Head to head
Apollo.io vs FullContact
As a data enrichment API, Apollo.io rates higher on the APIbenchmarks Index, 80.1 to 68.4, a 11.7-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Apollo.io | FullContact |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 80.1 | 68.4 |
Specifications
| Apollo.io | FullContact | |
|---|---|---|
| Best for | Sales engagement plus enrichment | Identity resolution / Identity Graph |
| Free tier | 10k credits/mo (verified corporate domain) or 100/mo | 100 API calls/mo (Developer plan) |
| Pricing | Per credit (email 1, phone 8) | Per matched API call |
| Official SDKs | 6 languages | 7 languages |
Is Apollo.io better than FullContact?
On the APIbenchmarks Index, Apollo.io rates higher (80.1 vs 68.4). 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
Apollo.io leads by 11.7 points (80.1 vs 68.4) and wins 4 of 4 criteria.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 80 | 70 | |
| Reliability | 84 | 70 | |
| Ecosystem & SDKs | 78 | 62 | |
| Accessibility | 78 | 72 |
Choose Apollo.io if… / choose FullContact if…
- →documentation & dx matters most to you (80 vs 70)
- →reliability matters most to you (84 vs 70)
- →ecosystem & sdks matters most to you (78 vs 62)
- →accessibility matters most to you (78 vs 72)
- →your use case matches its focus: sales engagement plus enrichment
- →you need broad SDK coverage (7 official SDKs vs 6)
- →your use case matches its focus: identity resolution / identity graph
Pricing side by side
- Model
- Per credit (email 1, phone 8)
- Free tier
- 10k credits/mo (verified corporate domain) or 100/mo
- Free$0
- Basic$49/user/mo (annual)
- Professional$79/user/mo (annual)
- Organization$119/user/mo (annual)
- Overage credits$0.20 / credit
- 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)
Vendor-published pricing, verified 2026-06-27 (Apollo.io) and 2026-06-27 (FullContact).
SDK and language coverage
Both · 0
None
Only Apollo.io · 6
REST API (HTTPS / JSON)OpenAPI / Swagger specificationApollo MCP serverApollo CLIllms.txt index for AI agentsCommunity-built clients (e.g. Ruby gem EnaiaInc/apollo_io), no official first-party language SDKs
Only FullContact · 7
Go (official V3 client)Java 8 (official V3 client)Java 11+ (official V3 client)Python (official V3 client)Ruby (archived/legacy)PHP (archived/legacy)Postman collection
Strengths and weaknesses
- +Large database (275M+ contacts, 73M+ companies) with strong US coverage (~80–88% match accuracy)
- +Aggressive pricing that undercuts ZoomInfo/Lusha-class incumbents for comparable breadth
- +Bulk enrichment endpoints (up to 10 people or companies per call) reduce call volume
- –Data accuracy drops sharply outside the US (~60–73% in EU/APAC/LATAM); stale titles common
- –Phone numbers cost 8 credits each yet user-reported direct-dial accuracy is only ~50–70%
- –Credits expire every billing cycle with no rollover and no refund on unused balance
- +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
Apollo.io vs FullContact: questions
- Which has better documentation, Apollo.io or FullContact?
- Apollo.io scores higher on documentation and developer experience: 80 vs 70 out of 100.
- Which is more reliable, Apollo.io or FullContact?
- Apollo.io scores higher on reliability: 84 vs 70 out of 100.
- Do Apollo.io and FullContact have a free tier?
- Apollo.io: yes (10k credits/mo (verified corporate domain) or 100/mo). FullContact: yes (100 API calls/mo (Developer plan)).
- How are Apollo.io and FullContact priced?
- Apollo.io: Per credit (email 1, phone 8). FullContact: Per matched API call.
- Which has more official SDKs?
- FullContact lists 7 official SDKs, Apollo.io lists 6.