86 Tests By Jakub Linowski

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Tests

Test #663 by Jakub LinowskiJakub Linowski Jul 29, 2026 Desktop Mobile X.X% Sales

Jakub Tested Pattern #20: Canned Response

Pattern #20: Canned Response - Variant A
Pattern #20: Canned Response - Variant B

In this experiment, users were able to auto-generate gift messages during the checkout flow based on input fields above. For this reason, the message input area was also shifted further down beyond the initial fields.

Total Sample: 3,838 • Statistical Power at 5% MDE: 84.4%

Test #662 by Jakub LinowskiJakub Linowski Jul 16, 2026 Mobile X.X% Sales

Jakub Tested Pattern #15: Bulleted Reassurances

Pattern #15: Bulleted Reassurances - Variant A
Pattern #15: Bulleted Reassurances - Variant B

In this checkout funnel experiment, instead of showing order details and reassurances in a labeled key-value format (e.g., "Club Length: 6 Months"), they were condensed into an unlabeled bullet list. Media logo badges were also removed. Impact on checkouts and sales was measured.

Total Sample: 2,375 • Statistical Power at 5% MDE: 27.8%

Test #661 by Jakub LinowskiJakub Linowski Jul 08, 2026 Desktop Mobile X.X% Sales

Jakub Tested Pattern #98: Auto Suggest

Pattern #98: Auto Suggest - Variant A
Pattern #98: Auto Suggest - Variant B

In this experiment, instead of utilizing the browser auto-complete for the street address, the Google API call was made using the postal/zip code as the input. Once users would begin typing a street address, a pull-down with matching recommendations would appear. Impact on next step visits (to checkout) and sales were measured.

Total Sample: 9,611 • Statistical Power at 5% MDE: 77%

Test #655 by Jakub LinowskiJakub Linowski Jun 22, 2026 Desktop Mobile X.X% Sales

Jakub Tested Pattern #113: More Or Fewer Plans

Pattern #113: More Or Fewer Plans - Variant A
Pattern #113: More Or Fewer Plans - Variant B

In this experiment, an additional ongoing club was tested in a floating buy box on top of 4 other subscription durations. Impact on adds to cart and sales was measured.

Total Sample: 9,548 • Statistical Power at 5% MDE: 9.1%

Test #654 by Jakub LinowskiJakub Linowski Jun 18, 2026 Desktop Mobile X.X% Sales

Jakub Tested Pattern #11: Gradual Reassurance

Pattern #11: Gradual Reassurance - Variant A
Pattern #11: Gradual Reassurance - Variant B

In this experiment, product configuration options were moved from a floating buy box on the right, to wards the center of the product page - increasing their prominence. Impact on adds to cart and sales was measured.

Total Sample: 8,379 • Statistical Power at 5% MDE: 15%

Test #651 by Jakub LinowskiJakub Linowski May 25, 2026 Mobile X.X% Sales

Jakub Tested Pattern #37: List Or Grid View

Pattern #37: List Or Grid View - Variant A
Pattern #37: List Or Grid View - Variant B

In this experiment, a buy box layout without product choices, was laid out differently. In the control, it product options were shown as a vertical list, whereas in the variation they were turned into a 2x2 grid. Impact on adds to cart and sales were measured. (Mobile only)  

Total Sample: 12,579 • Statistical Power at 5% MDE: 8.6%

Test #650 by Jakub LinowskiJakub Linowski May 24, 2026 Desktop X.X% Sales

Jakub Tested Pattern #37: List Or Grid View

Pattern #37: List Or Grid View - Variant A
Pattern #37: List Or Grid View - Variant B

In this experiment, a buy box layout without product choices, was laid out differently. In the control, it product options were shown as a vertical list, whereas in the variation they were turned into a 2x2 grid. Impact on adds to cart and sales were measured.   

Total Sample: 7,800 • Statistical Power at 5% MDE: 10.5%

Test #647 by Jakub LinowskiJakub Linowski Apr 27, 2026 Mobile X.X% Sales

Jakub Tested Pattern #79: Product Highlights

Pattern #79: Product Highlights - Variant A
Pattern #79: Product Highlights - Variant B

In this experiment, a set of 5 alternative product recommendations were moved from the very bottom of the page (control) to the top (variation). These "You May Also Like " recommendations were moved just above the existing product descriptions. Impact on adds to cart and sales was measured.

Total Sample: 29,169 • Statistical Power at 5% MDE: 11.2%

Test #646 by Jakub LinowskiJakub Linowski Apr 25, 2026 Desktop X.X% Sales

Jakub Tested Pattern #79: Product Highlights

Pattern #79: Product Highlights - Variant A
Pattern #79: Product Highlights - Variant B

In this experiment, a set of 5 alternative product recommendations were moved from the very bottom of the page (control) to the top (variation). These "You May Also Like " recommendations were moved just above the existing product descriptions. Impact on adds to cart and sales was measured.

Total Sample: 22,445 • Statistical Power at 5% MDE: 13.8%

Test #629 by Jakub LinowskiJakub Linowski Jan 26, 2026 Desktop X.X% Sales

Jakub Tested Pattern #98: Auto Suggest

Pattern #98: Auto Suggest - Variant A
Pattern #98: Auto Suggest - Variant B

In this experiment (1) the zip code field position was moved up, right below the last name. And (2) entering the zip code would populate the state and city using an autofill API call. Impact on orders completed was measured.

Total Sample: 4,735 • Statistical Power at 5% MDE: 55.4%

Test #628 by Jakub LinowskiJakub Linowski Dec 30, 2025 Mobile X.X% Sales

Jakub Tested Pattern #98: Auto Suggest

Pattern #98: Auto Suggest - Variant A
Pattern #98: Auto Suggest - Variant B

In this experiment (1) the zip code field position was moved up, right below the last name. And (2) entering the zip code would populate the state and city using an autofill API call. Impact on orders completed was measured.

Total Sample: 4,442 • Statistical Power at 5% MDE: 33.9%

Test #627 by Jakub LinowskiJakub Linowski Dec 29, 2025 X.X% Sales

Jakub Tested Pattern #26: Cart Reminder And Recently Viewed

Pattern #26: Cart Reminder And Recently Viewed - Variant A
Pattern #26: Cart Reminder And Recently Viewed - Variant B

In this tightly triggered experiment, users who (1) did not complete a purchase and (2) visited a different product page saw a button in the top-right corner labeled “Don’t Forget Your Club.” Clicking this button resumed the checkout process at the point where they left off, without requiring the same information to be re-entered.

Total Sample: 2,131 • Statistical Power at 5% MDE: 14.3%

Test #623 by Jakub LinowskiJakub Linowski Nov 29, 2025 Desktop Mobile X.X% Sales

Jakub Tested Pattern #139: Page Level Navigation

Pattern #139: Page Level Navigation - Variant A
Pattern #139: Page Level Navigation - Variant B

In this experiment, a single inline page navigation (going to external sub pages) was replaced with multiple and repeated inline page navigations (that linked within the same page). Impact on adds to cart an sales was measured.

Total Sample: 90,196 • Statistical Power at 5% MDE: 35.5%

Test #610 by Jakub LinowskiJakub Linowski Sep 04, 2025 Desktop X.X% Sales

Jakub Tested Pattern #111: Field Explanations

Pattern #111: Field Explanations - Variant A
Pattern #111: Field Explanations - Variant B

In this product detail page experiment, the variation showed a tooltip icon. Upon hovering on the icon it expanded additional information explaining the difference between pay in full and pay per shipment. Impact on sales was measured. 

Total Sample: 26,534 • Statistical Power at 5% MDE: 15.7%

Test #605 by Jakub LinowskiJakub Linowski Aug 21, 2025 Desktop Mobile X.X% Revenue

Jakub Tested Pattern #113: More Or Fewer Plans

Pattern #113: More Or Fewer Plans - Variant A
Pattern #113: More Or Fewer Plans - Variant B

A less expensive product choice (club duration) was added at the beginning of the options. Impact on adds-to-cart, sales and revenue were measured.

Test #600 by Jakub LinowskiJakub Linowski Jul 18, 2025 Desktop Mobile X.X% Sales

Jakub Tested Pattern #63: Trust Seals

Pattern #63: Trust Seals - Variant A
Pattern #63: Trust Seals - Variant B

In this experiment, 4 accepted credit card icons were added to an add-to-cart and checkout flow. Impact on sales was measured.

Total Sample: 7,986 • Statistical Power at 5% MDE: 82.6%

Test #598 by Jakub LinowskiJakub Linowski Jun 27, 2025 Desktop Mobile X.X% Sales

Jakub Tested Pattern #26: Cart Reminder And Recently Viewed

Pattern #26: Cart Reminder And Recently Viewed - Variant A
Pattern #26: Cart Reminder And Recently Viewed - Variant B

This experiment started when a user started a custom product build and visited any other product page. In the variation, a resume button appeared that would bring the customers back to their custom build. Impact on checkouts and sales was measured.

Total Sample: 1,177 • Statistical Power at 5% MDE: 7.7%

Test #595 by Jakub LinowskiJakub Linowski Jun 09, 2025 Mobile X.X% Sales

Jakub Tested Pattern #114: Less Or More Visible Prices

Pattern #114: Less Or More Visible Prices - Variant A
Pattern #114: Less Or More Visible Prices - Variant B

In this mobile product page experiment, the variation changed the look of the floating button area once a product was chosen.

The variation showed a button with 1) pricing totals along with 2) a link back to the edit area and 3) a button that allowed to add to cart directly. Whereas the control only linked back to the top of the page where the product selction was possible. Impact on adds-to-cart and sales was measured.

Total Sample: 22,957 • Statistical Power at 5% MDE: 12.9%

Test #589 by Jakub LinowskiJakub Linowski Apr 30, 2025 Desktop X.X% Sales

Jakub Tested Pattern #68: Welcome Discount

Pattern #68: Welcome Discount - Variant A
Pattern #68: Welcome Discount - Variant B

This experiment added one extra layer of persistence to an appearing welcome discount offer. In the variation, a welcome discount appeared on product pages after some inactivity behavior combined with a delay. In the variation, the only thing that was modified was the "collapse" behavior - basically creating a small floating micro modal in the bottom right. The micro modal allowed users to return to the larger modal or collaping it for good (with a second X collapse button). Impact on sales was measured.

Total Sample: 23,605 • Statistical Power at 5% MDE: 17.5%

Test #586 by Jakub LinowskiJakub Linowski Apr 25, 2025 Mobile X.X% Sales

Jakub Tested Pattern #48: Video Testimonials

Pattern #48: Video Testimonials - Variant A
Pattern #48: Video Testimonials - Variant B

In this experiment, a video unboxing and product overview video was added on product pages (below the buy box). After pressing play, the video started playing with a visible "close" control to allow stopping of the video.

Impact on adds to cart and sales was measured.

Total Sample: 4,828 • Statistical Power at 5% MDE: 6.7%