---
title: "Atcoder Companion – Chrome extension stats, history and permissions"
description: "2,000 users, rated 5.00 by 10 people. Version 0.3.8, updated 2026-09-07. Requests 2 permissions."
url: "https://extensiontracker.com/extension/bflhekmjlbpdlibcmojpikplaldgceec"
---

# Atcoder Companion

Live in the Chrome Web Store.

- Users: 2,000
- Rating: 5.00 from 10 ratings
- Last checked: 2026-09-26 22:21 UTC
- Users gained in 7 days: – (needs a week of history)
- Users gained in 30 days: – (needs a month of history)
- Rank by users: #14,553 of 264,703 live extensions
- Rank in Tools: #3,608 of 103,498

## The listing

What the Chrome Web Store shows, as of the last check.

Summary from the listing:

> Enhance your experience by providing some useful features designed to streamline your workflow and boost your productivity.

- Extension ID: `bflhekmjlbpdlibcmojpikplaldgceec`
- Developer: [conlacda](https://extensiontracker.com/developer/ubb8141ca426a49fa85e7ddd43c3570bd)
- Trader status: Not declared a trader under EU law
- Category: [Productivity › Tools](https://extensiontracker.com/category/productivity/tools)
- First published: 2024-05-07
- Last updated: 2026-09-07
- Version: `0.3.8`
- Size: 134 KiB
- Minimum Chrome: 88
- Languages (1): English
- Chrome Web Store: <https://chromewebstore.google.com/detail/atcoder-companion/bflhekmjlbpdlibcmojpikplaldgceec>
- View the code or download the CRX, in CRX Viewer: <https://robwu.nl/crxviewer/?crx=https%3A%2F%2Fchromewebstore.google.com%2Fdetail%2Fbflhekmjlbpdlibcmojpikplaldgceec>

## Users over time

One row per check, newest first, as shown on the Chrome Web Store.

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-09-26 | 2,000 | 5.00 | 10 |

## What changed

Every change found on a check, newest first.

No changes found since tracking began on 2026-09-26.

## What it can access

From the extension's manifest, in plain language.

### Sites where it runs scripts

- `*://atcoder.jp/*`: atcoder.jp
- `*://atcoder.jp/contests/*/custom_test?submissionId=*&testcase=*&problem=*`: atcoder.jp
- `*://atcoder.jp/contests/*/standings*`: atcoder.jp
- `*://atcoder.jp/contests/*/submissions/*`: atcoder.jp
- `*://atcoder.jp/contests/*/tasks*`: atcoder.jp
- `*://atcoder.jp/contests/*/tasks/*`: atcoder.jp
- `*://atcoder.jp/contests/*/tasks_print`: atcoder.jp

### Browser features

- `storage`: Save settings and data in your browser
- `unlimitedStorage`: Store more data than the usual limit

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every week, because it has 1,000 or more users, and again whenever a new version appears. Last checked 2026-09-26 22:21 UTC; next check around 2026-10-03.

How the data is collected: <https://extensiontracker.com/methodology>.

## Cite this page

Extension Tracker. “Atcoder Companion” (bflhekmjlbpdlibcmojpikplaldgceec). Chrome Web Store data, last checked 2026-09-26. https://extensiontracker.com/extension/bflhekmjlbpdlibcmojpikplaldgceec. Accessed 2026-09-28.

```bibtex
@misc{extensiontracker_bflhekmjlbpdlibcmojpikplaldgceec,
  title   = {Atcoder Companion (bflhekmjlbpdlibcmojpikplaldgceec)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-26},
  url     = {https://extensiontracker.com/extension/bflhekmjlbpdlibcmojpikplaldgceec},
  urldate = {2026-09-28}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/bflhekmjlbpdlibcmojpikplaldgceec>. It isn't affiliated with Google. The data is free to reuse under CC BY 4.0 (<https://creativecommons.org/licenses/by/4.0/>), crediting Extension Tracker. Extension, developer and list pages come as Markdown too: add `format=md` to the address, as in `https://extensiontracker.com/extension/{id}?format=md`.