---
title: "MailView – Gmail Email Tracker, Read Statistics & Proof of Receipt Reports – Chrome extension stats, history and permissions"
description: "25 users, rated 4.17 by 6 people. Version 1.5.0, updated 2026-08-28. Requests 12 permissions."
url: "https://extensiontracker.com/extension/kacoceagfedjpphlnlhbdmhijpnngfco"
---

# MailView – Gmail Email Tracker, Read Statistics & Proof of Receipt Reports

Live in the Chrome Web Store.

- Users: 25
- Rating: 4.17 from 6 ratings
- Last checked: 2026-09-27 04:01 UTC
- Users gained in 7 days: – (needs a week of history)
- Users gained in 30 days: – (needs a month of history)
- Rank by users: #108,986 of 264,703 live extensions
- Rank in Communication: #2,202 of 6,873

## The listing

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

Summary from the listing:

> Track email opens in Gmail with real-time read receipts, open notifications, and proof of receipt — know when your emails are read.

- Extension ID: `kacoceagfedjpphlnlhbdmhijpnngfco`
- Developer: [Onepaper.ai](https://extensiontracker.com/developer/u9e0d65a39308c8ed77dd2dca35184448)
- Category: [Productivity › Communication](https://extensiontracker.com/category/productivity/communication)
- First published: 2026-05-27
- Last updated: 2026-08-28
- Version: `1.5.0`
- Size: 221 KiB
- Minimum Chrome: 88
- Languages (1): English
- Privacy policy: `https://onepaper.ai/privacy-policy`
- Chrome Web Store: <https://chromewebstore.google.com/detail/mailview-%E2%80%93-gmail-email-tr/kacoceagfedjpphlnlhbdmhijpnngfco>
- View the code or download the CRX, in CRX Viewer: <https://robwu.nl/crxviewer/?crx=https%3A%2F%2Fchromewebstore.google.com%2Fdetail%2Fkacoceagfedjpphlnlhbdmhijpnngfco>

## Users over time

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

| Checked | Users | Rating | Ratings |
| --- | ---: | ---: | ---: |
| 2026-09-27 | 25 | 4.17 | 6 |

## 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

- `https://*.run.app/*`: run.app and its subdomains
- `https://identitytoolkit.googleapis.com/*`: identitytoolkit.googleapis.com
- `https://mail.google.com/*`: mail.google.com
- `https://securetoken.googleapis.com/*`: securetoken.googleapis.com
- `https://www.google-analytics.com/*`: www.google-analytics.com
- `https://www.googleapis.com/*`: www.googleapis.com

### Sites where it runs scripts

- `https://mail.google.com/*`: mail.google.com

### Browser features

- `declarativeNetRequest`: Block or change network requests, using rules
- `declarativeNetRequestFeedback`: See which of its network rules matched
- `downloads`: Manage your downloads
- `identity`: Sign you in with your Google account
- `storage`: Save settings and data in your browser
- `tabs`: Read the addresses and titles of your tabs

## More from this developer

Other extensions from the same publisher account.

| Extension | Users | Rating | Ratings | Category |
| --- | ---: | ---: | ---: | --- |
| [MemoryStats – Close Heavy Tabs, Reduce RAM Usage, Boost Chrome Memory Saver](https://extensiontracker.com/extension/bojiipmckkcpkdacjgpabfigbjagonlo) | 2,000 | 5.00 | 20 | Tools |
| [100% Invisible - Tracking Blocker for Gmail \| Ghost Mode](https://extensiontracker.com/extension/ciffinffjkflieahdcnfadfpjehegiag) | 181 | 5.00 | 3 | Workflow & Planning |
| [Email Open Tracker – Unlimited Real-Time Gmail Read Receipts & Tracking](https://extensiontracker.com/extension/mohpkbnjkjfelnfcecbembhiohcmffhl) | 170 | 4.80 | 15 | Communication |
| [Make it Pig — No-Code Web Scraper, Data Extractor & Excel Exporter](https://extensiontracker.com/extension/kdbeidpnnjjocknacggemgibcjfibbbn) | 19 | 5.00 | 1 | Tools |
| [Smart Modern Tab Manager - Organised Browsing](https://extensiontracker.com/extension/bjcbnhapcealdobpfdajjmclcnfhoppc) | 12 | 5.00 | 2 | Functionality & UI |
| [Minimalist Tabs Manager - 1Paper Ai](https://extensiontracker.com/extension/mkkpdbolclkafonhmhcapbcfcofpipdh) | 12 | 5.00 | 2 | Workflow & Planning |

All 7 extensions by [Onepaper.ai](https://extensiontracker.com/developer/u9e0d65a39308c8ed77dd2dca35184448).

## 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 04:01 UTC; next check around 2026-10-12.

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

## Cite this page

Extension Tracker. “MailView – Gmail Email Tracker, Read Statistics & Proof of Receipt Reports” (kacoceagfedjpphlnlhbdmhijpnngfco). Chrome Web Store data, last checked 2026-09-27. https://extensiontracker.com/extension/kacoceagfedjpphlnlhbdmhijpnngfco. Accessed 2026-09-28.

```bibtex
@misc{extensiontracker_kacoceagfedjpphlnlhbdmhijpnngfco,
  title   = {MailView – Gmail Email Tracker, Read Statistics & Proof of Receipt Reports (kacoceagfedjpphlnlhbdmhijpnngfco)},
  author  = {{Extension Tracker}},
  year    = {2026},
  note    = {Chrome Web Store data, last checked 2026-09-27},
  url     = {https://extensiontracker.com/extension/kacoceagfedjpphlnlhbdmhijpnngfco},
  urldate = {2026-09-28}
}
```

---

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