Codeium vs Tessl: who uses which
Customers, public proof and the companies that use both.
On usedby, 18 companies use Codeium and 11 use Tessl. 2 companies use both, including Cisco and Zillow.Latest check Oct 6, 2026: 11 of 29 public lines checked. Counts include every proof level, job-post signals included. Companies named on both have a confirmed or observed line on each side.
Who uses Codeium, Tessl, or both
Every company with a public proof for at least one of the two tools.
16
use only Codeium
2
companies use both
9
use only Tessl
16 companies use only Codeium, 9 use only Tessl and 2 use both, out of the 27 companies on usedby that use at least one of them.
Who uses both
Companies with a confirmed or observed line on both tools.
| Company |
|---|
 Cisco |
 Zillow |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Codeium
TesslWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Questions about Codeium and Tessl
Which is used more, Codeium or Tessl?
Codeium has more customers on usedby: 18 against 11 for Tessl.
Do companies use both Codeium and Tessl?
Yes. 2 companies use both on usedby, including Cisco and Zillow.
Who uses Codeium?
18 companies on usedby, each with the public page that shows it. See who uses Codeium.
Who uses Tessl?
11 companies on usedby, each with the public page that shows it. See who uses Tessl.
How does usedby count customers?
A company counts when a public page shows it: a vendor's customer page, a case study, a press release or a job post, most saved with a dated capture. Every line is a customer, at one of three proof levels: confirmed, observed or signal (a job post, the weakest). A company is named as using both tools when its lines on both are confirmed or observed.