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Userscripts VS PredictMirror

Compare Userscripts VS PredictMirror and see what are their differences

Userscripts

An open-source userscript editor for Safari.

Rating
0 reviews
Alternatives Is it good?
PredictMirror

Practice prediction markets without risking real money with PredictMirror, the best paper trading simulator for Polymarket. Free Extension.

Rating
0 reviews
Alternatives Is it good?
PromptBrake
Automated AI security testing for agents, chatbots, and APIs. Find prompt injection, data leaks, and unsafe behavior before launch. sponsored
Note: These products don't have any matching categories. If you think this is a mistake, please edit the details of one of the products and suggest appropriate categories.

Which is more popular?

Based on our record, Userscripts seems to be more popular. It has been mentioned 14 times since March 2021.

social mentions
14 vs 0
Browser Extensions popularity
100% vs 0%
alternatives listed
18 vs 13

Base details

Website, pricing, platforms and company facts side by side.

Userscripts
PredictMirror
Website github.com predictmirror.com
Platforms —
Google Chrome Vivaldi
Listed in
Browser Extensions Dark Mode Tool Developer Tools +1
Trading Prediction Market Finance Cryptocurrencies Cryptocurrency Trading Crypto Fintech +4

Features and specs

What each product offers, as listed by its team.

Userscripts 5 features
PredictMirror 5 features
  • Customization
    Userscripts allow for extensive customization of web experiences, as users can write scripts in JavaScript to modify the behavior and appearance of websites according to their needs.
  • Enhanced Productivity
    By automating repetitive tasks and adding useful shortcuts, userscripts can significantly enhance productivity for users who interact frequently with specific web applications.
  • Open Source Nature
    Being hosted on GitHub, Userscripts is open source, allowing developers to contribute, review the code for security purposes, and fork the project for personal use.
  • Community Support
    Userscripts have a strong community backing, with many scripts readily available through various online repositories, providing users with a wide array of pre-made scripts to choose from.
  • Cross-Browser Compatibility
    Many userscripts are designed to be cross-browser compatible, functioning in browsers like Chrome, Firefox, and others that support userscript managers like Tampermonkey or Greasemonkey.

Possible disadvantages

  • Security Risks
    Userscripts can pose security risks, as malicious scripts could potentially capture sensitive user data or perform harmful actions on behalf of the user.
  • Maintenance Overhead
    As websites update their structures and functionalities, users may need to frequently maintain or update their scripts to ensure continued compatibility and performance.
  • Technical Barrier
    Creating and managing userscripts often requires a certain level of technical knowledge, particularly in JavaScript, which may not be accessible to non-technical users.
  • Browser Deprecation Concerns
    Future browser updates might deprecate some functionalities that userscripts rely on, potentially rendering some scripts useless unless updated.
  • Performance Impact
    Poorly written or overly complex scripts might lead to performance issues, slowing down browsers or websites as they perform additional processing on pages.
  • Live order book mirror
    Real Polymarket prices, refreshed continuously. Your simulated trades fill at the actual market price, with realistic slippage modeled in.
  • Real-time P&L
    Every position tracks the market live. Sparklines on the portfolio view, full area charts with fill history on the detail view.
  • Win streaks & edge
    Track your win rate, current streak, and the edge you're capturing versus market consensus. Learn what you're actually good at.
  • Open and closed history
    Every paper trade is logged. Filter active versus closed positions, see realized P&L by period, and learn from your wins and losses.
  • Privacy-first by design
    Nothing leaves your browser. No accounts, no servers, no tracking. Your trading data lives in local storage only, and you control it.

Analysis

An editorial look at what each product does well and who it suits.

Userscripts
PredictMirror

No analysis of Userscripts yet.

Overall verdict

  • I don't have verified, up-to-date information about PredictMirror (predictmirror.com), so I can't confirm whether it's legitimate, effective, or trustworthy. I'd recommend independent research before using or paying for this service.

Why this product is good

  • I have no reliable data on this specific website's reputation, ownership, or track record
  • I cannot verify claims about its predictions, accuracy, or business practices
  • There is no independent evidence available to me confirming it is a legitimate, safe, or effective product
  • Unverified prediction or forecasting sites can carry risks including data privacy issues, low accuracy, or financial loss if used for betting/trading decisions

Recommended for

  • Anyone considering this site should first check for verifiable reviews, WHOIS/domain history, and independent user testimonials
  • Users should look for regulatory registration if it involves financial or betting predictions
  • Not recommended to rely on until verified by trusted third-party sources such as consumer protection sites, security scanners (e.g., VirusTotal, Trustpilot), or financial regulators if applicable

Videos

Walkthroughs and reviews on video.

Userscripts 2 videos + Add
PredictMirror 0 videos + Add

5 Recommended Tampermonkey Userscripts in 2022

More videos

  • - Creating TamperMonkey Userscripts | Augmented Browsing

No PredictMirror videos yet. You could help us improve this page by suggesting one.

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100
Userscripts
PredictMirror
100% 100%
Browser Extensions
0% 0%
0% 0%
Trading
100% 100%
100% 100%
Dark Mode
0% 0%
0% 0%
Prediction Market
100% 100%

User comments

Share your experience with using Userscripts and PredictMirror. For example, how are they different and which one is better?

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Social recommendations and mentions

Recommendations tracked on public social media and blogs since March 2021.

Userscripts 14 mentions
PredictMirror 0 mentions
  • Jeffgeerling.com has been Migrated to Hugo
    The looking icon is the Userscripts extensions. https://github.com/quoid/userscripts. - Source: Hacker News / 9 months ago
  • Show HN: My first programming project – userscripts to change forum UIs
    Hi, I'm Will. I'm 24, autistic, and have OCD tendencies. I'm learning to code and this is my first public project. I’d really appreciate your feedback and encouragement! This project lets me solve some of my OCD problems online. There... - Source: Hacker News / over 2 years ago
  • Show HN: HNRelevant – Explore Related Discussions on HN in an Integrated Sidebar
    You can use userscripts [1] which is a safari extension which allows you to add userscripts, and the author of this work have an userscript [2] that you can use with safari (or any other browser) [1] https://github.com/quoid/userscripts. - Source: Hacker News / over 2 years ago

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Tracking PredictMirror since Jun 2026.

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