On usedby, 7 companies use Giga and 50 use Sierra. No company is listed with both yet. Sierra leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 7, 2026: 57 of 57 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 Giga, Sierra, or both
Every company with a public proof for at least one of the two tools.
7
use only Giga
0
companies use both
50
use only Sierra
7 companies use only Giga, 50 use only Sierra and 0 use both, out of the 57 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 7, 2026.
Where it lands
Newest customers
Who uses both
Companies with a confirmed or observed line on both tools.
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Giga
SierraPricing, security and data residency are not checked yet. usedby adds them from each vendor's public pages, with the date of the check.
What customers report
Results as the vendor or the customer published them, with the source and the date.
Giga
No reviewed story for Giga yet.
Sierra
Nearly 1,000 hours per month returned to exception handling and high-value work
RunBuggy
Vendor case study, sierra.ai, published Feb 3, 2026
Questions about Giga and Sierra
Which is used more, Giga or Sierra?
Sierra has more customers on usedby: 50 against 7 for Giga.
Do companies use both Giga and Sierra?
usedby has not found a company with a confirmed or observed line on both Giga and Sierra yet.
Who uses Giga?
7 companies on usedby, each with the public page that shows it. See who uses Giga.
Who uses Sierra?
50 companies on usedby, each with the public page that shows it. See who uses Sierra.
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.