Gmail addresses drive the highest open rates of any platform — 49%, compared with 44% for iCloud and 40% for Microsoft. But they produce the lowest engagement after opening, according to State of Digital Receipts 2021, an infographic by post-purchase marketing platform flexEngage. 

In contrast, ISP-based domains — such as AT&T and Comcast — garner the highest click-to-open engagement.

FlexEngage analyzed over 150 million receipts across 40 retailers.

It found that the average open rate is 41%, and the click-to-open rate is 7%.

But these metrics vary by industry and the amount spent. Take the opens produced by these verticals:

• Jewelry — 58%
• Apparel — 51%
• Sports — 47%
• Home goods — 42%
• Footwear — 38%
• Health & Wellness — 38%

The ranking changes slightly with click-to-open rates:

• Jewelry — 11%
• Home goods — 9%
• Footwear — 7%
• Apparel — 5%
• Sports — 3%

People spending $2,000+ score 164 on the open-rate index and 431 on the click-to-open index. 

In contrast, those spending $10-$50 generate a score of 92, and $0-$10 on the open-rate index. 

Consumers spending $200 to $500 produce a score of 111 on the open-rate index, and 149 on the click-to-open index. These shoppers are also four times more likely to request a printed and digital receipt. 

In addition, Non-loyalty shoppers drive a 4% higher open rate and 51% higher click-through rate compared to loyalty members.