Head to head
Prospeo vs Seamless.AI
As a data enrichment API, Prospeo rates higher on the APIbenchmarks Index, 71.8 to 68.3, a 3.5-point gap. Here is how they compare on each criterion.
Criterion by criterion
| Criterion | Prospeo | Seamless.AI |
|---|---|---|
| Documentation & DX | ||
| Reliability | ||
| Ecosystem & SDKs | ||
| Accessibility | ||
| APIbenchmarks Index | 71.8 | 68.3 |
Specifications
| Prospeo | Seamless.AI | |
|---|---|---|
| Best for | Verified email and mobile finding for outbound | Prospecting teams wanting UI plus API and MCP |
| Free tier | 100 credits/mo, API access included | Free plan (50 lifetime credits per third party; API eligibility unconfirmed) |
| Pricing | Per credit (email 0.5-1, mobile 10) | Per credit; sales-led Pro/Enterprise |
| Official SDKs | 4 languages | 6 languages |
Is Prospeo better than Seamless.AI?
On the APIbenchmarks Index, Prospeo rates higher (71.8 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
Prospeo leads by 3.5 points (71.8 vs 68.3) and wins 2 of 4 criteria; Seamless.AI wins 2.
Winner by criterion
| Criterion | Winner | ||
|---|---|---|---|
| Documentation & DX | 78 | 76 | |
| Reliability | 66 | 74 | |
| Ecosystem & SDKs | 62 | 68 | |
| Accessibility | 82 | 50 |
Choose Prospeo if… / choose Seamless.AI if…
- →documentation & dx matters most to you (78 vs 76)
- →accessibility matters most to you (82 vs 50)
- →your use case matches its focus: verified email and mobile finding for outbound
- →reliability matters most to you (74 vs 66)
- →ecosystem & sdks matters most to you (68 vs 62)
- →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
- Per credit (email 0.5-1, mobile 10)
- Free tier
- 100 credits/mo, API access included
- Free$0
- StarterAbout $49/mo ($37/mo annual)
- GrowthAbout $99/mo ($74/mo annual)
- ProAbout $249/mo ($187/mo annual)
- 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 (Prospeo) and 2026-10-07 (Seamless.AI).
SDK and language coverage
Both · 2
REST APIMCP server (mcp.prospeo.io)
Only Prospeo · 2
Composio and workflow-tool integrationsNo official SDKs found
Only Seamless.AI · 4
OpenAPI YAML/JSONPostman collectioncurl, Python and Node examplesNo official language SDKs found
Strengths and weaknesses
- +Free API access stated in the docs
- +Plan-tiered published rate limits and per-endpoint credit costs
- +Search over 200M+ contacts and 30M+ companies with 30+ filters
- –Unused credits expire every billing cycle
- –Per-user pricing multiplies for teams
- –Mobile reveals cost 10 credits
- +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
Prospeo vs Seamless.AI: questions
- Which has better documentation, Prospeo or Seamless.AI?
- Prospeo scores higher on documentation and developer experience: 78 vs 76 out of 100.
- Which is more reliable, Prospeo or Seamless.AI?
- Seamless.AI scores higher on reliability: 74 vs 66 out of 100.
- Do Prospeo and Seamless.AI have a free tier?
- Prospeo: yes (100 credits/mo, API access included). Seamless.AI: yes (Free plan (50 lifetime credits per third party; API eligibility unconfirmed)).
- How are Prospeo and Seamless.AI priced?
- Prospeo: Per credit (email 0.5-1, mobile 10). Seamless.AI: Per credit; sales-led Pro/Enterprise.
- Which has more official SDKs?
- Seamless.AI lists 6 official SDKs, Prospeo lists 4.