Grind Espresso
471 of 471 reviews · 100% coverage · googleReviewsChecker
No strong manipulation signal
Credible-reviewer 1★ rate
4.3%
Outside flagged months
100%
5★ from ≤2-review accts
4.9%
→
The estimate uses the lowest sufficiently sampled credible-reviewer cohort and never raises the displayed average. Manipulation risk does not subtract stars directly.
Why this boost score?
No campaign-like month was detected. The boost classifier is independent and can still flag account-history or timing patterns. Elevated risk begins at 35/100.
| Signal | Observed | Points |
|---|
| 5★ from ≤2-review accounts | 23 reviews (4.9%) | 5.2/30 |
| Reviews on burst days | 0 reviews on 0 days (0%) | 0/35 |
| Peak/median monthly ramp | 3.7× | 0.9/20 |
| Tightest five-minute cluster | 2 reviews | 0/15 |
| Total | | 6.1/100 |
Reviews per month by star rating
stack height = total reviews · gaps = zero-review months · outlined stacks = non-seasonal campaign-like months
Reviews per day (recent)
shows the 160 most recent active review dates; scoring uses the full dated history · red = burst day (≥8)
Credible reviewers — the quality test
| Reviewer pool | Rating | 1★ rate | ≤3★ share |
|---|
| All reviews | 4.49 | 5.5% | 11.5% |
| Veteran (≥20) | 4.486 | 5.1% | 11.6% |
| Veteran (≥50) — estimate basis | 4.521 | 3.6% | 9.5% |
| Most experienced (≥100) | 4.544 | 3.9% | 7.8% |
| Local Guides | 4.501 | 4.3% | 11.2% |
| Credible union (Local Guide or ≥20) | 4.5 | 4.3% | 11.2% |
| Credible outside campaign-like months | 4.5 | 4.3% | 11.2% |
Non-seasonal campaign-like months (0)
Each month is compared with the same calendar month in other years; ≥90% 5★ distinguishes positive campaigns from ordinary busy or complaint-heavy months.
| Month | Reviews | Other-year median | YoY ratio | 5★ | Mean |
|---|
| none — no non-seasonal, high-volume, ≥90% 5★ campaign-like months |
Burst days (≥8/day)
| Day | Reviews |
|---|
| none — no burst days |