Inbox by Gmail
Product brand
UnclaimedInbox by Gmail was Google's experimental email service focused on automated organization, reminders, and productivity-oriented message management.
Last updated August 25, 2026
Overview
Inbox by Gmail was an email service developed by Google as an alternative interface and workflow for Gmail. It was announced on October 22, 2014, initially through a limited invitation-only release, and became publicly available on May 28, 2015. The service was accessible through a web application and dedicated Android and iOS applications. The product was designed around the idea that conventional inboxes forced users to process messages one by one, even when many messages belonged to the same task or subject. Inbox therefore emphasized automated organization and surfaced information rather than presenting email as a simple chronological list. Its Bundles feature grouped related messages into categories such as travel, purchases, or newsletters. Users could also create and train bundles manually, allowing the system to learn how they preferred to organize incoming mail. Inbox also extracted useful information from messages and displayed it prominently. Flight itineraries, hotel reservations, event details, photographs, documents, package-delivery updates, and other important content could be highlighted without requiring the user to open every message. The service combined these capabilities with reminders and snoozing. A message or reminder could be temporarily removed from view and scheduled to return at a later time or, in some cases, at a specified location. This made Inbox a hybrid of email client, task manager, and personal information dashboard. Google progressively added features that later became influential in mainstream email software. Undo Send was introduced in June 2015, giving users a short period in which to cancel a message. Smart Reply arrived in the mobile applications in November 2015 and later reached the web. It generated several short suggested responses for eligible messages, allowing users to answer with a single tap. Google reported that Smart Reply accounted for 10 percent of mobile replies from Inbox in March 2016 and approximately 12 percent by May 2017. Later updates added Google Calendar event organization, newsletter previews, a Save to Inbox tool for storing links, and an unsubscribe card for mailing lists. Reviews were broadly favorable, especially regarding the product's visual design, speed, and ability to make important information easier to find. Critics nevertheless identified trade-offs. The interface displayed fewer messages at once than traditional email clients, which could be inconvenient for people processing large volumes of mail. Some reviewers also felt that the automated organization required further refinement and that users who already had carefully developed filing systems might feel they were surrendering too much control to Google's algorithms. Google announced in March 2019 that it would discontinue Inbox. The service closed on April 2, 2019. Google described Inbox as a place where it had tested new ideas and said that many of its concepts had been incorporated into Gmail. Snoozing, nudges, hover actions, and Smart Reply subsequently became available in Gmail, although some Inbox capabilities, particularly its distinctive Bundles experience, were not immediately reproduced in full. The product's legacy continued through third-party email applications and browser projects that sought to recreate parts of its workflow and visual design.
History
Inbox by Gmail emerged from Google's effort to rethink email around the information and tasks contained in messages rather than around a purely chronological mailbox. Google announced the service on October 22, 2014, initially limiting access to invited users. The product was built as a separate experience for Gmail accounts and was delivered through the web, Android, and iOS. Its central design principle was automated organization. Inbox scanned incoming Gmail messages, identified relationships among them, and placed related items into Bundles. Travel-related messages, for example, could be presented together so that reservations, tickets, and related documents could be reviewed as one topic. Users could create or adjust groupings, but the overall experience encouraged them to rely on the system's classification rather than maintain a traditional hierarchy of folders and labels. The service also attempted to turn email into a more active personal assistant. Highlights extracted information such as itineraries, event details, photographs, documents, and delivery updates. Reminders allowed users to associate actionable tasks with their inbox, while Snooze temporarily hid messages and returned them at a chosen time or location. These features aimed to reduce the need for users to remember which messages required follow-up. Inbox became publicly available on May 28, 2015. Google continued to develop it with a series of feature releases. Undo Send, added in June 2015, provided a short cancellation period after a message was sent. Smart Reply was introduced to the mobile applications in November 2015. It analyzed eligible messages and offered three brief suggested responses. The feature was added to the website in March 2016. Google said that 10 percent of mobile replies were already being generated through Smart Reply in March 2016, and later reported a figure of about 12 percent in May 2017. Further additions in April 2016 included Google Calendar event organization, newsletter previews, and Save to Inbox, which enabled users to retain links for later use without sending those links to themselves by email. In December 2017, Inbox added an unsubscribe card for mailing lists whose messages had gone unopened for an extended period. Reception reflected the product's experimental character. Reviewers frequently praised its speed, visual polish, and ability to expose useful information without requiring every message to be opened. At the same time, the interface's low information density made it less convenient for people handling hundreds of messages. Its automated Bundles could also require adjustment, and users with established manual systems sometimes found the service's approach restrictive. Inbox thus appealed most strongly to people willing to let software organize their mail and less strongly to users who wanted direct control over every classification. Google ultimately decided not to maintain two distinct email experiences. In March 2019, it announced that Inbox would be retired and that many of its ideas had been transferred to Gmail. The service ended on April 2, 2019. Gmail subsequently incorporated functions including snoozing, nudges, hover actions, and Smart Reply, although the complete Inbox workflow was not immediately reproduced. Third-party applications and browser projects later attempted to preserve elements of Inbox's bundling, prioritization, and streamlined interface, reinforcing its influence despite its relatively short operating life.
- 2019
Service discontinued
[1]Google announced the retirement of Inbox in March, and the service shut down on April 2 as the company consolidated email development in Gmail.
- 2017
Unsubscribe card introduced
[1]Inbox began surfacing an unsubscribe option for certain mailing-list messages that users had not opened for an extended period.
- 2016
Smart Reply reaches the web
[1]Google expanded Smart Reply to Inbox's web interface and disclosed early usage figures for the feature.
- 2016
Productivity integrations added
[1]Inbox added Calendar event organization, newsletter previews, and Save to Inbox for retaining links.
- 2015
Public launch
[1]Inbox became publicly available on May 28, expanding access beyond the initial invitation program.
- 2015
Undo Send added
[1]Inbox introduced a short post-send cancellation window, allowing users to retract an email shortly after sending it.
- 2015
Smart Reply introduced on mobile
[1]The mobile applications began offering automatically generated short replies for selected emails.
- 2014
Invitation-only announcement
[1]Google announced Inbox by Gmail and began a limited invitation-based release for its web, Android, and iOS experiences.
Products and positioning
Inbox by Gmail was positioned as a smarter, more proactive alternative to conventional email interfaces. Rather than requiring users to sort and process every message manually, it emphasized automatic grouping, extracted information, reminders, and timely resurfacing of messages. Its design targeted users seeking a cleaner and more task-oriented way to manage email, while accepting greater reliance on Google's organizational algorithms.
Email service · 2014
Inbox by Gmail
The core Inbox service was a Gmail-connected email experience available on the web and through Android and iOS applications. It organized messages into Bundles, extracted important details into Highlights, supported reminders and Snooze, and offered productivity functions such as Smart Reply, Undo Send, Calendar integration, newsletter previews, and link saving. Google discontinued the service in 2019.
Email organization feature · 2014
Bundles
Bundles grouped messages that appeared to concern the same broad subject or workflow. Examples included travel, purchases, and newsletters. Users could also create or modify groupings, allowing the system to adapt to personal email habits while retaining an automated organization model.
Assisted writing feature · 2015
Smart Reply
Smart Reply analyzed selected incoming messages and proposed several short responses. A user could choose a suggested answer with a tap rather than compose a reply manually. It first appeared in Inbox's mobile applications and later expanded to the web before becoming part of Gmail.
Brand decisions
2019
Consolidation of Inbox development into GmailStrategyBackground
Google operated Inbox as an experimental product alongside Gmail, using it to test alternative approaches to email organization and productivity.
Action taken
Google announced that Inbox would be discontinued and that email development would focus on Gmail, with selected Inbox concepts transferred to the main service.
Aftermath
Inbox closed on April 2, 2019. Gmail adopted features including Snooze, nudges, hover actions, and Smart Reply, while third-party products and community projects attempted to preserve other elements of the Inbox experience.
Recent events
- 2019
Google announces the discontinuation of Inbox by Gmail[1]
Other
Google announced that it would end Inbox and concentrate its email development on Gmail, citing the migration of many experimental features into the main Gmail product.
- 2019
Inbox by Gmail shuts down[1]
Other
Inbox ceased operating on April 2, 2019. Users were directed toward Gmail, where Google had incorporated selected Inbox concepts.
- 2016
Smart Reply expands to the Inbox web interface[1]
Product generation
Google extended Smart Reply from Inbox's mobile applications to its web experience and reported substantial use of the feature on mobile.
- 2016
Inbox adds Calendar organization, newsletter previews, and Save to Inbox[1]
Product launch
An update connected Inbox more closely with Google Calendar, provided previews for newsletters, and allowed users to save web links for later access.
- 2015
Inbox by Gmail becomes publicly available[1]
Product launch
Google ended the initial invitation-only phase and released Inbox publicly on the web and through Android and iOS applications.
- 2015
Inbox adds Undo Send[1]
Product generation
Google added an Undo Send control that gave users approximately ten seconds to cancel a sent email.
- 2015
Inbox introduces Smart Reply on mobile[1]
Product launch
Smart Reply began generating several short suggested responses for selected messages in the Android and iOS applications.
- 2014
Google introduces Inbox by Gmail through an invitation-only release[1]
Product launch
Google announced Inbox as a new email service and began distributing access through invitations. The product introduced automated Bundles, message Highlights, reminders, and snoozing as alternatives to conventional inbox management.
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