Head to head
Apollo.io vs Explorium
As a data enrichment API, Apollo.io rates higher on the APIbenchmarks Index, 80.1 to 77.4, a 2.7-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Apollo.io | Explorium |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 80.1 | 77.4 |
Specifications
| Apollo.io | Explorium | |
|---|---|---|
| Best for | Sales engagement plus enrichment | Agent-driven company and prospect enrichment |
| Free tier | 10k credits/mo (verified corporate domain) or 100/mo | 100 free credits, valid 90 days (not recurring) |
| Pricing | Per credit (email 1, phone 8) | Prepaid credit packages |
| Official SDKs | 6 languages | 7 languages |
Is Apollo.io better than Explorium?
On the APIbenchmarks Index, Apollo.io rates higher (80.1 vs 77.4). 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 2.7 points (80.1 vs 77.4) and wins 2 of 4 criteria; Explorium wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 80 | 82 | |
| Reliability | 84 | 70 | |
| Ecosystem & SDKs | 78 | 74 | |
| Accessibility | 78 | 84 |
Choose Apollo.io if… / choose Explorium if…
- →reliability matters most to you (84 vs 70)
- →ecosystem & sdks matters most to you (78 vs 74)
- →your use case matches its focus: sales engagement plus enrichment
- →documentation & dx matters most to you (82 vs 80)
- →accessibility matters most to you (84 vs 78)
- →you need broad SDK coverage (7 official SDKs vs 6)
- →your use case matches its focus: agent-driven company and prospect enrichment
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
- Prepaid credit packages
- Free tier
- 100 free credits, valid 90 days (not recurring)
- Free trial$0
- Lite$29.99
- Starter$149.99
- Growth$749.99
- Scale$7,499.99
- EnterpriseCustom
Vendor-published pricing, verified 2026-06-27 (Apollo.io) and 2026-10-07 (Explorium).
SDK and language coverage
Both · 1
REST API (HTTPS / JSON)
Only Apollo.io · 5
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 Explorium · 6
OpenAPI specification (/openapi.json)AgentSource MCP server (remote, Bearer auth)explorium-mcp-server (Python, pip)Python MCP SDK, LangGraph and OpenAI implementation guidesllms.txt documentation indexNo first-party REST language SDKs
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
- +Self-serve free account and public prepaid packages from $29.99, no sales call needed
- +OpenAPI spec and llms.txt published alongside the API reference
- +Documented rate limit (200 queries/min) with X-RateLimit-* headers and Retry-After
- –No public status page or independent uptime history found; 99.999% uptime is a vendor claim
- –No first-party REST language SDKs; Python path uses the generic MCP SDK
- –Free credits are a one-time 100-credit, 90-day grant
Apollo.io vs Explorium: questions
- Which has better documentation, Apollo.io or Explorium?
- Explorium scores higher on documentation and developer experience: 82 vs 80 out of 100.
- Which is more reliable, Apollo.io or Explorium?
- Apollo.io scores higher on reliability: 84 vs 70 out of 100.
- Do Apollo.io and Explorium have a free tier?
- Apollo.io: yes (10k credits/mo (verified corporate domain) or 100/mo). Explorium: yes (100 free credits, valid 90 days (not recurring)).
- How are Apollo.io and Explorium priced?
- Apollo.io: Per credit (email 1, phone 8). Explorium: Prepaid credit packages.
- Which has more official SDKs?
- Explorium lists 7 official SDKs, Apollo.io lists 6.