The Real Cost of Your SaaS Stack: A Calculator That Does the Math

1. Why Nobody Knows What They're Spending

SaaS pricing is engineered to feel invisible. Every tool is sold on a per-month basis, billed to a company card, and approved once during onboarding. By the time renewal comes around, the tool feels like infrastructure — something that just runs, not something you actively chose to keep paying for.

The result: companies end up paying for tools they've half-abandoned, services two people use but 12 people are licensed for, and features they've never touched because they were bundled into the tier that seemed like the right size three years ago.

A few patterns we see consistently:

• Overlap creep. You bought Slack for messaging, then added Notion for docs, then added Asana for tasks, then someone bought Linear "just for engineering." Now you have four tools that partially overlap and four monthly invoices to show for it.
• Tier anchoring. You signed up for a mid-tier plan because the features looked right. Two years later you're using 30% of those features and would have been fine on the lowest tier — but downgrading feels like effort nobody has time to schedule.
• Zombie subscriptions. Tools kept alive because one person uses them monthly and removing the subscription requires more coordination than it's worth. These are the $29–$79/month lines that nobody audits because they're not worth a meeting but add up to $1,000+ a year.

None of this is negligence. It's just how SaaS is designed to compound quietly.

2. What Typical Stacks Actually Cost

Let's put real numbers to this. These are representative stacks — not cherry-picked worst cases, just what we encounter regularly when doing friction audits.

Freelancer / Solo (1–3 people)

Tool	Category	Monthly	Annual
Notion	Docs / project management	$16	$192
Calendly	Scheduling	$12	$144
HoneyBook or Dubsado	CRM / client portal	$40	$480
Canva Pro	Design	$13	$156
Zapier (Starter)	Automation	$20	$240
Loom	Video messaging	$12	$144
Total		$113/mo	$1,356/yr

$1,356 a year for a solo operator isn't catastrophic — but it's also $1,356 of recurring overhead before you earn a dollar. And it buys you tools you share branding with, not tools you own.

Small Team (4–15 people)

Tool	Category	Monthly	Annual
Slack (Pro, 10 seats)	Messaging	$75	$900
Notion (Team)	Docs / wiki	$80	$960
Asana (Premium, 10 seats)	Project management	$105	$1,260
HubSpot (Starter)	CRM	$45	$540
Zapier (Professional)	Automation	$49	$588
Loom (Business)	Video	$80	$960
DocuSign (Standard)	eSignatures	$25	$300
Typeform (Plus)	Forms	$50	$600
Total		$509/mo	$6,108/yr

$6,108 a year. That's a meaningful engineering budget — enough to fund a custom internal tool that consolidates half this stack and runs indefinitely with no monthly fee.

Growing Company (15–50 people)

Tool	Category	Monthly	Annual
Slack (Pro, 30 seats)	Messaging	$225	$2,700
Notion (Business, 30 seats)	Docs	$480	$5,760
Jira (Standard, 30 seats)	Project management	$210	$2,520
HubSpot (Professional)	CRM	$890	$10,680
Intercom (Starter)	Customer support	$74	$888
Zapier (Team)	Automation	$69	$828
Figma (Professional, 5 seats)	Design	$60	$720
Stripe + billing overhead	Payments	~$150	~$1,800
Total		$2,158/mo	$25,896/yr

At this scale, the SaaS bill is larger than most companies' cloud hosting bill. And the HubSpot Professional line alone — $890/month — often triggers the "could we build this?" conversation.

3. How to Do the Math on Your Own Stack

The FrictionKit SaaS Calculator does this automatically — you add your tools and it calculates annual spend, estimated replacement cost, and payback timeline. But here's the manual framework if you want to think through it first.

Step 1: List every SaaS tool you pay for

Pull your credit card statements for the last 90 days. Flag every recurring software charge. Include the ones you've forgotten about — those are often the most interesting.

Step 2: Categorize by function

Group tools by what they actually do: messaging, project management, CRM, automation, forms, analytics, signing, billing. You'll usually find 2–3 categories where you're paying for overlapping functionality.

Step 3: Score each tool on two axes

For each tool, ask: how often is it used (daily / weekly / rarely) and how much of the feature set does your team actually use (all of it / half / a small fraction)? Tools in the "rarely used, using a fraction of features" quadrant are your highest-leverage candidates for replacement or cancellation.

Step 4: Calculate the replacement math

For any tool you're seriously considering replacing, the math is: (annual subscription cost) × (expected years of use) vs. (custom build cost) + (annual hosting, ~$100–$300/year). The crossover point — where custom gets cheaper — is usually 18–36 months for tools costing $40–$100/month, and 12–18 months for tools costing $200+/month.

4. What's Actually Worth Replacing (And What Isn't)

Not every SaaS tool is a replacement candidate. Here's the honest framework.

Strong candidates for custom replacement

• Client portals and dashboards — tools where clients log in and see your work. The branding case is as strong as the cost case. (Read: How to Build a Client Portal Without Paying $500/Month)
• Internal operational tools — quote generators, job trackers, approval workflows, anything your team uses daily but that's been jury-rigged across 3 SaaS tools. (Read: 5 Signs Your Business Has Outgrown SaaS)
• Data collection and reporting — forms + spreadsheets + a BI tool is a $300–$600/year stack that's often replaceable with a single focused custom tool.
• Billing and invoicing — if you're using a CRM's billing module because it came in the plan, that's a $200+/month feature you may not need at all if your billing is simple.

Keep the SaaS when

• The tool integrates deeply with external systems you don't control — payment networks, email providers, carrier APIs. Don't rebuild the integration layer.
• The product category moves fast and staying current matters — security tools, compliance software, AI-native products that update their models quarterly.
• The team genuinely uses the full feature set and the price reflects real value delivered per user per month.
• You're under 12 months old and still validating whether the workflow is even the right workflow. Build custom once the workflow is proven, not before.

5. The Numbers Most People Miss

The monthly subscription is the visible cost. The hidden costs are what make the math even more compelling.

Integration tax

Every SaaS tool that doesn't talk to your other tools needs a middleware layer — usually Zapier or Make. Zapier Professional is $49/month just to connect tools that should share data natively. That's $588/year to compensate for the fact that you're using five separate products instead of one that does what you need. Custom tools don't need middleware — data lives in one place.

Training and onboarding overhead

Every new hire has to learn your SaaS stack. Four tools means four onboardings, four sets of login credentials, four places to look for the same information. The time cost per hire is real even if it doesn't show up in your SaaS bill. (Read: Why Companies Are Ditching SaaS for Custom Apps)

Data fragmentation

Client info in HubSpot. Project notes in Notion. Invoices in FreshBooks. Time tracking in Harvest. Every insight you want requires exporting from multiple tools, reconciling formats, and hoping nothing got out of sync. A custom tool that owns all this data gives you reporting you can actually act on — not a spreadsheet export exercise. (Read: Why Every Freelancer Needs a Custom Tool)

Vendor dependency risk

Your critical workflow is one acquisition, pricing change, or sunset away from a forced migration. We've seen teams scrambling when a beloved tool raised prices 40% on renewal, announced end-of-life with 90 days notice, or got acquired and folded into an enterprise product the team couldn't afford. Your custom tool doesn't disappear. (Read: How Much Does Custom Software Actually Cost?)

6. Use the Calculator to See Your Numbers

The fastest way to answer "how much am I spending on SaaS?" is to use the FrictionKit SaaS Calculator. Add your tools, set the monthly cost, and it calculates:

• Your total annual SaaS spend
• Estimated custom replacement cost for high-value targets
• Payback timeline and 5-year total cost comparison

Takes about 3 minutes. You don't need to have a replacement in mind — the calculator helps you figure out which tools are even worth thinking about.

If the numbers look interesting and you want to dig into your specific stack, the Friction Audit is the right next step. Half a day, $500, and you walk away with a written breakdown of your highest-friction tools, what replacement would cost, and which ones are worth it. Not ready to book yet? Start with the free SaaS Cost Audit Checklist — an 8-step self-guided audit framework. See also: FrictionKit Services & Pricing for what a full build engagement looks like.