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Chrome extensionwhat they say

MailKing

MailKing: Email Campaigns in Gmail by cloudHQ

Send mass emails directly from Gmail

★★★★☆4.4 (121) · 10k+ users
Free
Website ↗ Chrome Web Store ↗
what mrrlens sees
MRR · Freemium · upsell unknownPrice not published
Opportunity—
Buyer threads · 30 d0
“I set up 14 test mails to my own account and there was always something missing or not merged well.”
#1 complaint · Bugs/Reliability · 2 of 2 complaints read · analysed Oct 30, 2026 · source

01Revenue

Price not publishedFreemium · upsell unknown
Why there is no estimate

MailKing has a paid tier, but the listing publishes no price. Without one, any revenue figure would rest on a guessed price, so MRRLens shows none and leaves revenue out of its opportunity score.

Exploratory math, not an estimate: if it charged a typical price for its marketplace, active users × paid conversion × monthly price would give $250–1k a month. Assumptions: active users: 10k; 0.5%–2.5% of active users pay; no public price: assumed $5.00/month, typical for this marketplace. Methodology.

Store data from the Chrome Web Store listing, refreshed daily. Updated 15 h ago.

02Why users leave MailKing

Bugs/Reliability2 reviews · 2 of 2

14 test emails to own account had missing or poorly merged content; no quick scroll-through preview to verify individual emails.

“I set up 14 test mails to my own account and there was always something missing or not merged well.” source ↗

Sample: 2 recent complaints (1–3★ reviews) · clustered Oct 30, 2026 · complaints from Feb 2024–Apr 2024, none in the last 24 months — history, not today · each review labelled by a model, quotes verbatim

03How to build a better MailKing

Build difficultyMediumGmail API/add-on approval, email deliverability, and anti-spam compliance are main barriers.
Three build ideas that answer these complaintsIncluded in the day pass and Pro.
Unlock

04Who wants a better MailKing

0 buyer threads in the last 30 days name MailKing.

05Questions about MailKing

How much revenue does MailKing make?

MRRLens shows no revenue figure for MailKing. It sells a paid tier but does not publish the price, and an estimate built on an assumed price would be a guess. The exploratory math is on the page, labelled as such.

What do users complain about most in MailKing?

Across 2 recent complaints, the most common is bugs/reliability (2 of 2). 14 test emails to own account had missing or poorly merged content; no quick scroll-through preview to verify individual emails.

What are the best MailKing alternatives?

The closest alternatives MRRLens found are Send Mass Mail + HTML inserter for Gmail and Auto Follow Up for Gmail™ by cloudHQ. The full list, with why users leave, is on the MailKing alternatives page.

How many people use MailKing?

MailKing lists 10k+ users on the Chrome Web Store, rated 4.4 (121).

See the full x-ray of MailKing

Full 1-star breakdown with verbatim quotes, the build blueprint and every live thread — on every product.