BILL vs Slash: most-reported complaints compared
Most-reported issues at BILL and Slash, according to reviewers on Trustpilot — classified by our automated reader and backed by verbatim quotes from distinct reviews. This is a side-by-side of what reviewers report, not a score, rating or recommendation for either company.
BILL
TrustScore 1.6 · 1,682 reviews on Trustpilot.
133 reviews analysed, 2026-02-09 to 2026-11-11.
Complaint rate (recent window): 98%
0% of negative reviews get a company reply.
“The verification went to an old email we no longer had access to. Took them days to respond.”
Slash
TrustScore 4.4 · 442 reviews on Trustpilot.
187 reviews analysed, 2025-11-04 to 2026-11-01.
Complaint rate (recent window): 16%
37% of negative reviews get a company reply.
“customer support will ghost you”
Reported on both
Issues with an evidenced category (at least two verbatim quotes) on both sides.
| Issue | BILL | Slash |
|---|---|---|
| Support unhelpful | 43% | 34% |
| Account/app problems | 39% | 52% |
| Support unreachable | 33% | 38% |
| Billing errors | 27% | 10% |
Method: reviews are classified into a fixed complaint taxonomy by an automated reader; every category shown is backed by at least two verbatim quotes from distinct reviews. Figures are census classifications, not official statistics, and reflect what reviewers reported — not findings of wrongdoing by either company. Not affiliated with, endorsed by, or sponsored by Trustpilot A/S, BILL or Slash.