Can I open-source Inbox Zero?
KINDA · partial or early alternativesKinda. Stalwart and Listmonk cover the core of Inbox Zero, but they're early or partial — expect gaps like Outlook and reliable multi-account support and battle-tested token refresh, push sync, retries, rate-limit handling, and background uptime.
They pay for the two-click setup and the confidence that a security-sensitive inbox integration will stay synced, recover from provider failures, and keep its integrations working. People who prefer to own the infrastructure can self-host the official open-source product instead of maintaining a smaller rewrite.
xOutlook and reliable multi-account support
xbattle-tested token refresh, push sync, retries, rate-limit handling, and background uptime
xreply-in-your-voice learning with deeper mailbox, calendar, and knowledge-base context
xSlack and Telegram chat, mobile access, meeting briefs, and attachment filing
xhosted security, compliance, team administration, monitoring, and support
These projects already replace it, free.
LListmonkHigh-performance single-binary newsletter and mailing list manager with campaigns, templates, and Postgres backendopen source↗SStalwartModern all-in-one mail server in Rust with JMAP, IMAP, and SMTP plus built-in spam filtering.open source↗What each one is, in full: Listmonk · Stalwart
no votes, no pay-to-list · just what's real
Inbox Zero pricing
| plan | monthly | annual (per mo) | what you get |
|---|---|---|---|
| starter | $20/user | — | 1 paid user seat; limited knowledge base; no published email-volume or AI-action quota. |
| plus | $35/user | — | 2 email accounts included per user; unlimited knowledge base; no published email-volume or AI-action quota. |
| professional | $50/user | — | At least the 2 accounts/user included in Plus; team-wide analytics; no published email-volume or AI-action quota. |
| enterprise | custom | — | Custom plan for SSO, SCIM, on-premise deployment and dedicated account management; numeric caps not published. |
free tierno permanent hosted free tier; 7-day trial on hosted plans; the open-source edition can be self-hosted with Docker and Node.js 24+ but requires your own infrastructure and AI provider
billingmonthly + annual (vendor says annual saves up to 20%, but exact annual plan amounts were not exposed); changes are prorated; cancel anytime; 14-day refund window
hidden costsSelf-hosting avoids the hosted subscription but shifts cost to your own server, database/queue services and LLM usage. Hosted tiers publish no email-volume or AI-usage allowances, so potential usage limits or extra-account pricing could not be verified.
verified 2026-08-12 · source ↗
Can I open-source Inbox Zero?
Kinda. Listmonk covers the core of Inbox Zero, but there are real gaps: Outlook and reliable multi-account support, battle-tested token refresh, push sync, retries, rate-limit handling, and background uptime. Read the honest list above before committing.
How much does Inbox Zero cost?
Inbox Zero costs about $20/month (Starter, checked 2026-07-30), which is $240 per year.
What do I lose by replacing Inbox Zero?
Honestly: Outlook and reliable multi-account support; battle-tested token refresh, push sync, retries, rate-limit handling, and background uptime; reply-in-your-voice learning with deeper mailbox, calendar, and knowledge-base context; Slack and Telegram chat, mobile access, meeting briefs, and attachment filing; hosted security, compliance, team administration, monitoring, and support. If any of those are load-bearing for you, keep paying.
Is there an open-source alternative to Inbox Zero?
Yes: Listmonk (High-performance single-binary newsletter and mailing list manager with campaigns, templates, and Postgres backend) Stalwart (Modern all-in-one mail server in Rust with JMAP, IMAP, and SMTP plus built-in spam filtering.)