Recover 20+ GB from your
Mac in minutes

Without touching anything you actually need.

Nerion visualizes your storage as an interactive treemap, finds what's wasting space, and helps you clean it up safely.

Download for Mac

See features

Free No account Privacy first

Nerion

Library 42.3 GB

Downloads 18.1 GB

Documents 4.2 GB

Developer 11.7 GB

Xcode 8.5 GB

Features

Everything you need to reclaim your storage

Treemap Visualization

See your entire filesystem as an interactive treemap. Larger squares mean more space, spot storage hogs instantly.

Smart Clean Premium

AI-curated list of caches, logs, and app leftovers that are safe to delete. Review before removing, no surprises.

AI Analysis Premium

Get plain-English explanations of what each file is and whether it's safe to delete. Powered by cloud AI out of the box, no setup required. Prefer local? Switch to Ollama in Settings.

Background Scans Premium

Schedule recurring scans that run quietly in the background. Get a notification when there's space to reclaim, click to review instantly.

Quick Scan

Not scanning your entire drive? Quick Scan targets Caches, Logs, Developer folders, and Containers - the usual suspects, in seconds.

Dev Dependency Detection

Automatically flags node_modules and other dev dependency folders. Rebuild anytime, safely remove when not in use.

Smart Clean

Clean confidently,
not blindly

Nerion scans for leftover app data, caches, support files, and logs from apps you've uninstalled or rarely use. Everything is shown in a clear review list before anything is deleted.

Detects orphaned app support files and caches
Never touches critical system files
Review every item before deleting, always in control

Smart Clean 4 items · 3.2 GB

Xcode Derived Data Caches

~/Library/Developer/Xcode/DerivedData

2.1 GB

Simulator Runtimes Developer

~/Library/Developer/CoreSimulator

840 MB

Unused App Caches Caches

~/Library/Caches

280 MB

2 selected · 2.9 GB

AI Analysis Cloud AI

node_modules · 1.2 GB

This is a Node.js dependency folder for a project at ~/Projects/my-app. It contains all npm packages required to run the app locally. It's safe to delete - running npm install will restore it.

AI Analysis · Premium

Understand before
you delete

Select any file or folder and get a plain-English explanation of what it is and whether it's safe to remove. Cloud AI works instantly with no setup. Prefer to keep everything on-device? Switch to local AI via Ollama in one click.

Cloud AI - works out of the box, no configuration needed.
Local AI - runs 100% on your Mac via Ollama. No data ever leaves your device.

Pricing

Start free, upgrade when ready

The core disk scanner is always free. Premium unlocks smart cleanup and automation.

Free

Forever free

Treemap visualization
Quick & Deep scan
Dev dependency detection
15 file deletions/month from app

Download

Best Value

Lifetime

$25

Just $5/mo for 5 months, then yours forever

Pay once, use forever

All Premium features
Pay once, own forever
Equivalent to just 5 months of Premium
All future updates included

Buy Lifetime

Premium Monthly

$5/mo

Billed monthly

Everything in Free
Smart Clean
Background scans
AI analysis (cloud & local)
Unlimited delete from app
Custom Quick Scan folders

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Getting Started

How to open Nerion

Nerion is not yet notarized with Apple, so macOS will ask you to confirm before opening it for the first time. It only takes a few seconds.

Open Nerion

Double-click the app after installing. macOS will show a security warning saying it cannot be opened. Click Done, do not click "Move to Trash".

Open Privacy & Security

Go to System Settings → Privacy & Security and scroll down until you see a notice about Nerion being blocked.

Click "Open Anyway"

Next to the Nerion entry, click Open Anyway. macOS will ask you to confirm with your password or Touch ID.

Authenticate & launch

Enter your Mac password or use Touch ID. Nerion will open and you're all set, you won't need to do this again.

This prompt only appears on first launch. macOS requires it for apps distributed outside the App Store.

Reclaim your disk space today

Free to download. Apple Silicon and Intel Mac.