is Settings

A modern Rails engine for blazing-fast, structured application settings.
Up and running in seconds.

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Fino.configure do
  settings do
    setting :api_rate_limit, :integer, default: 1000, description: "Maximum requests"

    section :openai, label: "OpenAI" do
      setting :model, :string, default: "gpt-4o", description: "OpenAI model"
      setting :temperature, :float, default: 0.7, description: "Model temperature"
    end
  end
end


Fino.value(:api_rate_limit)
# => 1000

FINO in Action

Ready-to-Go in Seconds

Install the gem, mount routes, and start using settings instantly. Fully configured in under a minute.

# Add to your Gemfile
gem "fino"

# Mount routes in Rails
Rails.application.routes.draw do
  mount Fino::Engine, at: "/settings"
end

# Use it immediately
Fino.value(:model, at: :openai)
# => "gpt-4o"

Centralized Beautiful UI Control

All your settings organized and documented in a clean, structured interface — no custom dashboard development required.

Instant Settings Access

Settings that fly. In-memory caching and redis backend make reads instant. Preloaded and optimized for high-load apps.

Instant A/B Testing

A/B testing out of the box. Define rollout rules once, apply everywhere. Set percentages, target groups, or values instantly — all in Fino settings.

Scope Overrides

Define different values for different scopes — QA, staging, or even per UserID. Fine-tune settings without touching defaults, perfect for testing or special cases.

Feature Flags without Friction

Turn features on/off in real time across environments. Empower product managers to run experiments safely.

Circuit Breaker Feature Flags

Protect your system automatically: cut off unstable integrations when error rates spike. Fail fast, recover instantly, and keep your core app stable.

if Fino.value(:enabled, at: :some_integration)
  SomeIntegration::ApiClient.new.fetch_data(user_id: id)
else
  raise SomeIntegration::CircuitOpen
end

Dynamic Timeouts

Fix slow integrations instantly: update API timeouts live, no redeploy required. Stabilize services under load without touching ENV files.

Fino.set(timeout: "5000ms", at: :payments)
Fino.set(retry_limit: 3, at: :notifications)

LLM Settings on the Fly

Switch AI models, temperature, or context length instantly — without redeploys, without downtime. Perfect for experimenting in production.

Fino.value(:model, at: :openai)
# => "gpt-4o"

Fino.set(model: "gpt-5", at: :openai)

Fino.value(:model, at: :openai)
# => "gpt-5"

Ready to supercharge your Rails app?

Install FINO today and stop fighting with scattered configs.

Install via Gem →

Speed Matters

Blazing fast access to settings. Optimized for high-load Rails apps.

Flexible Storage

ActiveRecord, Redis, and more — plug & play backends.

Organized by Sections

Group settings into namespaces like Billing, Notifications, or LLM.

Built-in Admin UI

Manage everything through a clean interface. No extra coding required.

Scope Overrides

Set per-scope values for settings — QA, UnityID, or any custom context.

DSL-first configuration

A compact Ruby DSL to declare all your app settings in one readable place.

Speed Matters

Instant access to your settings with aggressive caching and smart preload. Built to thrive under high-load Rails apps.

Flexible Storage

ActiveRecord, Redis, and more — plug & play backends for any environment.

require "fino-redis"

Fino.configure do
  adapter do
    Fino::Redis::Adapter.new(
      Redis.new(**Rails.application.config_for(:redis))
    )
  end

  cache { Fino::Cache::Memory.new(expires_in: 3.seconds) }
end

DSL-first Configuration

Organize sections, defaults, and adapters without boilerplate.

Fino.configure do
  settings do
    section :my_micro_service, label: "My Micro Service" do
      setting :http_read_timeout, :integer, default: 200 # in ms
      setting :http_open_timeout, :integer, default: 100 # in ms
    end
  end
end

Fino.configure do
  settings do
    setting :api_rate_limit, :integer, default: 1000
    section :openai do
      setting :model, :string, default: "gpt-4o"
    end
  end
end

Declare all your app settings in one readable, predictable place.

is Settings

FINO in Action

Ready-to-Go in Seconds

Centralized Beautiful UI Control

Instant Settings Access

Instant A/B Testing

Scope Overrides

Feature Flags without Friction

Circuit Breaker Feature Flags

Dynamic Timeouts

LLM Settings on the Fly

Ready to supercharge your Rails app?

Speed Matters

Flexible Storage

Organized by Sections

Built-in Admin UI

Scope Overrides

DSL-first configuration

Speed Matters

Flexible Storage

DSL-first Configuration

Get Started with

Add the gem

Bundle Install

Mount in Routes

Enjoy & Configure