverai.withone/mcpverified in the MCP registry
  • Stateanswers, requires sign-inchecked 2026-10-13
  • Address to connectmcp.withone.ai/mcp
  • OpenAPI spec161 pathsthe spec ↗
  • API docswithone.ai/docs/api-reference/introductionthe vendor's page ↗
  • MCP docswithone.ai/products/mcpthe vendor's page ↗

MCP server details →

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.

Alternatives in Developer toolsby use, among tools still maintained

Figure and bar: visits/mo, estimate · year: online since

All Developer tools tools →

Questions this page answers
  • What is One?

    Holds one connection per app in your account and gives each agent a scoped, revocable grant to act through it. It is listed in the Atlas under Developer tools and made by One Systems, Inc.

  • Who is One for?

    developers and teams connecting AI agents to their apps and controlling what each agent may do

  • How much does One cost?

    One has a free plan; paid plans start at $29/mo, per its pricing page on 2026-10-13.

  • Is One free?

    Yes, One has a free plan, per its pricing page on 2026-10-13.

  • Do people use One?

    Little sign of use: ≈ 736 visits/mo · estimate, 2026-10.

  • Is One still maintained?

    Actively maintained: release 2 days ago · site updated 2 days ago.

  • Who owns One?

    One is run by One Systems, Inc., per its privacy policy (2026-10-13).

  • Does One train AI on your data?

    No, per its privacy policy (2026-10-13): “We do not use your content or Customer Data to train AI models.”

  • Is One safe?

    We do not audit vendors. What One publishes, read 2026-10-13: SOC 2 Type II, GDPR stated on its security page; on training with your data, “We do not use your content or Customer Data to train AI models.”.

  • Does One give refunds?

    In its own words (terms of service, 2026-10-13): “All fees are non-refundable except as required by law.”

  • What are alternatives to One?

    In Developer tools, by use: Merge, CROO, Opper AI, Jentic, Agentfield, Aident AI Beta 2.

Not quite it? Describe the job

beta

Five tools from the Atlas that fit it, each judged against what you wrote.

How we read a tool

No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.

  • Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
  • Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
  • Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
  • The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.

How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.