K-9 Mail

com.fsck.k9
FreeIn-app purchasesEveryone

Key numbers

5M+Installs
3.0 / 1KRating
—Released
Oct 6, 2026Updated

Listing text

K-9 Mail is a 100% open source, privacy focused email client for Android

K-9 Mail is an open source email client that works with basically every email provider.Features* supports multiple accounts* Unified Inbox* privacy-friendly (no tracking whatsoever, only connects to your email provider)* automatic background synchronization or push notifications* local and server-side search* OpenPGP email encryption (PGP/MIME)Install the app "OpenKeychain: Easy PGP" to encrypt/decrypt you…

Get this app from the API

curl -H "X-API-Key: $API_KEY" \
  "https://apiplay.net/api/v1/app?id=com.fsck.k9"
import requests

r = requests.get('https://apiplay.net/api/v1/app', params={'id': 'com.fsck.k9'},
                 headers={'X-API-Key': API_KEY}, timeout=30)
data = r.json()
const res = await fetch('https://apiplay.net/api/v1/app?id=com.fsck.k9', {
  headers: { 'X-API-Key': process.env.API_KEY },
});
const data = await res.json();
$ch = curl_init('https://apiplay.net/api/v1/app?id=com.fsck.k9');
curl_setopt_array($ch, [CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['X-API-Key: ' . getenv('API_KEY')]]);
$data = json_decode(curl_exec($ch), true);

1,000 free credits a month, no card needed. API reference

Screenshots

Fields in the API response

Package namecom.fsck.k9
DeveloperMozilla Thunderbird
Developer websitek9mail.app
CategoryCommunication
Installs (exact)9,532,528
Ratings99,716
Reviews11,062
PriceFree
In-app purchases$5.00 - $200.00 per item
AdsNo
Content ratingEveryone
Current version24.0
Requires Android6.0
Last updateOct 6, 2026
Record refreshedOct 27, 2026

Rating breakdown

534K
411K
39.5K
211K
134K

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