Why read time stops at the Gmail inbox

For most people you email from Gmail, no tracker can tell you how long they spent reading. Read time is a real metric, and some tools report it, but it depends on the reader's email app reporting back again and again while the message stays on screen. Gmail does not, and neither do several of the apps your prospects most likely use. What you can measure is whether the email was opened, whether a link was clicked, whether they replied, and, if the important part travels as a document link, how long they spent on each page of it.

How tools measure read time

The platforms that offer it sort opens into three groups. Litmus, whose engagement metrics page now lives in Validity's help center, counts 8 seconds or more as Read, 2 to under 8 seconds as Skimmed, and under 2 seconds as Glanced. Its exports report read time in steps of 2 seconds, and it does not track read time beyond 20 seconds. HubSpot's campaign performance guide draws the same lines at 8 and 2 seconds.

ContactMonkey, which tracks internal company email, is the most open about the mechanics. Its read time article says the tracking pixel loads when the email is opened and then refreshes every 3 seconds. When the reader moves to another email or closes the app, the timer stops and the total goes into a group. Its lines sit a little differently: 1 to 3 seconds is Glanced, 3 to 9 is Skimmed, 9 and over is Read.

Where the clock never starts

HubSpot says it in one sentence: some clients, such as Gmail, do not provide this data. ContactMonkey is more specific. Its article is titled Outlook only, and it lists the apps where read time works: classic Outlook, Outlook for Mac and Outlook on iOS. It does not work in Gmail or Apple Mail. It is unreliable in the new Outlook and Outlook on the web, because those apps cache email opens. And when Microsoft's image proxy is turned on, the proxy blocks the repeated refresh the timer depends on.

Google's help page on turning images on or off in Gmail explains the Gmail side. Google scans images before the reader receives them, and it says senders cannot use image loading to learn about the reader's computer or location. Our reading is that once Google fetches the image on the reader's behalf, nothing on your server stays connected to the reader's screen, so there is no stream of refreshes to count. Both vendors' support lists fit that explanation.

If a tool shows seconds of reading for a Gmail recipient, ask where those seconds came from.

What the numbers mean when you do get them

Even in Outlook, read time is coarse. Litmus stops counting at 20 seconds, so a two minute read and a 21 second read look the same. The lines move between vendors, so 8 seconds is Read in HubSpot and Skimmed in ContactMonkey. And Litmus describes the figure as how long the recipient had the email open, which is a different thing from reading. A message left open during a phone call looks like a careful read.

There is a second limit that matters more for sales. ContactMonkey states that its read times are aggregate totals, not unique per recipient or device. That makes them useful for judging a newsletter, and of little use for judging what one prospect did with one proposal.

Signals that answer the question instead

• A reply. It is the only signal that proves someone read closely enough to respond, and it costs them effort, so it means more than any timer.
• A click on something specific. Someone chose to act, and the link tells you which part of the email mattered to them.
• Time on a shared document. If the proposal, pricing or contract is the part that has to be read, send it as a link to a viewer rather than as an attachment. The viewer runs in the reader's browser, so it can count time page by page in a way an email body cannot.
• An open, read for what it is. It says the message was displayed. Use it to time your next follow-up, and leave judging interest to the signals above.

What Fast Mail Tracker shows

Fast Mail Tracker does not claim read time for the email body, for the reasons above. Each open is listed with its time, and on group emails with the recipient it belongs to when we can tell, while opens from bots and security scanners are flagged rather than counted as reads. For the part that must be read, share the PDF as a tracked link. Our viewer renders the document in the reader's browser and adds time only to the pages on screen while the tab is visible, reporting every five seconds. You see seconds read and pages reached for each viewing session, an average time per view, and a chart of time on every page. Sessions we flag as scanners stay in the record but never add reading time.

Fast Mail Tracker is in early access while Google's security review completes, so places are limited; if you want to know which page of your proposal held attention, the install button below is the place to start.