Head to head
FullContact vs ZoomInfo
As a data enrichment API, FullContact rates higher on the APIbenchmarks Index, 68.4 to 67.5, a 0.9-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | FullContact | ZoomInfo |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 68.4 | 67.5 |
Specifications
| FullContact | ZoomInfo | |
|---|---|---|
| Best for | Identity resolution / Identity Graph | Enterprise B2B intelligence |
| Free tier | 100 API calls/mo (Developer plan) | No |
| Pricing | Per matched API call | Annual contract + bulk credits |
| Official SDKs | 7 languages | 3 languages |
Is FullContact better than ZoomInfo?
On the APIbenchmarks Index, FullContact rates higher (68.4 vs 67.5). It leads on the four weighted criteria, but price is reported separately, so the best choice still depends on your budget.
Verdict in one line
FullContact leads by 0.9 points (68.4 vs 67.5) and wins 1 of 4 criteria; ZoomInfo wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 70 | 70 | Tie |
| Reliability | 70 | 90 | |
| Ecosystem & SDKs | 62 | 72 | |
| Accessibility | 72 | 30 |
Choose FullContact if… / choose ZoomInfo if…
- →accessibility matters most to you (72 vs 30)
- →you want a free tier to start (100 API calls/mo (Developer plan))
- →you need broad SDK coverage (7 official SDKs vs 3)
- →your use case matches its focus: identity resolution / identity graph
- →reliability matters most to you (90 vs 70)
- →ecosystem & sdks matters most to you (72 vs 62)
- →your use case matches its focus: enterprise b2b intelligence
Pricing side by side
- Model
- Per matched API call
- Free tier
- 100 API calls/mo (Developer plan)
- Developer (Free)$0
- Growth$99/month
- Basic~$500/month
- Premium~$2,000/month
- Enterprise$10,000+/month (custom)
- Model
- Annual contract + bulk credits
- Free tier
- No
- ZoomInfo Lite$0
- Professional~$14,995/year
- Advanced~$24,995-$30,000/year
- Elite$39,995+/year
- Enrichment API (HubSpot Marketplace)from ~$5,000/year
- Full Prospecting / Enterprise APIfrom ~$50,000/year
Vendor-published pricing, verified 2026-06-27 (FullContact) and 2026-06-27 (ZoomInfo).
SDK and language coverage
Both · 1
Python (official V3 client)
Only FullContact · 6
Go (official V3 client)Java 8 (official V3 client)Java 11+ (official V3 client)Ruby (archived/legacy)PHP (archived/legacy)Postman collection
Only ZoomInfo · 2
Java (PKI auth library)NodeJS (PKI auth library)
Strengths and weaknesses
- +Multi-field enrichment: accepts many identifier types (email, phone, name+address, social URLs/usernames, MAIDs, plus Resolve PersonIDs) to lift match rates
- +Deep attribute coverage, 900+ appendable data attributes via Person Insights Bundles (demographics, household, employment history, affinities, shopping habits)
- +Tunable confidence: ML 'Belief Vector' lets callers set confidence thresholds per request to balance precision vs. match rate
- –Real-world match rates often far below the advertised 93%, reviewers report ~40-50%, especially outside the U.S.
- –Data-quality complaints of false positives in age, employment, and education fields, with no data-freshness timestamps on attributes
- –Rate limit (~600 queries/min) too low for large batch enrichment jobs
- +Deepest enterprise B2B database among enrichment APIs: ~321M+ contacts across 104M+ companies with strong direct-dial and mobile phone coverage
- +Excellent accuracy and coverage for US/North American enterprise contacts (VP+ at 200+ employee firms)
- +Asynchronous Scaling APIs with webhook callbacks handle large batch enrichment jobs cleanly
- –Opaque, sales-gated pricing with five-figure annual minimums (~$50K/year for the full API)
- –Coverage and accuracy drop sharply outside the US/Canada
- –Data freshness is cycle-based (~90-day validation refresh), not real-time, leading to email bounces in cold outreach
FullContact vs ZoomInfo: questions
- Which has better documentation, FullContact or ZoomInfo?
- FullContact and ZoomInfo score the same on documentation and developer experience (70).
- Which is more reliable, FullContact or ZoomInfo?
- ZoomInfo scores higher on reliability: 90 vs 70 out of 100.
- Do FullContact and ZoomInfo have a free tier?
- FullContact: yes (100 API calls/mo (Developer plan)). ZoomInfo: no free tier.
- How are FullContact and ZoomInfo priced?
- FullContact: Per matched API call. ZoomInfo: Annual contract + bulk credits.
- Which has more official SDKs?
- FullContact lists 7 official SDKs, ZoomInfo lists 3.