Comparison

Run Custom JS on Background vs ClauseCheck

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

Head to head
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

ClauseCheck

Features
Read full description

ClauseCheck — Compare Contracts Side by Side ClauseCheck lets you compare two contract documents and instantly see every difference, paragraph by paragraph, character by character — all on your device, completely offline. HOW IT WORKS 1. Pick two PDFs or two Word (.docx) files 2. ClauseCheck extracts and aligns the text 3. Review changes in a clean side-by-side view 4. Export a highlighted PDF report and share it KEY FEATURES • Paragraph-level diff with inline character highlighting See exactly which words changed — not just which paragraphs differ. Deletions are shown in red strikethrough, additions in green. • Two view modes "All" shows the full document with changes marked. "Changes Only" hides unchanged paragraphs so you focus on what matters. • Scanned PDF support (NEW in 1.1) No text layer? No problem. Built-in OCR extracts text from scanned PDFs using Apple's Vision framework — entirely on device. • Word document support Compare .docx files with clean paragraph-level accuracy. • PDF export with highlights Generate a professional comparison report with red/green highlighting that prints correctly. Share it directly via the system share sheet. • History Every comparison is saved automatically. Reopen, share, or delete past reports at any time. • Face ID / Touch ID lock Keep your contract comparisons private with biometric protection. • Works with PDF and Word (.docx) Compare PDF vs PDF, or Word vs Word. Both formats supported. PRIVACY FIRST All processing happens locally on your device. No documents are ever uploaded to a server. No account required. No internet needed. From the maker of JianBox, VoxSafe & CalMerge.

Screenshots

Run Custom JS on Background3 screens
ClauseCheck4 screens

Verdict

The call

The clearest difference is update cadence: ClauseCheck at every 6 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, ClauseCheck every 6 days. The most recent releases landed on September 11, 2026 and September 18, 2026 respectively.

Scorecard1 real difference · 5 level
Run Custom JS on Background versus ClauseCheck: the parameters behind the verdict, then further details
ParameterRun Custom JS on BackgroundClauseCheck
PriceFreeFree
Update frequencyEvery 4 monthsEvery 6 days — better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad — betteriPhone
Requires iOS17.617.0 — better
Further details — not scored
Size1 MB31 MB
Age rating4+4+
DeveloperTakada Hiroki涛 刘

In-app purchases

None

Run Custom JS on Background

No in-app purchases

None

ClauseCheck

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 ClauseCheck free?
ClauseCheck is free to download, with no in-app purchases.
Do Run Custom JS on Background or ClauseCheck have ads?
Neither Run Custom JS on Background nor ClauseCheck shows ads.
Which is updated more often, Run Custom JS on Background or ClauseCheck?
Run Custom JS on Background ships an update every 4 months, and ClauseCheck every 6 days. Most recently, Run Custom JS on Background was updated on September 11, 2026 and ClauseCheck on September 18, 2026.

Other comparisons