We all have faced one common critical situation. We find a coupon, type it in at checkout page then see an error message — “Invalid code.” Nothing. It’s frustrating, and more common than it should be. Isn’t it?
So instead of guessing, our team has decided to test it actually. In past six weeks, our Chicago-based team ran an experiment by testing 200 codes, 50 stores, six categories. We made a complete list including failed and working offers with the proper reason. The results were surprising and useful than we ever expected.
The Short Answer: It Depends Heavily on Where You Found the Code
The source of a coupon code can be just as important as the code itself — coupon codes from a Reddit thread (even from a few years ago) are not comparable to coupon codes sourced from a brand’s official affiliate program.
Here’s what our testing showed across all 200 codes:
- Success rate from verified, direct-source codes: 73%
- Success rate from unverified third-party aggregators: 31%
- Success rate from browser extension auto-apply: 44%
- Overall average across all 200 codes tested: 52%
A promo from a random source will have about a 50% success rate; however, you can more than double your chances of getting a working deal by using a site that actively verifies information on an ongoing basis — that is essentially what our site is designed to accomplish.
Category Breakdown: Where Promos Are Most Reliable
Not all stores are equal. Here’s how our six tested categories ranked by success rate:
- SaaS & AI Tools: 81% success rate. These companies run structured promotions with clear terms and expiry dates — by far the most reliable category.
- WordPress Themes & Plugins: 76%. Tied to developer release cycles and seasonal events. Highly predictable.
- Trading & Financial Tools: 67%. Subscription-based, with structured annual promotions.
- Home & Lifestyle: 61%.
- Fashion & Apparel: 58%. Flash sale culture means codes expire quickly.
- Electronics & Gadgets: 49%. Thin margins mean fewer deep-discount codes. Many restrict to first-time buyers.
Our research has shown that the best sources to obtain codes are from companies offering software and SaaS — they are likely to have a significant amount of savings and provide verified sources that will tell you for sure whether or not their vouchers are valid.
Why Do Deals Fail? The 5 Most Common Reasons
1. The Code Has Simply Expired
38% of all offers failed because they had an expiration date and were not removed in a timely manner by the typical third-party website. Always check the “Date Verified” before using any on a third-party site.
2. Single-Use Codes Already Redeemed
19% of failed for being unique one-time-use codes that had already been redeemed and continue to be made available on websites by influencers and other means.
3. First-Time Customer Restrictions
22% of those codes that did not work were technically valid codes, but not valid for customers who had purchased before.
4. Minimum Spend Thresholds Not Met
There are ones that require a minimum amount in the shopping cart, like $30, $50, or $100. If you don’t have that amount in your shopping cart, the code will not work, and you will not get an error message that will tell you that the code you entered is not valid.
5. Geo-Restrictions
Another 8% of the codes that did not work were region-locked codes. Some were US-only codes entered while we were outside the country, and some were state-specific codes that we were not eligible for since we were in Illinois.
The Browser Extension Problem Nobody Talks About
Browser extensions like Honey, Capital One Shopping, or Rakuten may be helpful when shopping online, but there is another less talked-about problem that we faced during our testing. Browser extensions may override any code you entered with a code of less value. During our testing, we found that an extension applied a 5% code while we were ready to enter a 20% code.
The solution to the problem is simple – disable your coupon extension before you enter your code that you found on a verified website like MineMyDeal.
How We Achieve a Higher Success Rate
The codes on our site are verified daily to ensure their validity. Additionally, we partner with many SaaS companies to get notifications of upcoming deals. Whether you are looking for AI platform deals or WordPress theme discounts, we have got them here. Those categories are highly demanded because they deliver the highest real-world success rates.
If you come across a code that doesn’t work, please reach out to us via email, and we will have the removed from our site within 24 hours.
The Bottom Line
Rating of 52% for random deal sources goes to 73% for those that have been verified and have current listings. Consistency has shown to be the greatest reward for code hunters in the SaaS tools, plug-ins, and subscription-based software categories.
So always start with the verified vouchers, be sure to understand the common failure points, and turn off your browser extensions when you are manually entering a code. You can also see the latest offers here.
If you would like to learn more about how consumers use coupons, CouponFollow has several research reports that are full of data-based evidence on how Americans typically use and feel about coupons.