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Duplicate Killer – Prevent Duplicate Form Submissions

v1.7.8

by NIA · updated 6 days ago

Prevent duplicate form submissions by email, phone or text. Supports Contact Form 7, Elementor Forms, Forminator, WPForms Lite and more.

contact form 7duplicate-orderselementor formsforminatorwoocommerce
WordPress.org SaveAnalyze reviews Track this plugin
Rank
#6,186
Up1 vs yesterday
Active installs (est.)
≈ 1,360
1K+ reported · High
Total downloads
35.1K
35,080 all-time
Rating
5.0/5
3 reviews
Support resolved
–
0 of 0 threads, last 2 months
Growing·Downloads +60.5% (30d)·Toward 2K+ · ETA ~24d

Duplicate Killer at a glance

Duplicate Killer is a WordPress plugin by NIA with 1K+ active installs, the #6,186 most popular plugin on WordPress.org. On a typical day it’s downloaded about 71 times, 61% more than the month before. It’s rated 5.0 out of 5 from 3 reviews. Version 1.7.8 came out on Nov 2, 2026 and is tested up to WordPress 7.1.4. It leads the 3 plugins tagged “duplicate-orders”. It was first released in 2022.

Chart time range

Applies to every chart below. History from Oct 10, 2026, 30 days.

Showing the last 30 days. Full history comes with any paid plan.See plans

Downloads over time

Download stats

3K downloads · the last 30 days

Downloads over time
Duplicate Killer Compare series
Downloads over time: 26 days across 1 series.0200400Oct 10Oct 14Oct 18Oct 23Oct 27Oct 31Nov 4Oct 29, 2026: Tested up to 7.1.4
View as table
DateDuplicate Killer
Nov 4, 202675
Nov 3, 2026484
Nov 2, 2026102
Nov 1, 202629
Oct 31, 202632
Oct 30, 202640
Oct 29, 202665
Oct 28, 202671
Oct 27, 202665
Oct 26, 2026415
Oct 25, 2026103
Oct 24, 202646
Oct 23, 202670
Oct 22, 2026412
Oct 21, 2026112
Oct 20, 202638
Oct 19, 202650
Oct 18, 202632
Oct 17, 202640
Oct 16, 202653
Oct 15, 2026275
Oct 14, 2026189
Oct 13, 202641
Oct 12, 202649
Oct 11, 202631
Oct 10, 202647

Unusual spikes are usually updates, not new installs.

Estimated installs

≈ 1,359 · -10.0% in the last 30 days

Estimated installs
Estimated installs: 12 days across 1 series.1.4K1.4K1.5K1.5KOct 27Oct 29Oct 31Nov 2Nov 4Nov 8Oct 29, 2026: Tested up to 7.1.4
View as table
DateEstimated installs
Nov 8, 20261,359
Nov 7, 20261,356
Nov 5, 20261,371
Nov 4, 20261,375
Nov 3, 20261,387
Nov 2, 20261,405
Nov 1, 20261,413
Oct 31, 20261,414
Oct 30, 20261,427
Oct 29, 20261,420
Oct 28, 20261,412
Oct 27, 20261,510

Rank over time

#6,186 · down 190 in the last 30 days

Popular rank
Popular rank: 14 days across 1 series.#6K#6.1K#6.2KOct 27Oct 29Oct 31Nov 2Nov 5Nov 7Nov 9Oct 29, 2026: Tested up to 7.1.4
View as table
DateDaily snapshot
Nov 9, 2026#6,186
Nov 8, 2026#6,187
Nov 7, 2026#6,201
Nov 6, 2026#6,184
Nov 5, 2026#6,164
Nov 4, 2026#6,160
Nov 3, 2026#6,118
Nov 2, 2026#6,035
Nov 1, 2026#6,004
Oct 31, 2026#5,992
Oct 30, 2026#5,976
Oct 29, 2026#5,977
Oct 28, 2026#6,003
Oct 27, 2026#5,996

Growth %

Average -0.87% a day in the last 30 days

Growth %, day over day
Growth %, day over day: 11 days across 1 series.-5%0%5%Oct 28Oct 30Nov 1Nov 4Nov 8
View as table
DateGrowth
Nov 8, 2026+0.22%
Nov 7, 2026-0.55%
Nov 5, 2026-0.29%
Nov 4, 2026-0.86%
Nov 3, 2026-1.28%
Nov 2, 2026-0.57%
Nov 1, 2026-0.07%
Oct 31, 2026-0.91%
Oct 30, 2026+0.49%
Oct 29, 2026+0.57%
Oct 28, 2026-6.49%

Active installs band

1K+ on WordPress.org

Active installs (rounded band)
Active installs (rounded band): 14 days across 1 series.9501K1.1KOct 27Oct 29Oct 31Nov 2Nov 5Nov 7Nov 9Oct 29, 2026: Tested up to 7.1.4
View as table
DateDaily snapshot
Nov 9, 20261K+
Nov 8, 20261K+
Nov 7, 20261K+
Nov 6, 20261K+
Nov 5, 20261K+
Nov 4, 20261K+
Nov 3, 20261K+
Nov 2, 20261K+
Nov 1, 20261K+
Oct 31, 20261K+
Oct 30, 20261K+
Oct 29, 20261K+
Oct 28, 20261K+
Oct 27, 20261K+

Search rankings

Where it appears in WordPress.org search for the searches you track, checked every day.

See where Duplicate Killer ranks in search

Track this plugin to check its position for the searches you choose, daily, with an alert when it moves.

Track this plugin

Change log

From our daily snapshot of WordPress.org
  1. So far:Rank #6035 → #6186
    • Released 1.7.8 (was 1.7.7)
  2. Rank #6003 → #6164
    • Tested up to 7.1.3 → 7.1.4

Versions in use

Share of active installs on each published version, from WordPress.org.

  • v1.748%
  • v1.615%
  • v1.312%
  • v1.19.9%
  • Other16%

Rating trend

5.0★★★★★3 reviews · steady in the last 30 days

Requirements & info

Version history
Version
1.7.8
Requires WordPress
5.3
Tested up to
7.1.4
Requires PHP
5.6.20
First released
Oct 7, 2022
Last updated
Nov 2, 2026
Releases, last 12 months
…

Questions about Duplicate Killer

How many websites use Duplicate Killer?

Duplicate Killer is active on 1K+ WordPress sites, as WordPress.org reports it. WordPress.org rounds the number down, so the real count is somewhat higher. That makes it the #6,186 most popular plugin on WordPress.org.

How many times has Duplicate Killer been downloaded?

35,080 times in total since 2022. On a typical day it’s downloaded about 71 times. See download stats

When was Duplicate Killer last updated?

Version 1.7.8 came out on Nov 2, 2026 (6 days ago). See every release

Is Duplicate Killer compatible with the latest WordPress?

Yes. It’s tested up to WordPress 7.1.4, the current version.

Does Duplicate Killer have known security vulnerabilities?

No. WPVulnerability’s database lists no known vulnerabilities for Duplicate Killer. See its security record

Is Duplicate Killer still maintained?

Yes. Its last release was 6 days ago. No support threads were opened in the last two months.

What rating does Duplicate Killer have?

5.0 out of 5 from 3 reviews on WordPress.org.

What are the best alternatives to Duplicate Killer?

The plugins most like Duplicate Killer, by the tags they share, are Database Addon for Contact Form 7 (600K+), ReCaptcha v2 for Contact Form 7 (200K+) and Redirection for Contact Form 7 (200K+). Compare all alternatives

Latest reviews

Analyze reviews
All reviews on WordPress.org

Review stats

5.0

★★★★★

3 reviews

  • 5 stars: 3 reviews, 100%
  • 4 stars: 0 reviews, 0%
  • 3 stars: 0 reviews, 0%
  • 2 stars: 0 reviews, 0%
  • 1 stars: 0 reviews, 0%
Positive
100%4–5★
Mixed
0%3★
Critical
0%1–2★

Compare with competitors

Add up to 1 competitor. No account needed.

Starter · 1 competitor
Duplicate Killer
Suggested:
Metric
Duplicate Killer
Estimated installs≈ 1,360
Reported installs1K+
Rating5.0
Reviews3
Total downloads35.1K
AuthorNIA
First releasedOct 7, 2022
Version1.7.8
Requires WP5.3
Requires PHP5.6.20
Last updatedNov 2, 2026

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Side by side:Duplicate Killer vs Database Addon for Contact Form 7Duplicate Killer vs ReCaptcha v2 for Contact Form 7Duplicate Killer vs Redirection for Contact Form 7

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