StopTheScript vs Unit Conversion for Safari
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
StopTheScript
This Safari extension for iOS, iPadOS, and macOS blocks all JavaScript on selected websites. It effectively stops both inline and externally loaded JavaScript, offering more comprehensive control than standard content blockers.
- Blocks all JavaScript
- Stops inline JavaScript
- Stops external JavaScript
- Safari extension
- Supports iOS, iPadOS, macOS
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StopTheScript is a Safari extension for iOS, iPadOS, and macOS that stops all JavaScript on your selected websites. StopTheScript is the only Safari extension that stops inline JavaScript on the web page as well as externally loaded JavaScript. This is in contrast to Safari content blockers, which can only block external JavaScript, not inline JavaScript. StopTheScript is made by indie developer Jeff Johnson. If you need support, please email me at stopthescript@underpassapp.com or read the support site at https://underpassapp.com/StopTheScript/support.html
Unit Conversion for Safari
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Smart Unit Converter for Safari automatically detects measurements on web pages and converts them instantly while you browse. When reading international websites, you often see unfamiliar units such as Fahrenheit, miles, inches, pounds, or gallons. This extension detects those values directly on the page and displays the converted result next to them so you can understand measurements immediately. Unlike traditional unit converter apps, Smart Unit Converter works directly inside Safari. You do not need to copy values or search for conversions. Everything appears automatically while you browse. The extension supports bidirectional conversion between metric and imperial units. Whether a page uses Fahrenheit or Celsius, miles or kilometers, pounds or kilograms, both units are displayed so you can instantly understand the measurement. Examples 70°F (≈ 21°C) 25°C (≈ 77°F) 5 miles (≈ 8 km) 10 km (≈ 6.2 mi) 10 lb (≈ 4.5 kg) 1 gallon (≈ 3.78 L) Key Features Automatic unit detection on web pages Bidirectional conversion between metric and imperial units Supports temperature length weight and volume conversions Inline display or hover display modes Click converted values to copy Enable or disable conversion for specific websites Category control for temperature length weight and volume Fast local processing with no external communication Smart Unit Converter for Safari is designed to be lightweight, fast, and privacy friendly. All processing happens locally in your browser with no data collection. The extension supports multiple languages and automatically adapts to your system language. Perfect for reading international articles, shopping online, DIY tutorials, technical documentation, and global news.
Screenshots
Verdict
The clearest difference is price: Unit Conversion for Safari at $1.99 against StopTheScript's $5.99. On update cadence, 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
StopTheScript costs $5.99 and Unit Conversion for Safari $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
StopTheScript ships an update every 4 months, Unit Conversion for Safari every 2 months. The most recent releases landed on October 9, 2026 and September 22, 2026 respectively.
| Parameter | StopTheScript | Unit Conversion for Safari |
|---|---|---|
| Price | $5.99 | $1.99 — better |
| Rating | 4.5 (31 ratings) — better | — |
| Positive reviews | 70.5% of reviews | — |
| Number of ratings | 31 — better | — |
| Update frequency | Every 4 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 4 MB |
| Age rating | 4+ | 4+ |
| Developer | Jeff Johnson | Seiya.k |
In-app purchases
StopTheScript
No in-app purchases
Unit Conversion for Safari
No in-app purchases
Questions
Is StopTheScript free?
Is Unit Conversion for Safari free?
Do StopTheScript or Unit Conversion for Safari have ads?
Which is updated more often, StopTheScript or Unit Conversion for Safari?
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