Your marketing stack is probably doing less work than you think. Gartner's 2025 Marketing Technology Survey found organisations use only 49 per cent of the martech capability they buy, and just 15 per cent qualify as high performers. The number of tools keeps climbing too: chiefmartec's annual census counts 15,384 marketing solutions, up 9 per cent on the year before. A marketing tech stack audit is the fastest way to find which of yours actually earns its keep.
Most teams never run one. They add a tool when a problem appears, keep it when the problem moves, and renew it out of habit. By the time anyone looks, the stack runs on autopilot and the budget leaks quietly. The good news is the leak is mostly recoverable. The four phases below walk through what to check, where the data lives, and how to decide what stays.
What a stack you never audit really costs
Zylo's 2026 SaaS Management Index puts the average licence utilisation rate at 54 per cent, while best-in-class teams reach at least 90 per cent. That gap is the difference between a stack that pays for itself and one that quietly burns the marketing budget. Zylo's analysis of wasted SaaS spend found the average organisation wastes USD 19.8 million a year on unused licences alone, and unused licences are the largest recoverable cost category in most stacks.
Perception makes it worse. Ascend2's survey of 311 marketing decision makers found 96 per cent view their marketing technology as successful at hitting strategic objectives. If nearly everyone believes the stack is working, nobody questions the renewals. The audit is the reality check the dashboard does not give you.
Mid-sized teams feel it per head. Cledara's spend data across more than a million transactions shows companies of 50 to 100 employees spend around USD 193,716 a year on software, and companies of 100 to 200 spend roughly USD 251,119. Marketing accounts for 20 to 25 per cent of that, according to Briefwrk's review of mid-market stacks, which found companies of 50 to 200 employees run 87 SaaS applications on average.
Waste hides in four places. Unused licences, duplicate tools, shadow IT and missed renewals each need a different fix, and the four-phase process below covers all of them.
Phase 1: Inventory every tool and subscription
An audit starts with a complete list, and the list is almost always longer than anyone expects. If your company runs the typical 87 applications at 50 to 200 employees, marketing probably owns twenty or more of them. Write them all down before you judge any of them.
Start with the money
Pull the billing record first. Every credit card, every invoice, every auto-renewal notice. If you have finance software or a spend management platform, export a year of transactions and group them by vendor. Cledara's analysis of more than a million transactions gives a sense of what to expect. Roughly USD 193,716 a year for a 50 to 100 person company, or USD 251,119 for one at 100 to 200. Marketing's share of that bill is your starting point.
Add the free tools and the shadow IT
Then add everything else. Free tiers, trial accounts that never expired, tools your team signed up for with a work email that finance never saw. This shadow IT, software that exists outside the approved list, is a bigger share of the stack than most leaders realise. VoxBooster's 2026 roundup reports 53 per cent of enterprise apps operate as unapproved shadow IT, so assume your list is missing something and go hunting in browser extensions and SSO logs.
Name an owner for every tool
For each entry record four things: cost per year, number of licences, the person who owns it, and the renewal date. MarketingOps.com's audit guide makes the point that a sustainable process needs an owner for every tool. Without one, tools survive because nobody is responsible for them. Smart Insights' Dave Chaffey frames the whole exercise around six categories, customers, channels, campaigns, content, commerce and capabilities, which is a useful way to make sure the inventory covers the full job, not just the tools you remember.
Phase 2: Measure usage against the licence
An inventory tells you what you pay for. Usage data tells you what you actually use. Zylo's index found the average organisation uses 54 per cent of its SaaS licences, and Gartner's 2025 survey puts martech capability utilisation at 49 per cent. The gap between the licence count and the login count is where the money goes.
Pull the login and feature data
Most tools expose admin reports that show active users, logins in the last 90 days, and feature adoption. Export them for every platform. The tools you cannot get usage data from are the ones to question first, because a vendor that will not show you adoption is usually protecting a number. For the tools that matter most, your CRM is part of this picture too, and if the records inside it are stale, our automated CRM data hygiene workflow keeps the pipeline honest while you work through the rest.
Run the 30-day test
McGaw's audit guide reports most companies find 30 to 50 per cent of their tools significantly underutilised. Mark anything nobody has opened in 30 days, then keep the list for another 30. A tool that no one touches for two months is either broken, redundant, or solving a problem that moved. In one documented case, a mid-market marketing director was running 41 tools with an annual contract value above USD 400,000 for a team of four, and actively used maybe twelve in a given week. Fuel Up Your Marketing's writeup of that case concludes the fix is a quarterly audit, not a new platform.
Phase 3: Find the duplicates doing the same job
Duplicates are the sneakiest cost because both tools look justified on paper. Sonder Digital, an audit firm that has benchmarked more than 200 B2B companies, reports 83 per cent of B2B stacks have tool overlap. Their example finding is that HubSpot plus Mailchimp shows around 70 per cent feature overlap, which means the pair is paying for duplicate email automation.
StackOverlap, which has run more than 550 martech audits, finds the most consistent overlap is email and analytics, because every major platform now ships a good enough version of the other's core feature. Their average finding is USD 173,750 in annual licensing waste per organisation. That number is worth holding onto for the budget conversation later.
Map function to tool
For each function you need, list every tool that does it. Email: your CRM, your email platform, your helpdesk. Analytics: GA4, your customer data platform, your ad platform reporting, your BI tool. Social scheduling: native tools, scheduling platforms, AI assistants. The overlap appears fast once the functions are on the page.
| Function | Typical overlap | What to keep |
|---|---|---|
| Email marketing | CRM, email platform, helpdesk | The one with the best automation and deliverability |
| Web analytics | GA4, CDP, ad platform reporting | The one your team actually reads |
| Social scheduling | Native tools, scheduling platform, AI assistant | The one with approval workflows |
| Content production | Design tool, CMS, AI writing assistant | The one with the shared brand library |
Score the overlap
Keep the tool that does the job best for the way your team works, not the one with the most features. Zylo's application redundancy framework recommends comparing user overlap, adoption and spend across similar applications, then consolidating at contract renewals. The scoring is straightforward. Which one would the team fight to keep, and which one only survives because it auto-renews?
Phase 4: Cut, consolidate and set a renewal calendar
The hard part is stopping the stack from growing back once the cut list is agreed. MarTech.org's 2025 Replacement Survey found 59.9 per cent of respondents replaced a marketing application in the previous year, yet 62.9 per cent of replacers added applications to their stack, and only 22.6 per cent saw their stack shrink. Replacement without reduction is how stacks double every few years.
Cut to a decision date
Give every flagged tool a decision date, not a vague next quarter. If a licence is unused and has no renewal lock-in, cancel it now. If it is underused but has a renewal coming, put it on the calendar and decide before that date. The cut is easier than it feels, because the data is on your side. The tool has been open twice in 90 days, and the renewal notice just arrived.
Consolidate at renewal, not before
The cheapest consolidation happens when contracts expire. Zylo's redundancy framework is built around this, because cancelling mid-term costs you the same money and adds a migration rush. McGaw's team avoided more than USD 100,000 in new annual costs for one client by wiring existing attribution tools together instead of buying another. For the decisions where a new build genuinely beats another subscription, our build vs buy analysis of marketing automation costs covers when that trade makes sense.
Build the renewal calendar
One calendar with every renewal date, contract value and owner. It turns the audit from an event into a habit. Every month you see what is coming due, and every quarter you run the 30-day usage check before anything renews. This single spreadsheet does more to stop waste than any procurement policy.
What a marketing tech stack audit does to your budget
The savings are consistent across every source. StackOverlap's 550+ audits average USD 173,750 in annual licensing waste per organisation. Optystack's 2026 analysis estimates 25 to 30 per cent of SaaS budgets are wasted. Zylo puts the average licence utilisation at 54 per cent against a 90 per cent best-in-class benchmark. Even a conservative result, recovering a quarter of the software budget, usually funds the year's actual growth work.
A clean stack changes more than the budget. Teams managing 15 or more tools lose roughly 40 per cent of their operational time to tool management itself, according to Prooflytics' framework. Cutting ten tools from a stack of twenty is a productivity exercise with a line item attached. Vertice's research shows the pattern holds at every company size, and that underutilised tools, those using less than half their purchased capacity, cost more than fully unused licences. The audit should target underuse first, not just shelfware.
| Waste category | What it looks like | Where to find it |
|---|---|---|
| Unused licences | Seats paid for, nobody logs in | Admin usage reports |
| Duplicate tools | Two platforms doing the same job | Function-to-tool map |
| Shadow IT | Tools bought on a card finance never saw | Browser extensions, SSO logs |
| Missed renewals | Auto-renewals at last year's price | Contract calendar |
That freed budget does its best work when it follows a clear allocation model. Our guide on marketing budget allocation from ad spend to pipeline shows how to direct recovered spend toward the channels that actually convert.
Frequently asked questions
How long does a marketing tech stack audit take?
A focused audit runs in two to four weeks. The inventory takes the first week, usage and duplication analysis the second, and the cut list lands by the end of the month. The recurring version is a quarterly review against the renewal calendar, which takes a day.
What is shelfware in a martech stack?
Shelfware is software you pay for but never use. It builds up through trial accounts that convert, tools bought for one campaign, and platforms kept after the team that used them left. Zylo's research identifies unused licences as the largest recoverable cost category in most stacks.
How do you find duplicate marketing tools?
Map every function to the tools that perform it. Email, analytics, social scheduling and content production are the usual suspects, because every major platform now ships a version of the others' core features. Sonder Digital's benchmark found HubSpot and Mailchimp alone overlap by about 70 per cent on features.
How much can we save by cutting unused software?
Audit firms report average annual licensing waste between USD 173,750, from StackOverlap's 550+ audits, and the 25 to 30 per cent of SaaS budget that Optystack estimates is wasted. The range depends on how long the stack has gone unaudited.
How often should we audit the marketing tech stack?
Quarterly, tied to renewals. A full audit twice a year catches new duplicates before they renew, and the quarterly renewal review keeps decisions honest. Fuel Up Your Marketing's case study reaches the same conclusion. A quarterly audit tied to renewals keeps the stack honest.
Audit your stack this quarter
Start with the billing export. You will probably find the first wasted licence in the first ten rows, and that one find usually justifies the whole exercise. Work the four phases in order, keep the renewal calendar running, and the stack stops being a mystery line item.
This is something we do at Supernodes. Two-week pilot: audit, connect, measure. Speak with us if it sounds like your Monday morning.