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About

Use our global network and cloud tools to power your real-time API. You build the endpoints, we’ll make them glow. Keep your existing web stack and let the Fanout Cloud manage persistent client connections. All you have to do is notify us when there is data to send. Scalable — push to a thousand clients or to a million; Fanout's network can handle it. You've got your hands full scaling every other aspect of your application. Let us take this one. Invisible — Use custom domains and data formats or migrate an existing real-time API to the cloud without breaking any of your clients. You own your API. Rest easy with our business-grade SLA, included in all paid accounts. All accounts, including the hacker tier, benefit from SSL by default. A big spike in traffic should be a good thing – not ruin your month. Usage-based pricing without hard limits. We charge by messages and connected client time (not concurrent connections) so you can accurately predict your costs.

About

Spanlens is an open-source (MIT) LLM observability platform that lets developers monitor every call their application makes to OpenAI, Anthropic, Gemini, Mistral, OpenRouter, Azure OpenAI, or a local Ollama model. Integration takes one line: swap your client's baseURL to the Spanlens proxy, or run "npx @spanlens/cli init" and the wizard rewrites your code automatically. From that moment, every request is recorded with its model, token counts, latency, cost, and full prompt and response body, with streaming responses reconstructed automatically. The dashboard turns that raw log into operational insight. Cost tracking breaks spend down per request, per model, and per end user, and parses prompt-cache tokens separately so you see real cache savings rather than sticker price. Agent tracing visualizes multi-step workflows as Gantt waterfalls and node-and-edge graphs, highlighting the critical path so you can find the slowest dependency chain in a fan-out.

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Platforms Supported

Windows
Mac
Linux
Cloud
On-Premises
iPhone
iPad
Android
Chromebook

Audience

Businesses or individuals looking for a global network and cloud tools to power their real-time API

Audience

Open-source LLM observability: log cost, latency, tokens, and agent traces for every OpenAI

Support

Phone Support
24/7 Live Support
Online

Support

Phone Support
24/7 Live Support
Online

API

Offers API

API

Offers API

Screenshots and Videos

Screenshots and Videos

No images available

Pricing

$25 per month
Free Version
Free Trial

Pricing

No information available.
Free Version
Free Trial

Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

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Reviews/Ratings

Overall 0.0 / 5
ease 0.0 / 5
features 0.0 / 5
design 0.0 / 5
support 0.0 / 5

This software hasn't been reviewed yet. Be the first to provide a review:

Review this Software

Training

Documentation
Webinars
Live Online
In Person

Training

Documentation
Webinars
Live Online
In Person

Company Information

Fastly
Founded: 2011
United States
fanout.io/cloud/

Company Information

Spanlens
Founded: 2026
South Korea
spanlens.io

Alternatives

Alternatives

Nodeshub

Nodeshub

Senuto

Categories

Categories

Application Development Features

Access Controls/Permissions
Code Assistance
Code Refactoring
Collaboration Tools
Compatibility Testing
Data Modeling
Debugging
Deployment Management
Graphical User Interface
Mobile Development
No-Code
Reporting/Analytics
Software Development
Source Control
Testing Management
Version Control
Web App Development

Integrations

Fastly

Integrations

Fastly
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