Langtail VS Spanly
Compare Langtail VS Spanly, what is the difference between Langtail and Spanly?
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Summarize
Langtail summarize
Langtail Landing Page
Spanly summarize
Soon, more agents than humans will use your product via MCP. Spanly gives you full observability on the MCP server you ship: error rates, session traces, latency, client analytics, deploy alerts. Drop-in CLI or SDK. US & EU data residency. Built for SaaS engineering teams shipping MCP in production, alongside the Datadog, Sentry, or New Relic you already run.
Spanly Landing Page
Compare Details
Langtail details
| Categories | Large Language Models (LLMs), AI Testing, No-Code&Low-Code, Prompt Engineering, AI Developer Tools, AI API |
| Langtail Website | https://langtail.com?utm_source=toolify |
| Added Time | April 11 2024 |
| Langtail Pricing | -- |
Spanly details
| Categories | Large Language Models (LLMs), AI Monitor, AI Developer Tools |
| Spanly Website | https://www.spanly.com?utm_source=toolify |
| Added Time | June 30 2026 |
| Spanly Pricing | -- |
Comparison of usage
How to use Langtail?
Langtail can be used to test LLM prompts with real-world data, score tests with natural language, pattern matching, or custom code, and experiment with models, parameters, and prompts. It integrates with major LLM providers and offers a TypeScript SDK for developers.
How to use Spanly?
To use Spanly, you can integrate it into your MCP server by dropping the open-source SDK into your TypeScript or Python code, wrapping your server binary using the Spanly CLI, or deploying it as a Docker sidecar. Once configured with your API key, it automatically captures and traces all MCP-shaped traffic, allowing you to view analytics, errors, and session traces directly via the web dashboard or from your IDE using Spanly's built-in MCP server.
Compare Pros between Langtail and Spanly
Core features of Langtail
- LLM Testing
- AI Firewall
- Prompt Management
- Collaboration Tools
- Data-driven Insights
Core features of Spanly
- Protocol-aware tracing capturing full JSON-RPC payloads (arguments, results, errors)
- Real-time session tracking grouping requests end-to-end
- Comprehensive performance metrics broken down by p50, p95, and p99 durations
- Automated error tracking and grouping across servers and clients
- US & EU regional data residency options with GDPR-friendly architecture
- IDE integration allowing engineers to search traces and triage errors from tools like Claude Code or Cursor
Compare Use Cases
Use cases for Langtail
- Testing LLM prompts before deployment
- Blocking AI attacks and unsafe outputs
- Managing and refining prompts across teams
- Gaining insights from test results and analytics
Use cases for Spanly
- Monitoring production MCP server error rates and performance bottlenecks
- Debugging failing tool calls by inspecting full payload arguments and response details directly
- Tracking down bad deployments by splitting performance metrics out by server and client versions
- Correlating AI agent interactions and sessions across complex multi-turn tool calling workflows
Different Plan between Langtail and Spanly
Langtail
$0 / month + VAT
Unlimited users, 2 prompts or assistants, 1,000 logs per month, 30 days data retention, Public sharebable apps
$99 / month + VAT
1 user, 20 prompts or assistants, Unlimited logs, 90 days data retention, Public sharebable apps
$499 / month + VAT
10 users, Unlimited prompts or assistants, Unlimited logs, 1 year data retention, Public sharebable apps, Radars & Alerts, Dedicated support
Custom
Unlimited users, Unlimited prompts or assistants, Unlimited logs, Custom data retention, Public sharebable apps, Radars & Alerts, AI Firewall, Dedicated support, Self hosting
Spanly
$0/mo
100,000 MCP requests included (soft cap with sampling). Includes 30 days data retention, 2 seats, and multi-region ingestion. Designed for teams evaluating Spanly on a single server.
$41/mo
Billed annually at $492. Includes 100,000 MCP requests (overage from $6.00/100k decreasing with volume), 90 days data retention, unlimited seats, up to 10 alert rules, and public dashboards.
$210/mo
Billed annually at $2,520. Includes 100,000 MCP requests (overage from $6.00/100k decreasing with volume), 12 months data retention, unlimited seats, up to 100 alert rules, public dashboards, SAML & OIDC single sign-on, audit logs, and priority support.
$125/mo
Locked for 12 months for the 2026 cohort. Includes 1,000,000 requests, all Business features, a direct Slack Connect channel with the founder, roadmap input, and early access to new features in exchange for a monthly feedback call.
Custom Pricing
For volumes above 30M requests/month. Offers a custom per-request rate below $5.00/100k, dedicated support, and custom retention configurations.
Langtail's traffic
Langtail is the one with 7.5K monthly visits and 00:00:04 Avg.visit duration. Langtail has a Page per visit of 1.47 and a bounce rate of 39.46%.
Visit Over Time
| Monthly Visits | 7.5K |
| Avg·visit Duration | 00:00:04 |
| Page per Visit | 1.47 |
| Bounce Rate | 39.46% |
Spanly's traffic
Spanly is the one with 0 monthly visits and 00:00:00 Avg.visit duration. Spanly has a Page per visit of 0.00 and a bounce rate of 0.00%.
Visit Over Time
| Monthly Visits | 0 |
| Avg·visit Duration | 00:00:00 |
| Page per Visit | 0.00 |
| Bounce Rate | 0.00% |
Geography
The top 5 countries/regions for Langtail are:United States 23.49%, Germany 19.66%, Czech Republic 13.42%, India 11.76%, Brazil 9.02%
Top 5 Countries/regions
 | 23.49% |
 | 19.66% |
 | 13.42% |
 | 11.76% |
 | 9.02% |
Geography
Sorry, there are no data
Traffic Sources
The 6 main sources of traffic to Langtail are:Mail 0, vs_sourcesGenAi 0, Direct 0, vs_sourcesAffiliate 0, Referrals 0, vs_sourcesDisplayAds 0, vs_sourcesSearchPaid 0, vs_sourcesSocialPaid 0, vs_sourcesSearchOrganic 0, vs_sourcesSocialOrganic 0
Mail | 0 |
vs_sourcesGenAi | 0 |
Direct | 0 |
vs_sourcesAffiliate | 0 |
Referrals | 0 |
vs_sourcesDisplayAds | 0 |
vs_sourcesSearchPaid | 0 |
vs_sourcesSocialPaid | 0 |
vs_sourcesSearchOrganic | 0 |
vs_sourcesSocialOrganic | 0 |
Traffic Sources
The 6 main sources of traffic to Spanly are:Mail 0, vs_sourcesGenAi 0, Direct 0, vs_sourcesAffiliate 0, Referrals 0, vs_sourcesDisplayAds 0, vs_sourcesSearchPaid 0, vs_sourcesSocialPaid 0, vs_sourcesSearchOrganic 0, vs_sourcesSocialOrganic 0
Mail | 0 |
vs_sourcesGenAi | 0 |
Direct | 0 |
vs_sourcesAffiliate | 0 |
Referrals | 0 |
vs_sourcesDisplayAds | 0 |
vs_sourcesSearchPaid | 0 |
vs_sourcesSocialPaid | 0 |
vs_sourcesSearchOrganic | 0 |
vs_sourcesSocialOrganic | 0 |
Which is better: Langtail or Spanly?
Langtail might be a bit more popular than Spanly.As you can see, Langtail has 7.5K monthly visits, while Spanly has 0 monthly visits. So more people choose Langtail. So the odds are that people will recommend Langtail more on social platforms.
Langtail has an Avg.visit duration of 00:00:04, while Spanly has an Avg.visit duration of 00:00:00. Also, Langtail has a page per visit of 1.47 and a Bounce Rate of 39.46%. Spanly has a page per visit of 0.00 and a Bounce Rate of 0.00%.
The main users of Langtail are United States, Germany, Czech Republic, India, Brazil, with the following distribution: 23.49%, 19.66%, 13.42%, 11.76%, 9.02%.
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