Comparison

Run Custom JS on Background vs NasScale

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

Run Custom JS on Background

Always run custom JavaScript.

Your NAS, always in hand

Free

🔧 Utilities

No ratingsView app →

About

Run Custom JS on Background

Features

Read full description

・Runs custom JavaScript code continuously in Safari ・Supports a wide range of functions, including automatic bookmarklet execution, ad blocking, and automation. ・Easily paste code using the Paste button ・Supports import and export. You can instantly transfer your settings to other devices.

About

NasScale

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NasScale is an iPhone client for people who own their own NAS. With built-in Tailscale, you can reach Synology NAS devices on your Tailnet without installing a separate Tailscale app—manage files, transfers and downloads, play media remotely, and work with common packages and self-hosted services. What you can do: • Connect to Synology DSM and view system, storage, and package status • Browse and manage files via File Station, SMB, SFTP, or FTP • Upload, download, and preview files, and manage transfer tasks • Play media remotely (AVPlayer first, MPV when needed) • Optionally connect Immich, Jellyfin, and similar self-hosted services • Optionally manage qBittorrent, Aria2, Transmission, and similar download clients

Screenshots

Run Custom JS on Background3 screens

NasScale4 screens

Verdict

The call

The clearest difference is update cadence: NasScale at every 8 days against Run Custom JS on Background's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Run Custom JS on Background ships an update every 4 months, NasScale every 8 days. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

Scorecard1 real difference · 5 level

Run Custom JS on Background versus NasScale: the parameters behind the verdict, then further details
Parameter	Run Custom JS on Background	NasScale
Price	Free	Free
Update frequency	Every 4 months	Every 8 days — better
Ads	No	No
In-app purchases	No	No
Devices	iPhone, iPad — better	iPhone
Requires iOS	17.6	17.0 — better
Further details — not scored
Size	1 MB	68 MB
Age rating	4+	4+
Developer	Takada Hiroki	贺黄

In-app purchases

None

Run Custom JS on Background

No in-app purchases

None

NasScale

No in-app purchases

Questions

Is Run Custom JS on Background free?

Run Custom JS on Background is free to download, with no in-app purchases.

Is NasScale free?

NasScale is free to download, with no in-app purchases.

Do Run Custom JS on Background or NasScale have ads?

Neither Run Custom JS on Background nor NasScale shows ads.

Which is updated more often, Run Custom JS on Background or NasScale?

Run Custom JS on Background ships an update every 4 months, and NasScale every 8 days. Most recently, Run Custom JS on Background was updated on October 16, 2026 and NasScale on October 10, 2026.