Fullstory vs Heap: who uses which
Customers, public proof and the companies that use both.
On usedby, 35 companies use Fullstory and 17 use Heap. 1 company uses both, including Deepgram. Fullstory leads among the Fintech & Payments companies on usedby that use either tool.Latest check Nov 13, 2026: 52 of 52 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 Fullstory, Heap, or both
Every company with a public proof for at least one of the two tools.
34
listed for Fullstory only
1
company uses both
16
listed for Heap only
On usedby, 34 companies are listed for Fullstory only, 16 are listed for Heap only and 1 uses both, out of the 51 companies listed for at least one. An absent listing does not prove non-use.
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, Fullstory | First public proof, Heap |
|---|---|---|
 Deepgram | On or before Nov 2026 | On or before Nov 2026 |
Side by side
Facts from our data and from each vendor's public pages. Each line says where it comes from.
Vendor facts checked: Fullstory, 0 of 4; Heap, 0 of 4. Missing facts remain unverified, not absent features.
Fullstory
HeapNo verified public evidence is available for pricing or trust facts yet. A missing value does not mean the vendor lacks the feature.
What customers report
Results as the vendor or the customer published them, with the source and the date.
Fullstory
No reviewed story for Fullstory yet.
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
Questions about Fullstory and Heap
Which is used more, Fullstory or Heap?
Fullstory has more customers on usedby: 35 against 17 for Heap.
Do companies use both Fullstory and Heap?
Yes. 1 company uses both on usedby, including Deepgram.
Who uses Fullstory?
35 companies on usedby, each with the public page that shows it. See who uses Fullstory.
Who uses Heap?
17 companies on usedby, each with the public page that shows it. See who uses Heap.
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.