---
title: "AtCoder Unit Test – Chrome extension stats, history and permissions"
description: "810 users, rated 5.00 by 1 person. Version 3.1.0, updated 2024-03-19. Requests 3 permissions."
url: "https://extensiontracker.com/extension/lmahhninbclefepjbcdfbcjnancipfmi"
---

# AtCoder Unit Test

Live in the Chrome Web Store.

- Users: 810
- Rating: 5.00 from 1 rating
- Last checked: 2026-09-27 05:08 UTC
- Users gained in 7 days: – (needs a week of history)
- Users gained in 30 days: – (needs a month of history)
- Rank by users: #27,149 of 264,702 live extensions
- Rank in Developer Tools: #2,361 of 27,615

## The listing

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

Summary from the listing:

> Generate unit tests from AtCoder's problem page.

- Extension ID: `lmahhninbclefepjbcdfbcjnancipfmi`
- Developer: [YujiSoftware](https://extensiontracker.com/developer/u3cf0670de47da8a9af3c9c59e5c1d7f1)
- Category: [Productivity › Developer Tools](https://extensiontracker.com/category/productivity/developer)
- First published: 2016-04-16
- Last updated: 2024-03-19
- Version: `3.1.0`
- Size: 2.38 MiB
- Minimum Chrome: 88
- Languages (2): English, 日本語
- Chrome Web Store: <https://chromewebstore.google.com/detail/atcoder-unit-test/lmahhninbclefepjbcdfbcjnancipfmi>
- View the code or download the CRX, in CRX Peek: <https://crxpeek.com/?id=lmahhninbclefepjbcdfbcjnancipfmi>

## Users over time

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

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-09-27 | 810 | 5.00 | 1 |

## What changed

Every change found on a check, newest first.

No changes found since tracking began on 2026-09-27.

## What it can access

From the extension's manifest, in plain language.

### Sites

- `*://atcoder.jp/contests/*/tasks/*`: atcoder.jp

### Sites where it runs scripts

- `*://atcoder.jp/contests/*/tasks/*`: atcoder.jp

### Browser features

- `clipboardWrite`: Change what's in your clipboard
- `storage`: Save settings and data in your browser

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [Copy text with Alt-Click](https://extensiontracker.com/extension/obhagoegpnbklgknnmbglghkfdidegkl) | 10,000 | 3.93 | 82 | Workflow & Planning |
| [Kindle bookshelf exporter](https://extensiontracker.com/extension/olimpmeljimffgjonlpmiaebaonnegdp) | 2,000 | 4.17 | 6 | Workflow & Planning |
| [JavaAPI (Javadoc) Redirector](https://extensiontracker.com/extension/kildmhgekjfidnaohdmopdcoibigchkj) | 889 | 5.00 | 2 | Developer Tools |
| [Phishing Alert](https://extensiontracker.com/extension/kegljohlmicgajfgfpkolnfmbcelkbca) | 12 | – | – | Privacy & Security |

All 5 extensions by [YujiSoftware](https://extensiontracker.com/developer/u3cf0670de47da8a9af3c9c59e5c1d7f1).

## About this data

Collected from the extension's public Chrome Web Store listing. It's checked every month, and again whenever a new version appears. Last checked 2026-09-27 05:08 UTC; next check around 2026-10-01.

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

## Cite this page

Extension Tracker. “AtCoder Unit Test” (lmahhninbclefepjbcdfbcjnancipfmi). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/lmahhninbclefepjbcdfbcjnancipfmi. Accessed 2026-09-28.

```bibtex
@misc{extensiontracker_lmahhninbclefepjbcdfbcjnancipfmi,
  title   = {AtCoder Unit Test (lmahhninbclefepjbcdfbcjnancipfmi)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/lmahhninbclefepjbcdfbcjnancipfmi},
  urldate = {2026-09-28}
}
```

---

From Extension Tracker, a public record of the Chrome Web Store: <https://extensiontracker.com/extension/lmahhninbclefepjbcdfbcjnancipfmi>. 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`.