Ugly Email vs PixelBlock vs Trocker (2026 Compared)

Every email tracker blocker is trying to solve the same problem: a hidden one pixel image that tells the sender the instant you open their message. Where they differ is how aggressively they block, how clearly they tell you what they caught, whether they also handle tracked links, and, crucially, how well they keep up as new trackers appear. A blocker that was great in 2019 is not automatically great in 2026, so it is worth comparing them on current behavior rather than reputation.

Key Takeaways

• Ugly Email, PixelBlock, and Trocker are all free Gmail extensions that block email tracking pixels, but they differ in detection, link handling, and how actively they are maintained.
• Ugly Email flags tracked emails with an eye icon before you open them, which is useful, but its detection list depends on regular updates to stay current.
• PixelBlock blocks pixels and reports blocked attempts, but its maintenance has been inconsistent, so coverage of newer trackers can lag.
• Trocker goes further than most by marking both tracking pixels and tracked links, and it works beyond Gmail.
• Gblock is built for Gmail with an auto updating blocklist and tracking link handling, so it keeps blocking new trackers without you reinstalling or maintaining anything.

What Does an Email Tracker Blocker Do?

An email tracker blocker stops the invisible tracking pixel in an email from loading, so the sender never learns that you opened it. Most also try to identify which tool placed the pixel and show you a small indicator. The better ones extend the same idea to tracked links, which route your clicks through a logging server before sending you to the real destination. The whole job rests on one thing: an accurate, current list of the domains and patterns trackers use. When that list goes stale, the blocker quietly stops catching new trackers, which is the single most important difference between these tools.

Ugly Email: What It Does Well and Where It Falls Short

Ugly Email is one of the original Gmail tracker blockers and is still popular for good reason. Its signature feature is the eye icon it places next to a message in your inbox list when it detects a tracker, so you know an email is watched before you even open it. It is free, lightweight, and focused on Gmail.

The trade off is coverage. Like any blocklist based tool, Ugly Email only catches the trackers it knows about, so its effectiveness depends on how current its detection signatures are. If a sender uses a newer or self hosted pixel that is not on the list, it can slip through. For most mainstream tools it does the job, but it is not a guarantee against everything.

PixelBlock: What It Does Well and Where It Falls Short

PixelBlock takes the blocking first approach. Rather than just flagging, it stops tracking pixels from loading and shows a red eye icon to tell you an attempt was blocked. When it works, it is simple and satisfying, and it has long been a community favorite for Gmail.

The honest concern in 2026 is maintenance. PixelBlock has gone through stretches of inconsistent updates, and users have reported periods where coverage of newer trackers lagged. A pixel blocker is only as good as its most recent update, so an extension that is not actively maintained gradually loses ground as trackers change their techniques. If you rely on PixelBlock, it is worth verifying it is still catching current trackers rather than assuming.

Trocker: What It Does Well and Where It Falls Short

Trocker is the most feature rich of the three. It blocks tracking pixels, marks tracked links so you can see when a click would be logged, and gives you details about the tracker it found. It also works beyond Gmail in other webmail and clients, which makes it appealing if you do not live entirely in Gmail.

The cost of that breadth is a slightly busier experience and, again, a dependence on its detection staying current. For a privacy minded user who wants link tracking visibility as well as pixel blocking, Trocker is a strong free option. For more on the broader category, see our roundup of email tracker Chrome extensions and how to block them.

How Does Gblock Compare?

Gblock is built specifically to solve the maintenance problem that quietly undermines blocklist tools. It blocks tracking pixels inside Gmail automatically and updates its blocklist as new trackers appear, so you are not relying on an extension that may have stopped being maintained. It also handles tracking links, not just pixels, and stays inside the Gmail interface you already use rather than asking you to change clients.

The honest framing is this: all four tools block the common trackers from Mailtrack, Streak, Yesware, and HubSpot when their lists are current. The difference shows up at the edges, with newer and self hosted pixels, and over time, as trackers evolve. Gblock's focus is keeping that coverage current automatically. To see how blocking compares with Gmail's own settings, read our guide on how to block email tracking in Gmail.

Which Email Tracker Blocker Should You Choose?

If you want a visible warning before opening, Ugly Email is appealing. If you want the simplest possible blocker and do not mind checking it is current, PixelBlock is fine. If you want link visibility and use mail outside Gmail, Trocker is strong. If you want something that stays current on its own inside Gmail, that is what Gblock is built for.

The Bottom Line

There is no bad choice here. Any of these is far better than letting every sender see when you read their email. The real differentiator over time is maintenance, because a tracker blocker that stops updating slowly stops working. Pick the one whose trade offs match how you use email, and if you want the lowest effort option for Gmail specifically, Gblock keeps its blocklist current automatically so you never have to think about it. If you are also weighing the most installed tracker itself, our breakdown of whether Mailtrack is safe is a useful companion.