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.
Run Custom JS on Background
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・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.
ClauseCheck
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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
Verdict
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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
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.
| Parameter | Run Custom JS on Background | ClauseCheck |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 6 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 | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Takada Hiroki | 涛 刘 |
In-app purchases
Run Custom JS on Background
No in-app purchases
ClauseCheck
No in-app purchases





