On usedby, 40 companies use Regal and 10 use Vapi. No company is listed with both yet.Latest check Oct 8, 2026: 50 of 50 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 Regal, Vapi, or both
Every company with a public proof for at least one of the two tools.
40
use only Regal
0
companies use both
10
use only Vapi
40 companies use only Regal, 10 use only Vapi and 0 use both, out of the 50 companies on usedby that use at least one of them.
Where it lands
Newest customers
No new customer since tracking started on October 8, 2026.
Where it lands
Newest customers
No new customer since tracking started on October 8, 2026.
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.
Regal
VapiWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Regal
HealthBird instantly saw a 250% lift in agent productivity from using their Sales Dialer.
Healthbird
Vendor case study, regal.ai, captured Oct 8, 2026
Vapi
100+ engineering hours saved per month, with all voice infrastructure work eliminated
Fleetworks
Vendor case study, vapi.ai, captured Oct 8, 2026
85% lower cost: To keep up with demand, Instawork was projecting millions of dollars in costs to use human call screening.
Instawork
Vendor case study, vapi.ai, captured Oct 8, 2026
Questions about Regal and Vapi
Which is used more, Regal or Vapi?
Regal has more customers on usedby: 40 against 10 for Vapi.
Do companies use both Regal and Vapi?
usedby has not found a company with a confirmed or observed line on both Regal and Vapi yet.
Who uses Regal?
40 companies on usedby, each with the public page that shows it. See who uses Regal.
Who uses Vapi?
10 companies on usedby, each with the public page that shows it. See who uses Vapi.
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.