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What is L1M Io?

l1m (pronounced 'el-one-em') is a structured data extraction API that acts as a proxy to extract structured JSON from unstructured text and images using LLMs. Built by an open-source team, it solves the problem of needing complex prompt engineering and multiple API calls to get structured data from LLMs. Core capabilities include a schema-first approach where users define their desired output using JSON Schema, zero prompt engineering required, provider flexibility supporting any OpenAI-compatible or Anthropic provider, built-in caching with configurable TTL, and no data retention by default. It fits developers and teams who need reliable, schema-validated data extraction from raw text or images, such as parsing invoices, menus, or documents. The tool is open-source with a hosted version available, offering a free tier and high availability. Users can bring their own LLM provider or use the managed API, making it suitable for both prototyping and production workflows.

AI Tool Review Summary

Performance Score

4.5/5

Content/Output Quality

High, consistent, and schema-compliant

Interface

Minimal API with clear documentation

AI Technology
LLMNLPComputer Vision
Purpose of Tool

To extract structured JSON data from unstructured text and images using LLMs with a schema-first approach.

Compatibility

Works with any OpenAI-compatible or Anthropic provider, supports local models via Ollama, and offers SDKs for Node.js, Python, and Go.

Pricing

Freemium with free tier (500 requests) and pay-as-you-go standard plan

Features

Features with the highest value for users are highlighted here.

Schema-first JSON extraction

Zero prompt engineering

Multi-provider support (OpenAI, Anthropic)

Built-in caching with TTL

Open-source with hosted option

No data retention

Image and text input support

Official SDKs for Node.js, Python, Go

Who Is It For?

Backend Developers

Data Engineers

AI/ML Engineers

Product Managers

Startups

Enterprise Teams

Open Source Contributors

Image Processing Workflows

Content Aggregators

API Integrators

Pricing

Free

$0/free
  • First 500 requests free
  • All features included
Popular

Standard

$5/monthly
  • 10,000 requests
  • All features included
  • Caching support

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Pros & Cons

Pros

  • Extremely simple API that eliminates prompt engineering.
  • Flexible provider choice and caching reduce costs.

Cons

  • Limited to JSON Schema subset; complex schemas may not work.
  • Dependency on external LLM providers for accuracy.

FAQs

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Reviews

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Rating

5.0

Pros

Cons

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