For a small business, the cost of a software bug has five parts: sales lost while it was broken, support time and compensation, ad spend sent to a page that did not work, hours of fixing and rework, and the trust of customers who will not return. The later a bug is found, the more all of these grow together. The cost of QA, in turn, is time, a subscription or a salary, driven by how often you check and how big the system is. No single figure fits everyone; work out your own: what is one day of a broken money-making journey worth?
- cost of software bugs
- how much does QA testing cost
- is QA worth it for a small business
- how much does a QA tester cost
- cost of website downtime for a small business
- why are bugs more expensive to fix later
What does a software bug really cost a small business?
Ask a store owner what the last bug cost and you will hear 'two hours of the developer's time'. That is the smallest line on the bill. The real cost of software bugs is paid in places no statement shows: orders that never completed, an ad that sent people to a button that did not work, and a customer who tried once and never returned.
Illustration| Kind of cost | How it shows up | Easy to see? |
|---|---|---|
| Lost sales | Orders and bookings not completed while it was broken | Only if you compare with normal days |
| Wasted ads | You paid to bring visitors to a broken journey | No; it looks like a weak campaign |
| Support time | Messages, calls and apologies | Partly |
| Compensation and refunds | A discount, free shipping, money back | Yes |
| Fixing and rework | Developer hours, and planned work pushed back | Yes, and usually the smallest |
| Bad data | Duplicate orders, wrong stock, overlapping bookings cleaned by hand | Weeks later |
| Trust | A customer who did not return, a bad review others read | No, and it costs most |
We give no percentages or averages here, because no general figure for 'the cost of bugs' applies to your business. What applies is the method, in the third section.
Why does the same bug cost more the later you find it?
The logic is simple: each stage a bug crosses undetected increases two things at once, the number of people affected and the amount of work built on top that must be redone. Follow one bug, a system that lets the same slot be booked twice:
- At descriptionA line in a document
Someone asks: 'what if two people book the same slot?' Cost: a minute of discussion and one written line.
- During the buildA small change
Found while trying the feature. Cost: an edit in one place nothing else depends on yet.
- Before launchA bug in a report
The check finds it. Cost: a fix and a re-test, perhaps a day's delay.
- After launchTwo customers at the door
Two customers arrive for the same slot. Cost: an apology, compensation, an urgent fix and an embarrassed employee.
- Weeks laterPolluted data
Dozens of overlapping bookings reviewed by hand, bad reviews in public, and customers who no longer trust a confirmation.
The bug does not change, but its bill grows with every person who sees it before you do.
That is why the cheapest quality is not testing at all, but a clear description before building. Read how to write a requirements document. Testing before launch is the last line of defense before the cost starts multiplying.
How do you calculate the cost of a bug in your own business?
You need no study, just four numbers you know or can pull from the admin panel in five minutes:
- 1What does your core journey earn per day?
Daily orders or bookings multiplied by the average order value.
- 2What share does the bug touch?
A phone-only bug touches those ordering by phone. A bug in one payment method touches its users.
- 3How many days does the bug live before you know?
The most important number and the most neglected. Without regular checks the answer is 'until someone complains'.
- 4Add what surrounds it
Support and fixing hours, compensation, and the ad spend of those days.
An example with made-up numbers, for illustration only: a store takes 40 orders a day at an average of 150 riyals. The pay button breaks on phones, and three quarters of its orders come from phones, so 30 orders a day. The bug lives two days before a customer calls. Lost sales: 30 × 2 × 150 = 9,000 riyals. Add two days of ad budget and the support hours. Had it been found on the first morning, the loss would be a small part of that. Put your own numbers in.
What does QA cost? The options and the shape of each cost
We quote no prices; they differ and change. The shape of each cost, and what hides behind it, is fairly constant:
| Option | Shape of the cost | Hidden cost | Fits |
|---|---|---|---|
| Nothing | Zero on paper | Everything in section one, paid first by your customers | Nobody, yet the most common |
| You check by hand | Your time | You tire and cut corners, and stop seeing the familiar | Starting out and small sites |
| The team takes turns | Hours from every member | Stops at the first busy week | Teams of three to ten |
| Freelance tester | By the hour or project | Needs briefing on the product each time | Big releases and exploration |
| Full-time tester | A fixed salary | A small team may not have enough work | Complex products or ones with devices |
| Test code by a developer | Developer time to write it | Constant upkeep as the interface changes | Mature technical teams |
| AI QA agent | A subscription that moves with use | Someone must review the plan and read the report | Teams with no tester |
Most small businesses end up with a mix, not one option. The detailed comparison is in AI QA agent or a human tester, and the cost of building the app itself in the cost to build an app with AI.
What drives the cost of an AI QA agent?
In Fanann, the QA Engineer is part of the paid plans, and each plan has monthly allowances. The numbers are on the pricing page. These are the factors that drive your usage, close to what you will find across the category:
- Test runs
- How many you start per month
- Browser minutes
- Run length, and one screen or two
- Saved cases
- The size of the test library
- External sites
- Sites built outside Fanann
- Plan preparation
- Each new plan uses a little credit
- Extras
- Schedules, export and sharing on higher plans
- Keep the daily run short: the quick check for top cases, the full one only before a release.
- Pick one screen for regular checks: phone and desktop together use more minutes.
- Rerun saved cases: rerunning a saved case needs no new planning.
- Archive what does not matter: a case you would not act on when it fails has no place in the run.
Before each run you see a rough estimate of tests, minutes and credits, and you are charged for what is actually used.
How much QA is enough for you?
Go back to the figure you calculated: one day of failure in your core journey. It sets where you stand:
Pick the one that sounds like you to see the advice.
A manual pass with a checklist before launch and after big changes is enough. Do not buy tools before you have something to lose.
A check before every publish and a regular quick check. Here an agent often pays for itself with the first fault it catches before a customer.
An agent on a daily schedule, a full re-check before each release, human sessions on new features, and a mandatory staging copy.
Your bug hits your clients' businesses. Add a human tester, plus security and load reviews by specialists before peak seasons.
Where does QA money get wasted?
Overspending on quality exists too:
- Testing what does not matter with equal care: the About page does not deserve what the payment page does.
- A huge library nobody trusts: hundreds of cases, many always failing for reasons unrelated to the app. Each false alarm costs minutes of attention.
- Reports nobody reads: a run whose report stays unopened is spend with no return.
- Fixing everything: low bugs get batched and fixed together, or left by deliberate decision.
- Hiring early: a full salary for work that fills two days a week.
- Automating before things settle: writing tests for an interface that changes next week.
How do you start at the lowest cost?
Start with the one journey whose failure you priced, not the whole site. Fanann's QA Engineer takes your site address, built in Fanann or elsewhere, proposes cases you review and approve before it starts, tests in a real browser, reports with screenshots and severity, and re-tests after the fix.
I want the fewest tests that protect the store's income. Test one journey only, at phone size: from a product page, to the cart, to the payment page, without completing a real payment. Confirm that price, quantity and the total including VAT are correct at every step, and that the continue button is visible and works on every page. Do not change any data. Keep the cases few and stable so I can rerun them after every change with the least usage.
Try it in FanannKey takeaways
- The fixing hour is the smallest part of a bug's cost; the biggest is what was lost before you knew.
- The same bug costs more at every stage it passes undetected, because more people are affected and more must be redone.
- Calculate a day of failure in your core journey; that figure sets how much to spend on quality.
- The cheapest quality sits closest to the build: a clear description, a check before publishing, a recheck after each change.
- An AI QA agent's cost moves with runs, browser minutes and library size, so start small.
Frequently asked questions
How much does a software bug cost an online store?
Is QA testing worth the cost for a small business?
How much does a QA engineer or software tester cost?
Why are bugs more expensive after launch?
What is the cheapest way to reduce bugs?
Is Fanann's QA Engineer free?
Ask your AI assistant about this
Copy this prompt into the AI assistant you use, then add the details of your own case.
I am reading this guide: “What bugs really cost a small business, and what QA costs” https://fanann.com/en/blog/cost-of-software-bugs-and-qa/ My question: cost of software bugs Use that page as a source and explain the answer step by step for my situation, tell me what to check before I start, and cite the page link.