# CF-Predictor

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

Canonical page: [https://chrome-stats.com/d/cf-predictor](https://chrome-stats.com/d/cf-predictor)

## Overview

- **ID:** `cf-predictor`
- **Platform:** Firefox
- **Type:** Firefox add-on
- **Status:** Available
- **Publisher:** Wsl\_F
- **Category:** other
- **Daily users:** 986
- **Weekly downloads:** 29
- **Rating:** 4.63 / 5 (46 ratings)
- **Version:** 1.3.2
- **Last updated:** 2022-11-26
- **First published:** 2017-02-13
- **Size:** 91 KB
- **Data as of:** 2026-09-09
- **Store listing:** [Firefox Add-ons Store](https://addons.mozilla.org/firefox/addon/cf-predictor/)

## Description

CF-Predictor is a Chrome extension designed to enhance your competitive programming experience on Codeforces. It modifies the contest standings page to display approximate rating changes for every contestant both during and after contests. This immediate insight helps alleviate the anxiety of waiting for official rating updates by showing likely deltas in real-time. Whether you're a seasoned competitor or a casual participant, CF-Predictor provides valuable foresight into your performance trends.

By integrating seamlessly with Codeforces, CF-Predictor offers a user-friendly way to track rating fluctuations, making contest results more transparent and engaging. Say goodbye to nervous waiting and stay informed about your progress instantly with this handy tool.

## Rankings

- #3,321 — Overall
- #70 — rating
- #121 — wait
- #189 — modify
- #232 — show

## Permissions and access

### Permissions

- `https://cf-predictor.wasylf.xyz/`

### Content script matches

- `codeforces.com`

## Safety

- **Risk impact:** Low risk impact
- **Risk likelihood:** Low risk likelihood

### Analysis details

- Injects scripts into web pages, which may alter or extract site contents, resulting in a substantial risk.
- This extension has low user count. Unpopular extensions may not be stable or safe.

> Some risk analysis details are omitted from this free response. [Upgrade to view the full analysis](https://chrome-stats.com/pricing).

## Review summary

Users find the CF-Predictor Firefox add-on very good and highly useful. Reviewers praise its effectiveness and usefulness, with no reported issues or drawbacks noted in multiple reviews.

### Pros

- Easy to use and very good functionality
- Highly useful plugin that meets user needs

## Similar extensions and apps

- [ccPredictor](https://chrome-stats.com/d/ccpredictor)
- [CCRatingPredictor](https://chrome-stats.com/d/ccratingpredictor)
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- [CF GetRating](https://chrome-stats.com/d/cf-getrating) — 172 users, 5.00 / 5
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- [Codeforces Rating Hider](https://chrome-stats.com/d/codeforces-rating-hider) — 2 users
- [Codeforces Custom Contests](https://chrome-stats.com/d/codeforces-custom-contests) — 27 users, 4.67 / 5

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Source: [Chrome-Stats](https://chrome-stats.com/d/cf-predictor)