comparison
Siftfy vs OOPSpam
Updated May 12, 2026
Both are API-first spam classifiers aimed at developers. The shape of the score, the per-tier limits, and the way each handles non-English input differ — pick the one that maps to your traffic.
At a glance
| Siftfy | OOPSpam | |
|---|---|---|
| Output | Calibrated probability (0–1) | Numeric Score 0–6 (≥3 treated as spam) plus a Details object (isIPBlocked, isContentTooShort, etc.) |
| Free tier | 10,000 requests / month, no credit card | 40 spam checks at signup, one-time — no permanent monthly free tier |
| Paid pricing | $9 / mo + $0.0001 / req past 1M | Starter $23/mo: 25K calls → Freelance $49/mo: 100K → Agency $69/mo: 300K → Business $259/mo: 1M |
| Per-minute cap (free) | 60 / minute | Not publicly documented |
| Per-minute cap (paid) | 600 / minute, burst-tolerant | Not publicly documented |
| Latency (p99) | < 10ms, CPU only | Not publicly documented |
| Accuracy claim | 99.4% on a public spam test set | Not publicly documented as a percentage |
| Language support | Primarily English; non-English degrades | allowedLanguages parameter; specific language list at oopspam.com/docs |
| Self-hostable | No (managed only; dedicated on request) | No — managed cloud only |
| Stores request bodies | No — metadata only | GDPR-compliant; opt-in dashboard logging only |
| Auth model | Per-key API tokens, revocable in dashboard | Per-key API tokens (Agency tier and up: IP-restricted keys) |
| Official SDKs | Python (PyPI: siftfy) | WordPress plugin + first-party Zapier, Make, and Bubble.io integrations |
OOPSpam figures captured 2026-05-10 from oopspam.com pricing and oopspam.com/docs. If you spot something out of date, email hi@siftfy.io and we'll fix it.
Where OOPSpam genuinely beats Siftfy
The honest tradeoffs:
- No-code platform integrations. First-party Zapier, Make, and Bubble.io connectors mean a no-code builder can wire OOPSpam into a form without writing any backend. Siftfy is REST + Python SDK — you need code.
- Built-in metadata filters. Country / IP / language blocking and disposable-email detection are exposed directly in OOPSpam's API; we leave those decisions to your app layer.
- Multi-signal response shape. The Score 0–6 and Details object make it easy to show a human reviewer why something was flagged. Our calibrated probability is more compact but less self-documenting.
When Siftfy is the right call
- You want a calibrated probability (0–1) so you can pick the threshold appropriate to your false-positive tolerance, instead of a 0–6 integer with a fixed "≥3 = spam" rule.
- You're price-sensitive at low volume — Siftfy's free 10K req/mo and $9 entry tier are well below OOPSpam's $23/mo Starter (25K calls).
- You'd prefer a single REST POST that returns the answer inline, with no per-feature query string flags to remember.
- Your volume is bursty and you want a paid tier with a documented per-minute cap (600 / min) that flexes for spikes.
10,000 requests / month free, no credit card. Read the API docs or pricing.