Smartlet One

One concept. Three different personalities

Wear a Smartwatch with Your Cartier | Smartlet

Brand compatibility guide

Cartier

Wear a smartwatch
with your Cartier

Smartlet One is compatible with Cartier Santos, Tank, and Ballon Bleu references using 18mm to 22mm lug widths, natively supported with no adapter. Installation uses the standard spring-bar system - no modification to the watch, fully reversible in seconds.

Cartier invented the wristwatch and never forgot it. The Santos, the Tank, the Ballon Bleu - each case geometry has a century of recognition behind it. Wearing a Cartier is a choice about aesthetics as much as precision. Smartlet One does not compete with that choice. It attaches via the standard spring-bar mechanism and adds a smartwatch track on the same wrist. The guilloché dial, the blued hands, the signature crown - untouched.

159+References

18mm / 19mm / 20mm / 21mm / 22mm / 23mm / 24mmLug widths

18mm→24mmSmartlet range

BrandCartier

OriginFrance

Founded1847

Lug widths18mm / 19mm / 20mm / 21mm / 22mm / 23mm / 24mm

References159+

How it works

Three steps to both watches on one wrist

Choose your strap

Smartlet One is your new strap. It replaces the original bracelet or strap on your Rolex using the same spring-bar system. Lug widths 20mm / 21mm are all natively supported.

Clip in your watch

Attach the Smartlet strap to your Rolex by fitting the spring bars into the lugs, exactly as with any standard strap change. No tools required. Fully reversible in seconds.

Clip in your smartwatch

Slide your smartwatch into the Smartlet module. It locks onto the strap module on the wrist side of your wrist. All sensors remain fully operational. Both watches run simultaneously.

Model guides

Cartier iconic models

Each guide covers all references, variants, lug widths, and step-by-step Smartlet installation for one specific model line.

Compatible

Cartier

Santos de Cartier Large

The first pilot's wristwatch. Designed for Alberto Santos-Dumont in 1904, the Santos remains a landmark in watchmaking - square case, exposed screws, unmistakable silhouette.

Case

39.8mm

Lug width

19mm / 20mm / 23mm / 24mm

Movement

Cal. 1847 MC

References

19mm / 20mm / 23mm / 24mmView full guide →

Compatible

Cartier

Tank

The most copied case shape in history. Introduced in 1917, the Tank's rectangular form and Roman numerals define dress watch elegance across every generation.

Case

25mm×33mm / 33mm×42mm

Lug width

18mm / 19mm / 20mm / 21mm / 22mm

Movement

Cal. 1847 MC / 430 MC

References

18mm / 19mm / 20mm / 21mm / 22mmView full guide →

Full database

Other Cartier references

159 references grouped into 32 model families. All compatible. Expand any group to see variants, references, and specifications.

Astrocalendar

22mm 1 refs +

Reference Material Dial Lug Smartlet

ASTROCAL-RG-2016 18K Pink Gold Silver 22mm Compatible

Astroregulateur

22mm 1 refs +

Reference Material Dial Lug Smartlet

PROTO-ASTRO-2012 Carbon/Steel Black 22mm Compatible

Astrotourbillon

22mm 2 refs +

Reference Material Dial Lug Smartlet

ASTRO-CARBON-2015 Carbon/Steel Black 22mm Compatible

PROTO-ASTROCARB-2015 Carbon/Steel Black 22mm Compatible

Ballon

19mm / 20mm 3 refs +

Reference Material Dial Lug Smartlet

CPCP-BB-2005 18K Yellow Gold Blue Paris 19mm Compatible

WHBB0018 18K White Gold Skeleton 20mm Compatible

WHBB0007 Platinum Silver 20mm Compatible

CPCP

18mm / 19mm / 20mm / 22mm 5 refs +

Reference Material Dial Lug Smartlet

CPCP Rotonde

ROT-MONO-CPCP-2007 18K Rose Gold Silver 22mm Compatible

CPCP Tank

TCT-CPCP-1999 18K Yellow Gold Silver 20mm Compatible

TCHIN-CPCP-2004 18K Yellow Gold Guilloché 18mm Compatible

CPCP Tortue

TORT-MONO-CPCP-1998 18K Yellow Gold Guilloché 19mm Compatible

TORT-QP-CPCP-2003 18K Pink Gold Guilloché Silver 19mm Compatible

Calibre

22mm 8 refs +

Reference Material Dial Lug Smartlet

W7100056 Adlc Steel Black 22mm Compatible

W7100016 Stainless Steel Silver 22mm Compatible

W7100015 Stainless Steel Black 22mm Compatible

W7100041 Stainless Steel Silver 22mm Compatible

W7100061 Stainless Steel Silver 22mm Compatible

W7100062 Stainless Steel Black 22mm Compatible

W7100052 Stainless Steel Black 22mm Compatible

W7100055 Stainless Steel Blue 22mm Compatible

Ceinture

18mm 1 refs +

Reference Material Dial Lug Smartlet

CEINT-1973 18K Yellow Gold Silver 18mm Compatible

Cintrée

20mm 1 refs +

Reference Material Dial Lug Smartlet

CINT-1925-SAL 18K Yellow Gold Salmon 20mm Compatible

Concept

22mm 2 refs +

Reference Material Dial Lug Smartlet

Concept Carbon

FT-CARBON-2014 Carbon/Steel Black 22mm Compatible

Concept Diver

PROTO-DIVER-2015 Steel/Carbon Black 22mm Compatible

Crash

18mm 2 refs +

Reference Material Dial Lug Smartlet

WHTA0008 18K Pink Gold Skeleton 18mm Compatible

WHTA0009 Platinum Skeleton 18mm Compatible

Drive

20mm 9 refs +

Reference Material Dial Lug Smartlet

Drive Moonphase

DRIVE-MP-PLAT-2018 Platinum Silver 20mm Compatible

Drive Tourbillon

Drive-TB-WG-2019 18K White Gold Silver 20mm Compatible

Drive de

WGDR0006 18K Pink Gold Silver 20mm Compatible

WSNM0008 18K Pink Gold Silver Moonphase 20mm Compatible

WGNM0008 18K White Gold Silver 20mm Compatible

WGNM0004 Stainless Steel Silver 20mm Compatible

WGNM0005 Stainless Steel Grey 20mm Compatible

WSNM0005 Stainless Steel Silver Moonphase 20mm Compatible

WSNM0011 Stainless Steel Silver 20mm Compatible

Grand

18mm 1 refs +

Reference Material Dial Lug Smartlet

GCSW-2019 18K White Gold Diamond Pavé 18mm Compatible

High

18mm 1 refs +

Reference Material Dial Lug Smartlet

HJ-TORT-RNBW-2022 18K Pg/Rainbow Gems Silver 18mm Compatible

22mm 2 refs +

Reference Material Dial Lug Smartlet

ID One

ID-ONE-2010 Zirconia Ceramic Black 22mm Compatible

ID Two

ID-TWO-2012 Transparent Ceramyst Clear 22mm Compatible

ID-One

22mm 1 refs +

Reference Material Dial Lug Smartlet

IDONE-2010 Zirconia Ceramic Black 22mm Compatible

ID-Two

22mm 1 refs +

Reference Material Dial Lug Smartlet

IDTWO-2012 Transparent Ceramyst Transparent 22mm Compatible

Japan-Only

19mm / 20mm 2 refs +

Reference Material Dial Lug Smartlet

TL-JDM-BLU-2012 18K Pg Blue 19mm Compatible

TS-JDM-BLK-2018 Steel Black Roman 20mm Compatible

Masse

20mm 1 refs +

Reference Material Dial Lug Smartlet

WGMM0002 Platinum Skeleton Mystery 20mm Compatible

Middle

19mm 1 refs +

Reference Material Dial Lug Smartlet

TL-ME-GRN-2021 18K Pg Green Lacquer 19mm Compatible

Minute

22mm 2 refs +

Reference Material Dial Lug Smartlet

WSMR0005 18K Pink Gold Silver 22mm Compatible

WSMR0004 18K White Gold Silver 22mm Compatible

Mysterious

20mm 1 refs +

Reference Material Dial Lug Smartlet

WHDA0001 18K Pink Gold Silver Day/Night 20mm Compatible

One-of-One

18mm 1 refs +

Reference Material Dial Lug Smartlet

HJ-COMET-2020 Wg/Diamonds/Sapphire Midnight Blue 18mm Compatible

Pasha

18mm / 20mm / 22mm 7 refs +

Reference Material Dial Lug Smartlet

Pasha 38

W30012 18K Yellow Gold Silver 20mm Compatible

W31074M7 Stainless Steel Silver 20mm Compatible

Pasha 41

WSPA0018 Stainless Steel Blue 20mm Compatible

Pasha 42

WHPA0007 18K White Gold Skeleton 22mm Compatible

W31088U2 Stainless Steel Silver 22mm Compatible

Pasha C

W31043M7 Stainless Steel Black 18mm Compatible

W31030H3 Stainless Steel Silver 18mm Compatible

Pebble

18mm 3 refs +

Reference Material Dial Lug Smartlet

PEBBLE-1972 18K Yellow Gold White Roman 18mm Compatible

PEBBLE-2022 18K Yellow Gold White Roman 18mm Compatible

PBB-PLAT-2023 Platinum Silver 18mm Compatible

Prototype

20mm 2 refs +

Reference Material Dial Lug Smartlet

Prototype Mysterious

PROTO-MH-2011 Stainless Steel Silver 20mm Compatible

Prototype Skeleton

PROTO-TANK-SKEL-2010 Steel Skeleton 20mm Compatible

Ronde

18mm / 20mm 5 refs +

Reference Material Dial Lug Smartlet

Ronde Astromystérieuse

WHRO0033 Platinum Mysterious Silver 20mm Compatible

Ronde Louis

W6800151 18K Yellow Gold Silver 18mm Compatible

W9001352 18K White Gold Skeleton 20mm Compatible

Ronde Solo

WSRN0002 Stainless Steel Silver 20mm Compatible

WSRN0003 Stainless Steel Silver 18mm Compatible

Rotonde

20mm / 22mm 34 refs +

Reference Material Dial Lug Smartlet

Rotonde Annual

WR007001-AC Stainless Steel Silver 20mm Compatible

WR007001 Stainless Steel Silver 20mm Compatible

Rotonde Astronomystérieuse

WHRO0033 18K White Gold Silver Mysterious 20mm Compatible

ASTRO-WG-2019 18K White Gold Silver 20mm Compatible

Rotonde Astroregulateur

WHAST0001 Platinum Silver 22mm Compatible

Rotonde Astrotourbillon

WHR0N0005 18K Pink Gold Silver 22mm Compatible

WHR0N0007 18K White Gold Skeleton 22mm Compatible

WHRON0003 Platinum Silver 22mm Compatible

Rotonde Day

WR007009 Stainless Steel Silver Day/Night 20mm Compatible

DAYNIGHT-PLAT-2015 Platinum Silver/Blue 20mm Compatible

Rotonde Double

WHDT0001 Platinum Silver 22mm Compatible

WTG0001 Platinum Silver 22mm Compatible

Rotonde Earth

WHRO0017 18K Pink Gold Blue Lunar 22mm Compatible

WHRO0017 18K Pink Gold Navy/Silver 22mm Compatible

WHRO0016 Platinum Blue Lunar 22mm Compatible

WHRO0016 Platinum Navy/Silver 22mm Compatible

Rotonde Flying

W1556219 18K Pink Gold Silver 20mm Compatible

W1556218 18K White Gold Silver 20mm Compatible

Rotonde Grand

WHRO0009 Platinum Silver 22mm Compatible

Rotonde Grande

WHRO0009 Platinum Silver 22mm Compatible

WHRO0013 Platinum Silver 22mm Compatible

Rotonde Lunar

LUN-ORB-WG-2018 18K Wg Navy 22mm Compatible

Rotonde Minute

WHXR0002 18K Pink Gold Silver 22mm Compatible

WHME0003 Platinum Silver 22mm Compatible

Rotonde Mysterious

W1556233 18K Pink Gold Silver 20mm Compatible

WHRO0003 18K White Gold Silver 20mm Compatible

WHDD0001 Platinum Silver 22mm Compatible

WSRN0002 Stainless Steel Silver 20mm Compatible

Rotonde Perpetual

RRPC-PT-2014 Platinum Silver 20mm Compatible

Rotonde Skeleton

SKE-ASTRO-2013 White Gold Skeleton 22mm Compatible

WHRO0005 18K White Gold Skeleton 22mm Compatible

WHSA0009 18K White Gold Skeleton 22mm Compatible

WHRA0016 18K White Gold Skeleton Panther 20mm Compatible

MRSK-PLAT-2016 Platinum Skeleton 22mm Compatible

Santos

20mm / 23mm / 24mm 6 refs +

Reference Material Dial Lug Smartlet

W20106X8 Stainless Steel White 20mm Compatible

W20072X7 Steel/Yellow Gold White 23mm Compatible

W20073X8 Stainless Steel White 23mm Compatible

W20091X7 Stainless Steel White 24mm Compatible

WSSA0006 Steel Adlc Black 23mm Compatible

WSSA0014 Steel Adlc Black 23mm Compatible

Santos-Dumont

19mm / 20mm 7 refs +

Reference Material Dial Lug Smartlet

Santos-Dumont Large

WJSA0018 18K Pink Gold Silver 19mm Compatible

WSSA0022 Stainless Steel Silver 19mm Compatible

W2SA0011 Steel/Yellow Gold Silver 19mm Compatible

Santos-Dumont Limited

WGSA0052 18K Pink Gold Burgundy Lacquer 20mm Compatible

Santos-Dumont Skeleton

SDSM-MR-2023 Titanium/Sapphire Skeleton 20mm Compatible

Santos-Dumont Tokyo

SD-TOKYO-2019 Steel Navy Tokyo 20mm Compatible

Santos-Dumont XL

WGSA0032 18K Pink Gold Silver 20mm Compatible

Special

19mm / 20mm / 21mm / 22mm 4 refs +

Reference Material Dial Lug Smartlet

S0-SD-XL-2018 18K Wg Blue Enamel 20mm Compatible

SO-TORT-SAL-2019 18K Pink Gold Salmon 19mm Compatible

SO-CINT-SAL-2020 18K Yellow Gold Salmon 21mm Compatible

SO-TONNEAU-PLAT-2016 Platinum Silver 22mm Compatible

Tank

18mm / 19mm / 20mm / 21mm / 22mm 36 refs +

Reference Material Dial Lug Smartlet

Tank Américaine

W2603256 18K Yellow Gold Silver 20mm Compatible

W2607456 18K White Gold Blue 20mm Compatible

WAETA0017 18K White Gold Silver 22mm Compatible

WJTA0013 18K Pink Gold Silver/ Diamonds 18mm Compatible

WSTA0017 Stainless Steel Silver 20mm Compatible

WSTA0016 Stainless Steel Silver 19mm Compatible

Tank Asymétrique

ASYM-RG-2020 18K Rg Silver 20mm Compatible

ASYM-PLAT-2020 Platinum Silver 20mm Compatible

Tank Basculante

BASC-1932 18K White Gold White Enamel 18mm Compatible

BASC-CPCP-1999 18K Yellow Gold Guilloché Silver 18mm Compatible

BASC-STEEL-1990 Stainless Steel Silver 18mm Compatible

BASC-XL-2004 Stainless Steel Silver 20mm Compatible

Tank Chinoise

CHIN-1922 18K Yellow Gold White Enamel 18mm Compatible

CHIN-CPCP-1998 18K Yellow Gold Silver 18mm Compatible

WGTA0075 18K Rose Gold Silver 20mm Compatible

WGTA0074 Platinum Silver 20mm Compatible

Tank Cintree

CINT-PAR-1965 18K Yellow Gold Silver 20mm Compatible

Tank Cintrée

CINT-1921 18K Yellow Gold White Enamel 20mm Compatible

CINT-CPCP-1998 18K Yellow Gold Guilloché Silver 20mm Compatible

CINT-CPCP-RG-2002 18K Rose Gold Guilloché 20mm Compatible

WHCT0003 18K Yellow Gold Skeleton 20mm Compatible

CINT-1935 Platinum White 20mm Compatible

CINT-PLAT-BLU-2018 Platinum Silver/Blue 20mm Compatible

CINT-ANNIV-2021 Platinum Silver 20mm Compatible

TCP-SKEL-2021 Platinum Skeleton 21mm Compatible

Tank Ellipse

ELLIPSE-1970 18K Yellow Gold White 18mm Compatible

Tank Etanche

T-ETANCHE-1931 Stainless Steel White 18mm Compatible

Tank Louis

W1529756 18K Yellow Gold Silver 19mm Compatible

WHTN0006 18K White Gold Skeleton 19mm Compatible

WBCP0006 18K Pink Gold Blue 19mm Compatible

WGTA0010 Platinum Silver 19mm Compatible

Tank Must

WSTA0042 Stainless Steel Silver 19mm Compatible

WSTA0054 Stainless Steel Burgundy 19mm Compatible

WSTA0055 Stainless Steel Green 19mm Compatible

WSTA0056 Stainless Steel Blue 19mm Compatible

Tank Normale

NORM-PLAT-2023 Platinum Silver 18mm Compatible

Tortue

19mm / 20mm 6 refs +

Reference Material Dial Lug Smartlet

Tortue 1912

TORT-1912-1998 18K Yellow Gold Silver 19mm Compatible

Tortue CPCP

TORT-CPCP-YG-1999 18K Yellow Gold Guilloché Silver 19mm Compatible

Tortue Monopoussoir

TORT-MONO-2004 18K Pink Gold Silver 19mm Compatible

Tortue Mysterious

TORT-MYS-RG-2015 18K Pink Gold Skeleton Mystery 19mm Compatible

TORT-MYS-WG-2015 18K White Gold Skeleton Mystery 19mm Compatible

Tortue Tourbillon

PROTO-TORT-TB-2012 18K Wg Silver 20mm Compatible

Compatible smartwatches

Smartwatches to pair with your Cartier

Wear your smartwatch simultaneously with your Cartier via Smartlet One. Lug widths 18mm to 24mm natively supported.

View all compatible smartwatches →

Questions

Frequently asked questions

Does Smartlet work with Cartier watches?+

Yes. Cartier references from 18mm to 24mm lug width are natively supported by Smartlet One.

Which Cartier models have guides?+

Santos de Cartier Large and Tank each have full reference tables with all variants and lug widths.

Will Smartlet affect the Cartier movement?+

No. Smartlet attaches via spring-bar slots. The case, crown, and movement are completely untouched.

One concept. Three personalities

Smartlet One worn with a mechanical watch and Apple Watch on the same wrist

Smartlet One - Classic

€349,00

Smartlet One - Shadow

€449,00

Smartlet One combining a luxury watch with a smartwatch on one wrist

Smartlet One - Titanium

€599,00

Join the movement

Smartlet One

Wear a smartwatchwith your Cartier

Three steps to both watches on one wrist

Cartier iconic models

Other Cartier references

Smartwatches to pair with your Cartier

Frequently asked questions

One concept. Three personalities

Wear a smartwatch
with your Cartier