Heap vs Monte Carlo: who uses which
Customers, public proof and the companies that use both.
On usedby, 17 companies use Heap and 69 use Monte Carlo. 1 company uses both, including Dropbox. Monte Carlo leads among the Fintech & Payments companies on usedby that use either tool.Latest check Nov 13, 2026: 86 of 86 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 Heap, Monte Carlo, or both
Every company with a public proof for at least one of the two tools.
16
listed for Heap only
1
company uses both
68
listed for Monte Carlo only
On usedby, 16 companies are listed for Heap only, 68 are listed for Monte Carlo only and 1 uses both, out of the 85 companies listed for at least one. An absent listing does not prove non-use.
Where it lands
Recently publicly listed customers
No new public customer listing since tracking started on October 7, 2026.
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, Monte Carlo |
|---|---|
 Dropbox | On or before Oct 2026 |
By industry
Which tool the companies on usedby use, by industry. Shares of the companies on usedby that use Heap, Monte Carlo or both: a share of the companies on usedby, not of the market.
Listed for Heap onlyBothListed for Monte Carlo only
More common with Monte Carlo
- Fintech & Payments7 of the 7 Fintech & Payments companies on usedby that use either tool use Monte Carlo.
- E-commerce & D2C4 of the 5 E-commerce & D2C companies on usedby that use either tool use Monte Carlo.
- Media & Publishing5 of the 5 Media & Publishing companies on usedby that use either tool use Monte Carlo.
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.
Vendor facts checked: Heap, 0 of 5; Monte Carlo, 3 of 5. Missing facts remain unverified, not absent features.
HeapMonte CarloWhat customers report
Results as the vendor or the customer published them, with the source and the date.
Heap
We have over 220 employees in Heap running over 44,000 queries on a monthly basis.
Amway
Vendor case study, heap.io, captured Nov 13, 2026
This has saved Esurance an average of $225K a month since the fix went into production.
Esurance
Vendor case study, heap.io, captured Nov 13, 2026
Monte Carlo
No reviewed story for Monte Carlo yet.
Questions about Heap and Monte Carlo
Which is used more, Heap or Monte Carlo?
Monte Carlo has more customers on usedby: 69 against 17 for Heap.
Do companies use both Heap and Monte Carlo?
Yes. 1 company uses both on usedby, including Dropbox.
Who uses Heap?
17 companies on usedby, each with the public page that shows it. See who uses Heap.
Who uses Monte Carlo?
69 companies on usedby, each with the public page that shows it. See who uses Monte Carlo.
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 four proof levels: confirmed, declared by the company itself, 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.