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What is Spanlens?

Spanlens is an open-source observability tool under the MIT license that allows developers to seamlessly monitor their applications' interactions with various services, including OpenAI, Anthropic, and others. The integration is remarkably straightforward; developers can either modify the client's baseURL to point to the Spanlens proxy with a single line of code or use the command "npx @spanlens/cli init," which activates a wizard for automatic code adjustments. After integration, the platform logs all requests in detail, tracking essential metrics such as model type, token counts, latency, costs, and the entire prompt and response body, while also effectively reconstructing streaming outputs. The platform's dashboard converts this extensive log information into valuable operational insights. With cost tracking capabilities, users can analyze their spending by specific requests, models, and users, along with differentiating prompt-cache tokens to clarify actual savings beyond total costs. Furthermore, agent tracing illustrates multi-step workflows through Gantt waterfalls and node-and-edge graphs, highlighting critical paths to help developers identify the slowest dependencies in complex scenarios. This thorough approach not only improves visibility but also equips users with the tools necessary to refine their model interactions for enhanced efficiency and effective cost management, fostering a more productive development environment overall.

What is OpenRouter?

OpenRouter provides a centralized API layer for accessing and managing AI models from a wide range of developers and infrastructure providers. Instead of building a separate integration for each model company, developers can use one interface to send requests to hundreds of available models. Its catalog includes offerings from OpenAI, Anthropic, Google, Meta, xAI, Mistral, DeepSeek, Qwen, Microsoft, NVIDIA, Amazon, and other AI providers. The platform can handle multimodal applications that work with text, images, audio, and video. Users fund a common credit balance that can be applied across supported models and providers without subscribing individually to each service. OpenRouter includes intelligent provider routing that can optimize requests according to pricing, response speed, and endpoint availability. Automatic fallback capabilities allow traffic to move between providers when an endpoint encounters reliability or uptime issues. Companies can also establish detailed data policies to control where prompts are processed and limit requests to providers that meet their privacy requirements. Model discovery tools, rankings, benchmarks, pricing information, and usage statistics help developers compare options before choosing models for particular workloads. OpenRouter supports an OpenAI-compatible API along with developer documentation, making it relatively straightforward to integrate into applications already built around common AI API conventions. The service is designed to simplify model experimentation and production deployment while giving teams greater flexibility over which models, providers, and routing strategies they use.

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Integrations Supported

Activepieces
Apollo
Claude Sonnet 3.5
Cline
Constellation Gate AI
GLM-4.6
GPT-4o
GPT-5.4
GPT-5.4 Pro
Grok 4.20
Hermes Agent
Kilo Code
LFM2
Laguna S 2.1
Ling 3.0 Tiny
Llama 3.1
MindMac
Nelly
Seed2.1 Pro
ZGI

Integrations Supported

Activepieces
Apollo
Claude Sonnet 3.5
Cline
Constellation Gate AI
GLM-4.6
GPT-4o
GPT-5.4
GPT-5.4 Pro
Grok 4.20
Hermes Agent
Kilo Code
LFM2
Laguna S 2.1
Ling 3.0 Tiny
Llama 3.1
MindMac
Nelly
Seed2.1 Pro
ZGI

API Availability

Has API

API Availability

Has API

Pricing Information

Pricing not provided
Free Version
Free Trial Offered?

Pricing Information

Free
Pay-as-you-go (5.5%) and Enterprise plans available
Free Version
Free Trial Offered?

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Supported Platforms

SaaS
Android
iPhone
iPad
Windows
Mac
On-Prem
Chromebook
Linux

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Customer Service / Support

Standard Support
24 Hour Support
Web-Based Support

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Training Options

Documentation Hub
Webinars
Online Training
On-Site Training

Company Facts

Organization Name

Spanlens

Date Founded

2026

Company Location

South Korea

Company Website

spanlens.io

Company Facts

Organization Name

OpenRouter

Date Founded

2023

Company Location

United States

Company Website

openrouter.ai/

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