CF-Predictor

This extension predicts rating changes for Codeforces. It shows approximate deltas during and after the contest.

CF-Predictor is a handy Chrome extension designed for competitive programmers on Codeforces. It modifies the contest standings page to display approximate rating changes for every participant, both during and after contests. This real-time insight helps reduce the anxiety of waiting for official rating updates by providing immediate feedback on your expected rating delta.

By integrating seamlessly with Codeforces, CF-Predictor offers a unique way to visualize your performance and anticipate your rating changes, empowering you to track your progress more effectively and keep your competitive edge sharp.

By:
Wsl_F
Users:
50,000
Rating:
4.19
(165)
Version:
1.3.2 Last updated: 2022-11-28
Creation date:
2020-06-16
Risk:
Low risk impact Very low risk likelihood
Host permissions:
  • https://cf-predictor.wasylf.xyz/
Size:
87.00K
Email:
Wa*****@gmail.com
Full description:
See detailed description
Source:
Chrome Web Store
Updated:
a day ago

Other platforms

CF-Predictor (v1.3.2)
1,315 4.71 (45)

User reviews

CF-Predictor is appreciated by users for providing approximate and often accurate rating predictions that help in anticipating contest results. Many users find it very useful and commend the developer. However, a significant number of reviews report that the extension frequently stops working, often showing only generic good luck messages and failing to give meaningful predictions. Additionally, some users note that the rating predictions are approximate and can sometimes deviate considerably from actual results. Overall, while it is a helpful tool, stability and accuracy issues affect its usability.
Pros
  • Provides approximate rating predictions that can be very close to actual contest ratings.
  • Users find it useful and appreciate its functionality when it works.
  • Recognized as an amazing and accurate tool for rating predictions by some users.
  • Gets kudos and thanks from users who experienced its positive features.
Cons
  • The extension frequently stops working or doesn't function as expected for extended periods.
  • Output sometimes shows only generic messages like "Good luck & high rating!" instead of detailed predictions.
  • Rating predictions are approximate and can sometimes be significantly off (e.g., 10-15% less than actual ratings).
  • No recent updates or fixes noted despite multiple user complaints about non-functionality.
Recent reviews
not working
by SO*****, 2025-02-10

not working
by Fi*****, 2025-01-26

not working
by Ta*****, 2024-11-17
View all user reviews ›

Extension safety

Risk impact

CF-Predictor requires very minimum permissions.

Risk impact analysis details
  • High Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
  • Low ******* ****** ** *** ********* ******** ********************
Risk likelihood

CF-Predictor has earned a good reputation and can be trusted.

Risk likelihood analysis details
  • High This extension has low user count. Unpopular extensions may not be stable or safe.
  • Low **** ********* *** ******* **** **** * ****** **** ***** ******** *** **** ****** ** ** ****** *** *****
  • Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
  • Good **** ********* ** ****** ** ********
  • Good **** ********* *** **** **** *******
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