Arc0 vs StackOne.
Considering Arc0 as a StackOne alternative? A like-for-like read on pricing, consent screens and data handling, including where StackOne's deeper HR, ATS and LMS catalog and existing SSO/SCIM still make it the better choice.
Arc0 and StackOne, line by line.
| Item | ARC0 | STACKONE |
|---|---|---|
| Pricing unit | Per active end user per month, with call credits pooled across the workspace | Per internal seat plus a monthly usage-credit pool on Gateway; OEM plans charge no fee per end customer but still meter usage credits |
| Entry pricing | Free Build tier up to 100 active users in production; Launch is $99/mo including 1,000 active users | Free Gateway Starter and OEM Core tiers; first paid tier is Gateway Team at $600/mo for 5,000 credits per seat |
| Your users' consent screen | Carries the customer's logo on every plan, including free; on paid plans runs on the customer's own domain with the customer's own OAuth apps | The embeddable Hub takes on the host app's styling on every plan; removing StackOne's own branding from the hosted Auth Link is a paid OEM Enterprise add-on |
| Catalog | 1,500+ apps; vendors' official MCP servers can sit behind Arc0 auth | 530+ connectors and 33,000+ actions, concentrated in HR, ATS, LMS and CRM plus sales, marketing, IT and collaboration |
| Audit log | Every call logged on every plan including free; retention is 7/30/90 days by plan, with OpenTelemetry export on paid plans | Retention scales from 1 day on the free tier to 90 days on OEM Enterprise; SIEM export is limited to Enterprise-tier plans |
| Deployment / self-host | EU hosting and dedicated hosting are available on the Scale plan | Standard US/EU processing regions by default; any AWS/GCP region and on-premise/VPC deployment are custom-priced Enterprise-tier add-ons |
| Focus / ownership | Independent, focused only on agent connectivity; operated by Exa Labs LLC | Started as a unified API for SaaS data before adding MCP and agent actions; raised a $20M Series A led by GV, with Workday Ventures among the investors |
Where StackOne is the better choice.
SAML SSO ships on the Gateway Team plan and SCIM ships on OEM Enterprise, while Arc0 lists SSO/SCIM as a roadmap item.
530+ connectors and 33,000+ actions concentrated in HR, ATS, LMS and CRM, with a published per-connector action count for each integration.
Supports MCP and an agent-to-agent protocol alongside a plain REST/SDK unified API, so teams not yet building agents can use the same connectors.
What Arc0 does differently.
Arc0 charges per active end user with pooled call credits. StackOne's Gateway plans charge per internal seat plus a usage-credit pool; OEM plans drop the per-end-customer fee but still meter usage credits.
Arc0 Connect carries the customer's logo on every plan, including free. StackOne's hosted Auth Link keeps StackOne's own branding by default; removing it is a paid OEM Enterprise add-on.
Arc0 logs every call on every plan including free, with 7-day retention on its Personal tier. StackOne's free Gateway Starter tier retains action logs for 1 day, versus up to 90 days on OEM Enterprise.
StackOne says it stores customer data only if the customer opts in, processing in a chosen region by default. Arc0's vault stores encrypted per-tenant credentials by design, exportable by API at any time.
StackOne began as a unified API for SaaS data before adding MCP and agent actions, and took a $20M Series A led by GV with Workday Ventures participating. Arc0 is built only for agent connectivity.
Arc0 lets a customer export vault tokens by API at any time, and tokens from the customer's own OAuth apps keep working after export. StackOne's public docs do not describe a token export endpoint.
Free migration from StackOne.
An engineer moves you over at no charge, on any plan. You keep shipping while we do the work, and nothing changes for your users until you say so.
- 01We map itEvery app, action and auth config your agent uses in StackOne, matched to Arc0.
- 02We set it upYour OAuth apps registered, Arc0 Connect in your brand, and your first policies written with you.
- 03We move your usersTokens imported wherever StackOne lets you export them, and reconnects staged in-product where it doesn’t.
What moving from StackOne looks like.
Moving from StackOne to Arc0 mainly changes who end users see during authentication and how usage is billed, not the underlying SaaS connections themselves.
Connections
StackOne's public documentation does not describe an API for exporting stored OAuth tokens or connections, so end users reconnect once through Arc0 Connect's branded flow.
Your agent
Agents calling StackOne through MCP, A2A or the AI Action SDK point at StackOne's per-connector actions; moving to Arc0 means repointing agents at the single Arc0 MCP endpoint, SDK or REST proxy, with each end user's consent re-granted through Arc0 Connect.
Questions, answered.
Is Arc0 a good StackOne alternative?
Yes if you want one branded consent screen and per-user pricing across your whole app catalog. If you specifically need deep, high-volume HR, ATS or LMS actions, or SSO/SCIM today, StackOne's specialization and existing identity features may fit better.
Does StackOne support MCP?
Yes. StackOne exposes its connectors as MCP servers, alongside a plain REST/SDK unified API and an agent-to-agent (A2A) protocol.
Is StackOne SOC 2 compliant?
StackOne states SOC 2 Type II, GDPR, HIPAA and CCPA compliance, with the audit report and a HIPAA BAA available on its Enterprise and OEM Enterprise plans. Arc0 also holds SOC 2 Type II, with the report available on request, and signs a DPA.
How does StackOne price its platform?
Gateway plans price by internal seat plus a monthly usage-credit pool, free at the Starter tier and $600/mo for Team; OEM plans embed StackOne in a product with no fee per end customer. Arc0 prices per active end user with pooled call credits.
Moving from StackOne? We’ll move you.
Tell us where your connections live today and what your agent does. An engineer plans and runs the move with you, free, including how to keep reconnects to a minimum.