Head to head
ContactOut vs Seamless.AI
As a data enrichment API, Seamless.AI rates higher on the APIbenchmarks Index, 68.3 to 55, a 13.3-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | ContactOut | Seamless.AI |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 55.0 | 68.3 |
Specifications
| ContactOut | Seamless.AI | |
|---|---|---|
| Best for | LinkedIn-based email and phone lookup for recruiters and sales | Prospecting teams wanting UI plus API and MCP |
| Free tier | 5 emails, 5 phones, 5 exports/day in the app; API not included | Free plan (50 lifetime credits per third party; API eligibility unconfirmed) |
| Pricing | Credits (search, email, phone) on a quoted API plan | Per credit; sales-led Pro/Enterprise |
| Official SDKs | 4 languages | 6 languages |
Is ContactOut better than Seamless.AI?
On the APIbenchmarks Index, Seamless.AI rates higher (68.3 vs 55). 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
Seamless.AI leads by 13.3 points (68.3 vs 55) and wins 4 of 4 criteria.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 70 | 76 | |
| Reliability | 58 | 74 | |
| Ecosystem & SDKs | 50 | 68 | |
| Accessibility | 35 | 50 |
Choose ContactOut if… / choose Seamless.AI if…
- →your use case matches its focus: linkedin-based email and phone lookup for recruiters and sales
- →documentation & dx matters most to you (76 vs 70)
- →reliability matters most to you (74 vs 58)
- →ecosystem & sdks matters most to you (68 vs 50)
- →accessibility matters most to you (50 vs 35)
- →you need broad SDK coverage (6 official SDKs vs 4)
- →your use case matches its focus: prospecting teams wanting ui plus api and mcp
Pricing side by side
- Model
- Credits (search, email, phone) on a quoted API plan
- Free tier
- 5 emails, 5 phones, 5 exports/day in the app; API not included
- Free$0
- Email~$49-$99/mo (sources conflict)
- Email + Phone~$99-$199/mo (sources conflict)
- Team / APICustom quote
- Model
- Per credit; sales-led Pro/Enterprise
- Free tier
- Free plan (50 lifetime credits per third party; API eligibility unconfirmed)
- Free$0
- ProContact sales (third-party: about $4,740-$9,000/yr for 5 users)
- EnterpriseCustom
Vendor-published pricing, verified 2026-10-07 (ContactOut) and 2026-10-07 (Seamless.AI).
SDK and language coverage
Both · 1
REST API (token header auth)
Only ContactOut · 3
Webhooks for async bulk v2Third-party MCP via Composio and viaSocketNo official SDKs or OpenAPI spec found
Only Seamless.AI · 5
OpenAPI YAML/JSONPostman collectionMCP servercurl, Python and Node examplesNo official language SDKs found
Strengths and weaknesses
- +Public API reference with auth, endpoint credit rules and per-endpoint rate limits
- +Bulk enrichment up to 1,000 profiles per v2 job with webhook delivery
- +Boolean search, decision-maker and company endpoints plus email and phone verification
- –API is not on self-serve plans; Team/API requires a custom quote
- –Free app plan (5/5/5 per day) does not include API access
- –962 outages tracked by StatusGator over the past year, with a minor outage on the verification date
- +Modern async API with webhooks or polling plus OpenAPI YAML/JSON specs
- +MCP server with 57 tools documented for Claude, Cursor, VS Code and ChatGPT
- +Published rate limits and simple credit rules (search 1 credit per 10 results; polling free)
- –Plan eligibility for the API is unclear and sources conflict
- –60 requests/min per endpoint, restrictive for bulk jobs
- –Pro and Enterprise pricing is sales-led
ContactOut vs Seamless.AI: questions
- Which has better documentation, ContactOut or Seamless.AI?
- Seamless.AI scores higher on documentation and developer experience: 76 vs 70 out of 100.
- Which is more reliable, ContactOut or Seamless.AI?
- Seamless.AI scores higher on reliability: 74 vs 58 out of 100.
- Do ContactOut and Seamless.AI have a free tier?
- ContactOut: yes (5 emails, 5 phones, 5 exports/day in the app; API not included). Seamless.AI: yes (Free plan (50 lifetime credits per third party; API eligibility unconfirmed)).
- How are ContactOut and Seamless.AI priced?
- ContactOut: Credits (search, email, phone) on a quoted API plan. Seamless.AI: Per credit; sales-led Pro/Enterprise.
- Which has more official SDKs?
- Seamless.AI lists 6 official SDKs, ContactOut lists 4.