Quick answer: a 0–5 star scale is the most familiar and scannable, but the format should follow the context — a profile page, a product card, and a peer review all benefit from different visual treatments. Below are the most common patterns, with the tradeoffs of each.
Numeric scales
- 0–5 stars — universal, instantly readable, works on anything from Amazon to Uber drivers. Loses nuance (almost everyone clusters at 4.5).
- 0–100 score — used by credit and trust sites (Norton, Trustpilot's "TrustScore"). Feels precise but most users can't distinguish a 72 from a 78.
- Percentage — common for transaction trust (e.g., "98% successful deliveries"). Concrete, but harder to compare across sites.
Tiered labels
- Bands like Trusted / Verified / Caution / Avoid — clearer than numbers for non-technical users. Risk: feels judgmental without explanation.
- Badge tiers (Bronze / Silver / Gold / Platinum) — gamified, good for marketplaces. Easy to game if criteria aren't transparent.
- Status icons (✓ Verified, ⚠ Monitored, ✕ Flagged) — compact, fits next to names in lists.
Distribution + context
- Stars + review count ("★ 4.7 (1,243 reviews)") — much more honest than stars alone, because it shows whether the average is meaningful.
- Histogram (the Amazon-style 5/4/3/2/1 bar chart) — reveals whether a 4.5 average is real or driven by two perfect scores and one angry 1.
- Confidence interval or sample size label — "Based on 12 verifications" is more trustworthy than a naked score.
Qualitative signals (often underrated)
- "Verified by [third party]" with the verifier's logo — outsources credibility.
- Time-stamped activity ("Active today", "ID verified Mar 2026") — recency implies trustworthiness more than a static score.
- Specific guarantees ("Backed by $1M protection") — concrete beats abstract.
When to pick what
- Marketplace listings: stars + count, with a verified-purchase flag.
- User profiles on a platform: tiered badge + last-active timestamp.
- B2B / vendor trust: numeric score (0–100) with a short criteria breakdown.
- Crypto / wallet / dApp: security audit badges + open-source status.
- Quick glance in a list: a single colored dot (green/amber/red) is faster to parse than any number.
One thing worth resisting: don't stack every form at once. Pick the one or two that match the decision the user is making — adding a 0–100 score and tiers and stars on the same row makes people trust the system less, not more.