Inbox Zero vs Jace AI
We give Inbox Zero and Jace AI the same GPA: 2.8 out of 4.0. Inbox Zero grades higher on platforms. Jace AI grades higher on the free plan. They get the same grade on value for money, features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Inbox Zero
Open source AI email assistant for Gmail and Outlook
Jace AI
AI email agent with a web inbox for Gmail and Outlook
How we grade them
| 2.8GPAInbox ZeroGood | 2.8GPAJace AIGood | |
|---|---|---|
| Value for money | CStarter is $18 a user a month billed annually, or $20 monthly, double the $9 that's typical for email tools here. It does cover the sorting, the drafting, the cold email blocker and bulk unsubscribe. The meeting notetaker, Slack and app integrations and a second email account start on Plus at $28. | CPlus is $20 a month billed yearly, or $25 monthly, more than double the $9 that's typical for email tools here. That buys 10,000 credits a month, up to 2 inboxes and chat over 1 year of email history. Custom integrations and MCPs are listed under Pro, which is $40. |
| Free plan and trial | DNo free plan on the hosted service. Every plan starts with a 7-day trial, and it needs a credit card. Refunds are offered within 14 days of upgrading. The Inbox Zero Tabs browser extension is free, and the code is open source if you'd rather host it yourself. | CNo free plan. Plus and Pro both start with a 7-day free trial you can cancel any time, though our listing doesn't say whether it asks for a card. The site also states a 30-day money-back guarantee. |
| Features | AMail sorted into categories like To Reply, Newsletter and Cold Email, by rules you describe in plain English. Replies drafted in your tone, one-click unsubscribe from senders you never read, and email analytics. There's even an optional keyboard-first email client with a split inbox. That's the whole job. | AComplete reply drafts in your style, labels like Needs Reply and Waiting applied for you, and rules written as short plain-language instructions. AI Flows watch for matching emails, then create calendar events or update Notion, Slack and HubSpot. You can chat with your inbox, too. That's the whole job. |
| Ease of use | BNo rating on record, so a B is our ceiling. It works in the background of Gmail and Outlook, and you tell it how to handle mail in plain English, not in filter menus. The mobile apps do leave some settings to the web app. | BNo rating on record, so a B is our ceiling. It's a web inbox that runs on your Gmail or Outlook account, and its drafts are saved back to Gmail or Outlook. You do have a monthly credit allowance to watch. |
| Platforms and integrations | AWeb, Mac, Windows, iPhone, Android and a browser extension. You can reach the assistant from Slack or Telegram, and it connects to Google Drive, OneDrive, Notion and Stripe. It supports Gmail, Google Workspace and Microsoft Outlook accounts only. | BA web inbox and nothing native. There are no iOS or Android apps yet, and the docs suggest using the Gmail or Outlook mobile app alongside it. It has built-in connections to Slack, Google Drive and OneDrive, and prebuilt MCP servers for Notion, Linear, GitHub and Salesforce. |
| Best for | an open-source AI assistant for your inbox | email that sets off actions in your other tools |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Inbox Zero and Jace AI. How we grade
Where they differ
- Inbox Zero starts at $18 per user / month, billed annually ($20 billed monthly). Jace AI starts at $20 per month, billed yearly ($25 billed monthly).
- Only Inbox Zero lists macOS, Windows, iOS and Android apps.
- Only Inbox Zero lists a browser extension.
- Inbox Zero is open source and self-hostable, according to its own site.
- Jace AI also covers AI agents.
At a glance
| Inbox Zero | Jace AI | |
|---|---|---|
| Pricing | Free trial | Free trial |
| Starts at | $18 per user / month, billed annually ($20 billed monthly) | $20 per month, billed yearly ($25 billed monthly) |
| Free plan | None | None |
| Free trial | 7-day free trial on every plan; a credit card is required. Refunds are offered within 14 days of upgrading. | 7-day free trial on Plus and Pro, cancel anytime. The site also states a 30-day money-back guarantee. |
| Web | ||
| macOS | ||
| Windows | ||
| iOS | ||
| Android | ||
| Browser extension | ||
| Made by | Inbox Zero Inc. | Zeta AI, Inc. |
| Price read from | getinboxzero.com | jace.ai |
| Checked | Oct 9, 2026 | Oct 9, 2026 |
Who each one suits
Inbox Zero
- Gmail and Outlook users who want mail sorted and replies drafted for them
- Teams that prefer open source software they can inspect or self-host
- Clearing newsletters and cold outreach out of a crowded inbox
Jace AI
- Professionals handling a high volume of email in Gmail or Outlook
- Teams that want incoming email to trigger actions in Slack, Notion or HubSpot
- People managing several inboxes: Pro connects up to 8 accounts
Worth knowing
Inbox Zero
- There is no free plan for the hosted service: every plan starts with a 7-day trial that needs a credit card.
- It supports Gmail, Google Workspace and Microsoft Outlook accounts only.
- The AI meeting notetaker, Slack and app integrations, email digests and auto-filed attachments start at Plus.
- The free Inbox Zero Tabs browser extension works with Gmail only, and the mobile apps leave some settings to the web app.
Jace AI
- There are no native iOS or Android apps yet; the docs suggest using the Gmail or Outlook mobile app alongside the web inbox.
- There is no free plan: Plus and Pro start with a 7-day free trial.
- Usage is metered in monthly credits: 10,000 on Plus and 20,000 on Pro, with higher Pro tiers at prices the page does not list.
- Plus is limited to 2 inboxes and 1 year of email history; custom integrations and MCPs are listed under Pro.
Key features
Inbox Zero
- AI labels and plain-English rules
- Incoming mail is sorted into categories such as To Reply, Newsletter, Marketing and Cold Email. You can add categories of your own and describe in plain English how the assistant should handle mail.
- Pre-drafted replies
- Emails that need a response get a draft written in your tone, based on your email history and calendar, waiting in the inbox for you to review and send.
- Bulk unsubscribe and archive
- Shows which senders you never read so you can unsubscribe from and archive them in one click. A cold email blocker and email analytics are part of every plan.
- Optional email client
- A keyboard-first client for Gmail and Outlook on web, desktop and iPhone, with a split inbox, a command palette, several accounts in one inbox and team comments that are never sent as email.
- Chat from Slack and Telegram
- The assistant can be reached from Slack or Telegram to read mail, draft replies and manage the inbox. The pricing page lists the Slack integration from the Plus plan.
- Open source and self-hosting
- The code is public on GitHub, with the web and desktop email client under the AGPL license. The docs cover self-hosting with Docker, on Vercel, AWS or Kubernetes.
Jace AI
- AI email drafts
- Writes complete reply drafts in your style, using your signature and context from attachments, calendar and Slack. Drafts are saved to Gmail or Outlook, and follow-up drafts can be prepared after a delay.
- AI labels
- Built-in labels such as Needs Reply, Waiting, FYI, To Do and Promotion are applied automatically, and you can describe labels of your own for the AI to apply to matching mail.
- Rules
- Short plain-language instructions, such as which scheduling tool to use or who to CC, that Jace applies when it drafts and acts. Team owners can share a rule with the whole workspace.
- AI Flows
- A workflow watches for emails that match a description and then drafts replies, creates calendar events, searches the web or updates connected tools such as Notion, Slack and HubSpot.
- Chat with your inbox
- A chat assistant answers questions from your email history, 1 year on Plus and 3 years on Pro, and can fetch data, create documents and carry out tasks.
- Integrations and MCP servers
- Built-in connections to Slack, Google Drive and OneDrive, prebuilt MCP servers for tools such as Notion, Linear, GitHub and Salesforce, and support for most remote MCP servers.
Plans
Inbox Zero
Starter$18
per user / month, billed annually; $20 billed monthly
Sorts and labels every email, drafts replies in your voice, blocks cold emails, bulk unsubscribe and archive, email analytics and pre-meeting briefings.
Plus$28
per user / month, billed annually; $35 billed monthly
Adds 2 email accounts per user, the AI meeting notetaker, Slack and app integrations, email digests, auto-filed attachments and an unlimited knowledge base.
Professional$42
per user / month, billed annually; $50 billed monthly
Everything in Plus, plus team-wide analytics, priority support and a dedicated onboarding manager.
EnterpriseCustom
SSO, SCIM, on-premise deployment and a dedicated account manager, arranged with the sales team.
Jace AI
Plus Plan$20
per month, billed yearly; $25 billed monthly
10,000 credits a month, up to 2 inboxes with unlimited calendars, chat with 1 year of email history, automatic drafts and labels.
Pro Plan$40
per month, billed yearly; $50 billed monthly
20,000 credits a month, up to 8 inboxes, chat with 3 years of history, priority support, custom integrations and MCPs. Higher credit tiers cost more.
Enterprise PlanCustom
For bigger teams: white-glove setup, usage-based pricing and a dedicated account manager, arranged with sales.
Ways to pay less
Inbox Zero
- Annual discount
Save up to 20% with annual billing
Annual billing lowers Starter from $20 to $18, Plus from $35 to $28 and Professional from $50 to $42 per user a month. The pricing FAQ puts the saving at up to 20%.
- Education
Student discount on request
The pricing FAQ says students can email the company to have a discounted plan set up. The size of the discount is not published.
- Nonprofit
Nonprofit and open-source project discounts
The same FAQ answer covers nonprofits and open-source projects, which can email for a discounted plan. No rate is published.
Jace AI
- Annual discount
20% off with yearly billing
Billed yearly, Plus is $20 a month instead of $25 and Pro is $40 instead of $50. The pricing page labels this as 20% off and as saving $60 a year on Plus.
