On usedby, 128 companies use Retool and 6 use v0. 1 company uses both, including OpenAI. Retool leads among the Fintech & Payments companies on usedby that use either tool.Latest check Oct 15, 2026: 127 of 134 public lines checked. Counts include every proof level, job-post signals included. A company on both tools counts at any proof level, and a job post on one side is marked as such.
Who uses Retool, v0, or both
Every company with a public proof for at least one of the two tools.
127
use only Retool
1
company uses both
5
use only v0
127 companies use only Retool, 5 use only v0 and 1 uses both, out of the 133 companies on usedby that use at least one of them.
Where it lands
Recently publicly listed customers
Who uses both
Companies with a public line on both tools, at any proof level: the strongest proofs come first, and a job post is marked.
| Company | First public proof, Retool |
|---|---|
 OpenAI | On or before Oct 2024 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Retool, v0 or both: a share of the companies on usedby, not of the market.
Retool onlyBothv0 only
More common with Retool
- Fintech & Payments16 of the 17 Fintech & Payments companies on usedby that use either tool use Retool.
- E-commerce & D2C10 of the 10 E-commerce & D2C companies on usedby that use either tool use Retool.
- Data & Analytics6 of the 6 Data & Analytics companies on usedby that use either tool use Retool.
Source: every usedby line, from confirmed proofs to job-post signals (the weakest proof level).
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Retool
v0What customers report
Results as the vendor or the customer published them, with the source and the date.
Retool
use Retool to build and manage over 100 internal solutions for every team
Ramp
Vendor case study, retool.com, captured Oct 8, 2026
improved the company’s time-to-deployment KPI by 3x
Greenly
Vendor case study, retool.com, captured Oct 8, 2026
v0
No reviewed story for v0 yet.
Questions about Retool and v0
Which is used more, Retool or v0?
Retool has more customers on usedby: 128 against 6 for v0.
Do companies use both Retool and v0?
Yes. 1 company uses both on usedby, including OpenAI.
Who uses Retool?
128 companies on usedby, each with the public page that shows it. See who uses Retool.
Who uses v0?
6 companies on usedby, each with the public page that shows it. See who uses v0.
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 counts as using both tools when it has a line on each, at any level; the list shows the strongest proofs first and marks job posts.