Head to head
Apollo.io vs ZoomInfo
As a data enrichment API, Apollo.io rates higher on the APIbenchmarks Index, 80.1 to 67.5, a 12.6-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Apollo.io | ZoomInfo |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 80.1 | 67.5 |
Specifications
| Apollo.io | ZoomInfo | |
|---|---|---|
| Best for | Sales engagement plus enrichment | Enterprise B2B intelligence |
| Free tier | 10k credits/mo (verified corporate domain) or 100/mo | No |
| Pricing | Per credit (email 1, phone 8) | Annual contract + bulk credits |
| Official SDKs | 6 languages | 3 languages |
Is Apollo.io better than ZoomInfo?
On the APIbenchmarks Index, Apollo.io rates higher (80.1 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
Apollo.io leads by 12.6 points (80.1 vs 67.5) and wins 3 of 4 criteria; ZoomInfo wins 1.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 80 | 70 | |
| Reliability | 84 | 90 | |
| Ecosystem & SDKs | 78 | 72 | |
| Accessibility | 78 | 30 |
Choose Apollo.io if… / choose ZoomInfo if…
- →documentation & dx matters most to you (80 vs 70)
- →ecosystem & sdks matters most to you (78 vs 72)
- →accessibility matters most to you (78 vs 30)
- →you want a free tier to start (10k credits/mo (verified corporate domain) or 100/mo)
- →you need broad SDK coverage (6 official SDKs vs 3)
- →your use case matches its focus: sales engagement plus enrichment
- →reliability matters most to you (90 vs 84)
- →your use case matches its focus: enterprise b2b intelligence
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
- 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 (Apollo.io) and 2026-06-27 (ZoomInfo).
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 ZoomInfo · 3
Python (official zi_api_auth_client, MIT)Java (PKI auth library)NodeJS (PKI auth library)
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
- +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
Apollo.io vs ZoomInfo: questions
- Which has better documentation, Apollo.io or ZoomInfo?
- Apollo.io scores higher on documentation and developer experience: 80 vs 70 out of 100.
- Which is more reliable, Apollo.io or ZoomInfo?
- ZoomInfo scores higher on reliability: 90 vs 84 out of 100.
- Do Apollo.io and ZoomInfo have a free tier?
- Apollo.io: yes (10k credits/mo (verified corporate domain) or 100/mo). ZoomInfo: no free tier.
- How are Apollo.io and ZoomInfo priced?
- Apollo.io: Per credit (email 1, phone 8). ZoomInfo: Annual contract + bulk credits.
- Which has more official SDKs?
- Apollo.io lists 6 official SDKs, ZoomInfo lists 3.