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A screenshot of Allo, showing the "smart reply" feature
||September 21, 2016
|"Stable release(s) [±]
||26.0.058_RC05 / January 19, 2018
||26.0 / January 23, 2018
||"English, "French, "German, "Hindi, "Indonesian, "Italian, "Japanese, "Korean, "Portuguese, "Spanish
Google Allo is an "instant messaging "mobile app by "Google for the "Android and "iOS "mobile operating systems, with a web client available on "Google Chrome, "Mozilla Firefox, and "Opera.
The app uses phone numbers as identifiers, and allows users to exchange messages, files, voice notes and images. It includes a "virtual assistant, a feature that generates automatic reply suggestions, and an optional "encrypted mode. Users can resize messages and add doodles and stickers on images before sending them.
Before launch, Google touted strong privacy in the app, with particular emphasis on messages stored "transiently and in non-identifiable form". However, at launch, privacy was significantly rolled back, with Google now keeping logs of messages indefinitely (or until the user deletes messages) in an effort to improve the app's "smart reply" feature.
Allo was announced at Google's "developer conference on May 18, 2016. At the time, Google said that it would release Allo in summer 2016. Google launched the app on September 21, 2016. During the unveiling of Google's "Pixel smartphone in October 2016, it announced that Allo will be pre-installed on the Pixel phones, along with its sister app, "Google Duo. In February 2017, a "tweet by Google's Vice President of Communications Nick Fox showed a screenshot of Allo running as a "web app, along with the words: "Still in early development, but coming to a desktop near you..." A further tweet from Fox in May stated that the web client was "a month or two from public release."
In August, Google Allo for web went live for Android users using Google Chrome, while Firefox, Opera and iOS support was rolled out in October.
In April 2018, it was reported that Google would be "pausing" development of Allo. Anil Sabharwal, the new head of the communications group at Google, stated that its employees will work primarily on its implementation of the carrier-based "Rich Communication Services Universal Profile, under the branding "Chat". This will be implemented within the Android Messages app used for SMS.
The Whisper Shout feature being demonstrated at "Google I/O
Allo is based on phone numbers, not by social media or email accounts. Allo's "Smart reply" feature uses Google's "machine learning technology to suggest a reply to the last message, which can be selected from a few options. The feature also analyzes images sent to the user in order to suggest responses. Similar to the smart reply feature seen in Google's "Inbox app, it learns from the user's behaviour to adapt its suggestions over time. Allo is one of the apps that support "Google Assistant, a virtual assistant that allows users to ask questions and receive answers in a two-way conversational nature. Additional features include "Whisper Shout", which allows the user to increase or decrease the size of a message to represent volume, and the ability to draw on photos before sending them.
In November 2016, Google introduced Smart Smiley, a feature that suggests emojis and stickers depending on the mood of the message. Smart Smiley also shows suggestions when starting a new conversation. In addition, background themes for chats were added at the same time.
In March 2017 a GIF library was added in the compose bar, as well as easier one-tap access to the Google Assistant, and animated emoji. Also in March was an update that let Android users send various types of files, including "PDFs, documents, "APKs, "ZIP archives, and "MP3 tracks through Allo. In May, the app was updated to allow users to backup and restore chats, added an Incognito mode for group chats, and introduced previews for links. Later the same month, "Fast Company reported that Google updated Allo to add cartoon stickers on selfie photos, powered by "artificial intelligence technology capable of producing "563 quadrillion face" animations. Complementing selfie stickers, Google also launched "selfie clips", short looped videos of the user's face. In June, the ability to make Google Duo video or audio calls directly from Allo chats was included. The following month saw message reactions being added, where users can tap on a heart below messages received. An in-chat translation feature appeared to some users in version 17 and rolled out to all in version 18, the latter of which was released in September. Group chat controls, which can be switched on for new group chats, were added in November 2017. In version 25, automatic transcriptions for audio messages appeared, though this can be disabled in settings.
Incognito mode is an optional mode that includes expiring chats, private notifications, and "end-to-end encryption. For encryption, the app uses the "Signal Protocol. Incognito mode does not include any Smart Reply or Google Assistant features. When the user receives a sticker from a sticker pack that they do not already have installed on their device, the app will retrieve the sticker from Google’s servers using security, but not end-to-end encryption.
"PC World's Mark Hachman gave a favorable review of Allo's virtual assistant, saying that it was a "step up on "Cortana and "Siri".
Following Allo's introduction at Google I/O, Google was criticized by security experts and privacy advocates for having the end-to-end encryption turned off by default, which they argue leaves the app open to "government surveillance. "Edward Snowden, whistleblower and former "NSA contractor, criticized the app on "Twitter, saying that "Google's decision to disable end-to-end encryption by default in its new #Allo chat app is dangerous, and makes it unsafe."
Thai Duong, a co-lead of Google's product security team, wrote in a personal blog post that he would push for the addition of a setting that would let users have the encryption on all the time. However, he later retracted the statement.
When Allo was first introduced, its developers talked about storing non-incognito messages only "transiently and in non-identifiable form". At launch, Google revealed that they would instead store all non-incognito messages indefinitely (or until the user deleted them) in order to improve the built in "smart reply" feature. Russell Brandom of "The Verge commented that "the decision will have significant consequences for law enforcement access to Allo messages. By default, Allo messages will now be accessible to lawful warrant requests, the same as message data in "Gmail and "Hangouts".
Other privacy issues
Reports surfaced in March 2017 that a bug with the Google Assistant in the Allo app would accidentally share results in a conversation from an individual's search history, despite the search not being previously mentioned by the other chat participant or previously in the conversation. Google acknowledged the issue, and stated that it had been fixed.
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