Head to head
FullEnrich vs Seamless.AI
As a data enrichment API, FullEnrich rates higher on the APIbenchmarks Index, 72.5 to 68.3, a 4.2-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | FullEnrich | Seamless.AI |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 72.5 | 68.3 |
Specifications
| FullEnrich | Seamless.AI | |
|---|---|---|
| Best for | Waterfall email and mobile enrichment | Prospecting teams wanting UI plus API and MCP |
| Free tier | 50 free trial credits, no card | Free plan (50 lifetime credits per third party; API eligibility unconfirmed) |
| Pricing | Per successful result (email 1, mobile 10) | Per credit; sales-led Pro/Enterprise |
| Official SDKs | 5 languages | 6 languages |
Is FullEnrich better than Seamless.AI?
On the APIbenchmarks Index, FullEnrich rates higher (72.5 vs 68.3). 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
FullEnrich leads by 4.2 points (72.5 vs 68.3) and wins 2 of 4 criteria; Seamless.AI wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 80 | 76 | |
| Reliability | 66 | 74 | |
| Ecosystem & SDKs | 64 | 68 | |
| Accessibility | 80 | 50 |
Choose FullEnrich if… / choose Seamless.AI if…
- →documentation & dx matters most to you (80 vs 76)
- →accessibility matters most to you (80 vs 50)
- →your use case matches its focus: waterfall email and mobile enrichment
- →reliability matters most to you (74 vs 66)
- →ecosystem & sdks matters most to you (68 vs 64)
- →you need broad SDK coverage (6 official SDKs vs 5)
- →your use case matches its focus: prospecting teams wanting ui plus api and mcp
Pricing side by side
- Model
- Per successful result (email 1, mobile 10)
- Free tier
- 50 free trial credits, no card
- Free trial$0
- Starter / ProAbout $29-$55/mo (third-party figures)
- EnterpriseCustom
- 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 (FullEnrich) and 2026-10-07 (Seamless.AI).
SDK and language coverage
Both · 2
REST API (v1, v2)MCP server
Only FullEnrich · 3
OpenAPI specsZapier, Make, n8n, Clay, HubSpot integrationsNo official SDKs found
Only Seamless.AI · 4
OpenAPI YAML/JSONPostman collectioncurl, Python and Node examplesNo official language SDKs found
Strengths and weaknesses
- +Waterfall across 20+ providers with success-based billing
- +Webhook delivery recommended, plus polling for results
- +v1 and v2 OpenAPI specs and an llms.txt docs index
- –No official SDKs found
- –Mobile reveals cost 10 credits and personal emails 3
- –Enrichment-only: no signals, outreach or native CRM breadth
- +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
FullEnrich vs Seamless.AI: questions
- Which has better documentation, FullEnrich or Seamless.AI?
- FullEnrich scores higher on documentation and developer experience: 80 vs 76 out of 100.
- Which is more reliable, FullEnrich or Seamless.AI?
- Seamless.AI scores higher on reliability: 74 vs 66 out of 100.
- Do FullEnrich and Seamless.AI have a free tier?
- FullEnrich: yes (50 free trial credits, no card). Seamless.AI: yes (Free plan (50 lifetime credits per third party; API eligibility unconfirmed)).
- How are FullEnrich and Seamless.AI priced?
- FullEnrich: Per successful result (email 1, mobile 10). Seamless.AI: Per credit; sales-led Pro/Enterprise.
- Which has more official SDKs?
- Seamless.AI lists 6 official SDKs, FullEnrich lists 5.