Comparison

StopTheScript vs Unit Conversion for Safari

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

Head to head
About

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.

Highlights
  • Blocks all JavaScript
  • Stops inline JavaScript
  • Stops external JavaScript
  • Safari extension
  • Supports iOS, iPadOS, macOS
Features
Read full description

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

About

Unit Conversion for Safari

Features
Read full description

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

StopTheScript4 screens
Unit Conversion for Safari4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

UpkeepUpdate frequency

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.

Scorecard1 real difference · 9 level
StopTheScript versus Unit Conversion for Safari: the parameters behind the verdict, then further details
ParameterStopTheScriptUnit Conversion for Safari
Price$5.99$1.99 — better
Rating4.5 (31 ratings) — better—
Positive reviews70.5% of reviews—
Number of ratings31 — better—
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size4 MB4 MB
Age rating4+4+
DeveloperJeff JohnsonSeiya.k

In-app purchases

None

StopTheScript

No in-app purchases

None

Unit Conversion for Safari

No in-app purchases

Questions

Is StopTheScript free?
StopTheScript costs $5.99, with no in-app purchases.
Is Unit Conversion for Safari free?
Unit Conversion for Safari costs $1.99, with no in-app purchases.
Do StopTheScript or Unit Conversion for Safari have ads?
Neither StopTheScript nor Unit Conversion for Safari shows ads.
Which is updated more often, StopTheScript or Unit Conversion for Safari?
StopTheScript ships an update every 4 months, and Unit Conversion for Safari every 2 months. Most recently, StopTheScript was updated on October 9, 2026 and Unit Conversion for Safari on September 22, 2026.

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