engo on TF1 : Inside our technology

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This Sunday morning, TF1 came to meet us in Grenoble to discover behind the scenes at engo and explore our smart eyewear technology designed for athletes.
As part of a report dedicated to French innovation, the TF1 team followed our glasses in action and took a closer look at how they are developed at our Grenoble facilities.

Run without taking your eyes off your data
The report begins out in the field, during a running session.
Through our glasses, Jean-Christophe can see his speed, heart rate, and running time, thanks to data transmitted from his watch.
“Everything you see on the watch is displayed on my glasses.”
Normally, checking this information means raising your wrist and looking at your watch. With engo, the data is directly accessible in your field of view.
As Jean-Christophe points out during his test, knowing exactly what pace you are running at can also be a great source of motivation.
Technology developed in Grenoble
The report then heads to our facilities in the heart of Grenoble, where our technology comes to life.
TF1 meets one of our designers, who also uses the glasses during his own training sessions. After getting back into sport a year and a half ago, he has notably seen an improvement in his heart rate.
At engo, sport is therefore an integral part of both the development and use of our products.
37 Grams vs. 67 : When weight makes a difference
To better understand our approach, TF1 focused on one essential factor : weight.
The report compares a pair of American smart glasses weighing 67 grams with our 37-gram glasses a difference of 30 grams.
Whether running or cycling, a few extra grams can quickly become noticeable. As explained in the report, above 40 grams, glasses can become too heavy for certain sports.
This reduced weight is also the result of a deliberate choice: our glasses are not designed to film. We chose to focus on what matters to athletes : displaying performance data in real time while keeping the glasses lightweight.
The report also highlights their price, at around €350 on average, positioning them below some of the competing smart glasses featured.

Behind the scenes of our glasses
TF1 also stepped inside our production area.
In a dust-controlled room designed to protect the optical components, an essential part of our glasses is assembled with precision.
Our lenses come from Italy and our temples from Asia, but our display and projector are designed and assembled here in Grenoble.
This is a source of real pride for our team, as Jérôme explains in the report :
“Long live France ! There’s a certain pride, a certain recognition. We’re just as capable as anyone else.”
Once the hardware is ready, our development teams take over to integrate the applications needed to power our glasses.
From running to cycling… and even sailing
Our technology isn’t limited to running.
In the report, Eric also presents a mask designed for sailing, allowing sailors to access their performance data in real time aboard racing boats.
Running, cycling, sailing: the terrain may change, but our goal remains the same to give athletes access to their data during their activity without taking their attention away from what’s ahead.
Today, we sell around 10,000 glasses per year, with a team of just 25 people.
And we have one ambition : to continue developing this technology and help even more athletes around the world, whatever their sport or terrain.
Thank you to TF1 for coming to Grenoble to meet our teams and discover what goes on behind the scenes at engo.
Discover engo3




Everything runners ask, answered.
Will I even notice a difference?
The engo3 uses fixed tinted lenses (category 3), perfect for very sunny conditions. The engo3 Photochromic features photochromic lenses that automatically adapt to light levels (cat. 0 to 3), making it ideal for changing light conditions.
Is engo3 compatible with Garmin?
Yes it is, with over 81+ models of Garmin devices, plus Apple Watch.
How is engo3 different from Meta Oakley Vanguard?
engo3 is a pure performance display built for serious runners and cyclists: a lightweight AR heads-up display (38.5g) that projects your stats (pace, heart rate, cadence, and more) right in your line of sight, with 20+ hours of battery life and no camera, music, or notifications to distract you.
The Oakley Meta Vanguard is a general-purpose smart glasses product with a built-in camera and Meta AI, giving you sport stats through voice commands or audio rather than a visual display, with about 9 hours of battery life. In short: engo3 keeps your eyes on the road and your data always visible, Vanguard is a multitasking device where sport is one feature among many.
How long does the engo3 battery last?
24+hours
Can I use engo3 for trail running or ultras?
Yes!
Does engo3 have a camera?
No, engo3 doesn't have a camera. It's built purely as a data display: no camera, no music, no notifications, just your real-time stats (pace, heart rate, cadence, etc.) projected in your field of view. That's a deliberate choice to keep it light (38.5g) and focused on performance rather than content capture.
What is the weight of engo3?
38.5 gr
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