Pattern #66: Complementary Upsell

Pattern #66  Tested 8 timesFirst tested by Devesh Khanal Recently tested by Oshri Maidanik on Oct 30, 2026

Based on 8 Tests, Members See How Likely Version B Wins Or Loses And By How Much

LOSSES
-5
-4
-3
-2
-1
FLAT
+1
+2
+3
+4
+5
WINS

Measured by the sum of negative and positive tests.

A B
Complementary Upsell (Variant A) Complementary Upsell (Variant B)

Expected Median Effects Of B

X.X%

Progression

(3 tests)

-

Leads

X.X%

Signups

(2 tests)

-

Engagement

X.X%

Sales

(6 tests)

X.X%

Revenue

(4 tests)

-

Retention

-

Referrals

X.X%

ANY PRIMARY

(8 tests)

All 5 tests meta-analyzed: +X.X% combined effect (p-val X.XXXX)

34.7% of 90% cumulative power target at 2% MDE from 5 tests Help replicate this with an A/B test

90%
↓
4.5% 5.1% 4.3% 7.2% 18.9%
Product 2 tests: X%
Checkout 2 tests: X%
Signup 1 test: X%

Tested on

Tests

Pattern #66: Complementary Upsell
Was Tested by Oshri Maidanik

Test # 678 Oct 30, 2026 Test link

Find Out How It Did With 8,344 Visitors

  • Measured by AOV

  • Measured by completed orders

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Checkout Added Isolated
Statistical Power by Minimum Detectable Effect
5%0.5%
7.8%1%
18.9%2%
77.1%5%
80%5.2%
99.9%10%+

Added

Isolated

In this checkout experiment, an upgrade offer was added directly above the contact and delivery form. Below the express checkout buttons, the variant showed the item already in the cart (a single bottle priced at $28) and invited shoppers to upgrade to a 3-month supply for only $8 more. The bundle was shown at $36 next to a crossed-out $60, with arrows to browse other upgrade options and a prominent “Upgrade” button. As a result, the standard checkout form was pushed further down the page, behind a second “OR” divider. Imact on completed orders was measured.

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The Same Pattern Was Also Tested Here

Test # 566 on Banter.com by Craig KistlerCraig Kistler Dec 11, 2024 Test link

Find Out How It Did With 62,046 Visitors

  • Measured by cart additions

  • Measured by completed sales

  • Measured by Revenue

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Product Replaced Isolated

Replaced

Isolated

In this experiment, a modal based message was shown to encourage extra products being added as complementary upsells. In the control, the promotion text appeared at the bottom as red text ("Buy one, get up to two 50% Off"). Whereas in the variation, specific products were shown on the modal (post add-to-cart). Impact on adds-to-cart, sales and average revenue was measured.

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Test # 545 on Banter.com by Craig KistlerCraig Kistler Jul 29, 2024 Test link

Find Out How It Did With 61,778 Visitors

  • Measured by cart additions

  • Measured by completed sales

  • Measured by revenue

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Product Replaced Isolated

Replaced

Isolated

In this experiment, a modal based message was shown to encourage extra products being added as complementary upsells. In the control, the promotion text appeared at the bottom as red text ("Buy one, get up to two 50% Off"). Whereas in the variation, specific products were shown on the modal (post add-to-cart). Impact on adds-to-cart, sales and average revenue was measured.

Get Access To See The Test Results

Test # 509 on Jared.com by Craig KistlerCraig Kistler Dec 18, 2023 Test link

Find Out How It Did With 407,785 Visitors

  • Measured by adds to cart

  • Measured by completed orders

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Product Added Isolated
Statistical Power by Minimum Detectable Effect
3%0.5%
4.4%1%
7.2%2%
23.2%5%
67.3%10%
80%11.7%
94.4%15%
99.6%20%

Added

Isolated

In this experiment, a protection plan was launched as a modal for customers that clicked add-to-cart without choosing the upsell. Impact on adds-to-cart and sales was measured.

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Test # 434 on Learnwithhomer.c... by Stanley ZuoStanley Zuo Sep 30, 2022 Test link

Find Out How It Did With 6,098 Visitors

  • Measured by total trials

  • Measured by annual trials

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Signup Added Isolated
Statistical Power by Minimum Detectable Effect
3%0.5%
3.3%1%
4.3%2%
8.6%5%
21.5%10%
41.2%15%
63.1%20%
80%24.7%

Added

Isolated

In this experiment, an upsell modal appeared during a signup funnel. In the variation, if users did not select a monthly plan, they were nudged to an annual one. Impact on overall and annual signups was measured.

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Test # 177 by Devesh KhanalDevesh Khanal May 17, 2018 Test link

Find Out How It Did

  • Measured by average order value

Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Shopping Cart Added Isolated

Added

Isolated

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Test # 178 by Devesh KhanalDevesh Khanal May 17, 2018 Test link

Find Out How It Did With 63,410 Visitors

  • Measured by visits to post payment page

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Product Added Isolated
Statistical Power by Minimum Detectable Effect
3%0.5%
3.4%1%
4.5%2%
9.7%5%
25.6%10%
48.9%15%
72.1%20%
80%22.1%

Added

Isolated

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Test # 57 by Jakub LinowskiJakub Linowski Jul 07, 2016 Test link

Find Out How It Did With 6,079 Visitors

  • Measured by visits to thank you page

  • A: XX.X% (XXX successes out of XXX,XXX visitors)
  • B: XX.X% (XXX successes out of XXX,XXX visitors)
Zoom In
Complementary Upsell - Variant A A
Complementary Upsell - Variant B B
Checkout Added Isolated
Statistical Power by Minimum Detectable Effect
3%0.5%
3.6%1%
5.1%2%
12.5%5%
36%10%
66.2%15%
80%17.8%
88.1%20%

Added

Isolated

Get Access To See The Test Results

For each pattern, we measure three key data points derived from related tests:

REPEATABILITY - this is a measure of how often a given pattern has generated a positive or negative effect. The higher this number, the more likely the pattern will continue to repeat.

SHALLOW MEDIAN - this is a median effect measured with low intent actions such as initiating the first step of a lengthier process

DEEP MEDIAN - this is derived from the highest intent metrics that we have for a given test such as fully completed signups or sales.