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Tools · iot platforms protocols · Alternatives

I2C alternatives

As of 4 November 2026, 39 iot platforms protocols are named by companies instead of I2C: Modbus by 2,067 companies, CAN bus by 1,760, SPI by 1,559.

As of 4 November 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.

I2C, companies in postings
1,515
Most used alternative
Modbus · 2,067
Fastest hiring, 90 days
Modbus
Alternatives ranked
39
Catalogue
T-1.0.1-prov
01Ranked by evidence

iot platforms protocols companies choose instead of I2C

Companies naming each tool in their own postings, and postings in the last 90 days. Bars are relative to the category leader.

#AlternativeCompaniescompaniesvs I2Cpostings, 90 dCompare
1
ModbusModbus Organization
2,067136%5,698I2C vs Modbus →
2
CAN busISO
1,760116%5,610I2C vs CAN bus →
3
SPIMotorola
1,559103%4,935I2C vs SPI →
4
UART(industry standard)
1,23782%3,224I2C vs UART →
5
MQTTOASIS
1,20179%2,656I2C vs MQTT →
6
EtherNet/IPODVA
1,04869%2,374I2C vs EtherNet/IP →
7
OPC UAOPC Foundation
93562%2,090I2C vs OPC UA →
8
PROFINETPROFIBUS & PROFINET International
91460%2,036I2C vs PROFINET →
9
PROFIBUSPROFIBUS & PROFINET International
70146%1,645I2C vs PROFIBUS →
10
BACnetASHRAE
59839%1,743I2C vs BACnet →
11
USBUSB Implementers Forum
59739%1,786I2C vs USB →
12
Bluetooth Low EnergyBluetooth SIG
47331%934I2C vs Bluetooth Low Energy →
13
RS-485TIA
46431%1,001I2C vs RS-485 →
14
OPC (OPC UA)OPC Foundation
45130%1,193I2C vs OPC (OPC UA) →
15
RS-232EIA
44629%1,038I2C vs RS-232 →
16
KNXKNX Association
40126%703I2C vs KNX →
17
EtherCATEtherCAT Technology Group
37825%884I2C vs EtherCAT →
18
BluetoothBluetooth SIG
34623%659I2C vs Bluetooth →
19
IEC 61850IEC
32421%1,126I2C vs IEC 61850 →
20
DNP3IEEE
32121%895I2C vs DNP3 →
21
DeviceNetODVA
28519%598I2C vs DeviceNet →
22
DDS (Data Distribution Service)Object Management Group
28018%663I2C vs DDS (Data Distribution Service) →
23
LIN BusLIN Consortium
26618%1,210I2C vs LIN Bus →
24
CAN FDBosch
18112%545I2C vs CAN FD →
25
RS-422TIA/EIA
18012%607I2C vs RS-422 →
26
SAE J1939SAE International
17912%468I2C vs SAE J1939 →
27
ZigbeeConnectivity Standards Alliance
17912%427I2C vs Zigbee →
28
UDS (ISO 14229)ISO
17512%552I2C vs UDS (ISO 14229) →
29
GPIO
16811%380I2C vs GPIO →
30
CANopenCAN in Automation
16211%293I2C vs CANopen →
31
NFCNFC Forum
14710%366I2C vs NFC →
32
DMX512USITT
1228%150soon
33
LonWorksEchelon
1158%403soon
34
ARINCSAE ITT
1148%492soon
35
EcoStruxureSchneider Electric
1097%339soon
36
LoRaWANLoRa Alliance
1087%185soon
37
Azure IoT HubMicrosoft
1007%162soon
38
DALIDiiA
997%154soon
39
HART ProtocolFieldComm Group
997%265soon
20,804 companies name a iot platforms protocol in their postings.

Filter on any of them, or on I2C users who also name an alternative, and open the person who owns the stack.

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Start free, no card. The first 20 are above; e-mails are verified at the mail server when you open them.

Cite this

Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.

39 iot platforms protocols are named by companies instead of I2C: Modbus by 2,067 companies, CAN bus by 1,760, SPI by 1,559, measured from their own job postings. (Breaknorm, 4 November 2026, https://breaknorm.co/tools/i2c/alternatives)
How we know

Read from the source, not self-reported

Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →

  • RankingCompanies whose own postings name the tool as the team's system, from the Breaknorm technology catalogue T-1.0.1-prov. Editions are folded into their parent product.
  • 90-day postingsOpen postings first seen or posted in the last 90 days that name the tool.
  • Not includedRatings, prices, feature claims, sponsored positions.
FAQ

I2C alternatives: questions

What is the most used alternative to I2C?

Modbus: 2,067 companies name it in their own job postings, against 1,515 for I2C.

How is this list ranked?

By the number of companies whose own postings name the tool as the team's system (Breaknorm technology catalogue T-1.0.1-prov), then by postings in the last 90 days. No ratings, no vendor input, no sponsored positions.

Does this say which is better?

No. It says who uses what, by company size, industry and country, so you can see which tools companies like yours choose. For features and prices, read the vendors.

Can I get the companies on any of these?

Yes: click the tool, see the first 20 companies, and sign up for the full list with verified e-mails. Counting is free.

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