Run Custom JS on Background vs ProEncryptor
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.
ProEncryptor
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ProEncryptor encrypts your files on this device and nowhere else. No servers, no accounts, no tracking. WHY IT IS FREE The iOS version is completely free, with no in-app purchases and no ads. ProEncryptor's revenue comes from the macOS version — and letting .pe files be opened on more devices is exactly what makes the macOS version worth having. DECRYPTION IS FREE FOREVER Opening a .pe file is free on every platform and in every version, with no limits. If someone sends you an encrypted file, you can always open it. HOW IT WORKS • Pick one file or many from the Files app or iCloud Drive • Choose a password — it is never stored and never uploaded • Encrypt. You get .pe files you can share anywhere • Tap any .pe file in the Files app to come straight back here and decrypt it WHAT IS INSIDE • AES-256-CBC with PKCS#7 padding • HMAC integrity checking (Encrypt-then-MAC) • PBKDF2 key derivation • The same Rust core as the macOS version, so .pe files are byte-for-byte compatible across both platforms PRIVACY • Collects no data • No advertising • No user accounts Encryption and decryption run entirely on this device. Neither your files nor your password ever leave it. BEFORE YOU START Your password cannot be recovered. We do not store it and there is no backdoor. If you forget it, your files can never be opened again — save it in a password manager. Encrypted files can be saved to the ProEncryptor folder in iCloud Drive, the same location the Mac version uses.
Screenshots
Verdict
Run Custom JS on Background and ProEncryptor are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
| Parameter | Run Custom JS on Background | ProEncryptor |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | — |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad — better | iPhone |
| Requires iOS | 17.6 — better | 18.0 |
| Further details — not scored | ||
| Size | 1 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Takada Hiroki | Uniation Software Co.,Ltd. |
In-app purchases
Run Custom JS on Background
No in-app purchases
ProEncryptor
No in-app purchases





