The Founder Guide to Software Maintenance Costs

You shipped your product. The launch went well. Users are signing up. And then someone asks: “So what does it cost to keep this thing running?”

If you have never built software before, you might assume the answer is close to zero. The app is built, after all. But software is not a bridge. It does not just sit there. It runs on servers that charge by the hour. It depends on third-party services that update their APIs. It serves users who find bugs you never imagined. And it exists in a security landscape that changes weekly.

We have built and maintained over a dozen products at Threshline — from MindHyv, an all-in-one business platform, to LancerSpace, a freelancer workspace with CRM, invoicing, and proposals. Every single one of them has ongoing costs. Here is what those costs actually look like, and how to budget for them as a founder.

The Rule of Thumb: 15-20% of Build Cost Annually

Before we get into line items, here is the number that matters most. Industry-wide, software maintenance costs roughly 15-20% of the original build cost per year. If your product cost $100,000 to build, expect to spend $15,000-$20,000 annually to keep it healthy.

That number covers hosting, bug fixes, security patches, dependency updates, and minor feature work. It does not cover major new features or rebuilds — those are separate investments.

Some founders hear this and flinch. But compare it to the alternative: letting the product rot. Unpatched security vulnerabilities, broken integrations, and mounting technical debt will cost you far more when you finally have to deal with them. Maintenance is not an expense. It is insurance.

Hosting and Infrastructure: $50-500/month

This is the most predictable cost. Your application needs servers, databases, file storage, and CDN bandwidth. For a typical SaaS product serving a few thousand users, here is what the range looks like:

Low end ($50-150/month):

• Vercel or Cloudflare Pages for the frontend (free tier or $20/month pro)
• Supabase for database and auth ($25/month for the Pro plan)
• Basic file storage via Supabase Storage or Cloudflare R2
• Transactional email via Resend or Postmark ($20/month)

Mid range ($150-350/month):

• Vercel Pro with higher bandwidth ($20/month)
• Supabase Pro with more database compute ($25-75/month)
• Dedicated Redis for caching ($15-30/month)
• Error tracking with Sentry ($26/month)
• Uptime monitoring ($10-20/month)
• Transactional + marketing email ($50-100/month)

High end ($350-500+/month):

• Multiple environments (staging + production)
• Larger database instances for heavier query loads
• CDN with custom rules and edge functions
• Log aggregation and observability tools
• Automated backups with longer retention

We run most of our products on the Supabase + Vercel/Cloudflare stack. For Trackelio, our customer feedback platform, hosting sits comfortably under $100/month even with steady traffic. The key is choosing infrastructure that scales with usage rather than requiring upfront capacity planning.

One thing to watch: costs can spike if you are not careful with database queries, file storage, or serverless function invocations. Set billing alerts early.

Third-Party Services: $50-300/month

Almost every modern product depends on services you do not build yourself. These add up quietly:

Service	Typical Cost	Example
Payment processing	2.9% + $0.30/transaction	Stripe
Email delivery	$20-100/month	Resend, Postmark, SendGrid
SMS/OTP verification	$0.01-0.05/message	Twilio
File storage/CDN	$5-50/month	Cloudflare R2, AWS S3
Search	$0-50/month	Algolia, Meilisearch Cloud
Analytics	$0-30/month	Plausible, PostHog
Error tracking	$0-26/month	Sentry
Maps/geocoding	$0-50/month	Google Maps, Mapbox

The free tiers are generous for early-stage products, but they have limits. When SpotsMexico — a photography location directory — started getting consistent traffic, we had to plan around map API costs because those scale with page views.

Budget $50-300/month for third-party services depending on your product’s complexity. Review these costs quarterly. Services you signed up for at launch may have cheaper alternatives six months later.

Bug Fixes and Support: 2-4 Hours/Month Minimum

Bugs are inevitable. Not catastrophic ones (hopefully), but the kind that trickle in from user reports, edge cases in specific browsers, or data states you did not anticipate.

For a stable product, expect to spend 2-4 hours per month on bug fixes as a baseline. That covers:

• Investigating user-reported issues
• Fixing display bugs across devices
• Handling edge cases in form validation or data processing
• Resolving intermittent errors caught by error tracking

During the first three months after launch, expect more — closer to 8-12 hours per month. This is normal. Real users stress-test your product in ways QA cannot.

At developer rates, budget $500-$2,000/month for bug fixes. If you are working with an agency like us, this is often handled through a retainer agreement rather than per-incident billing. Retainers are better for both sides: you get predictable costs, we get context continuity.

Security Updates and Dependency Maintenance: 2-4 Hours/Month

This is the category founders most often overlook, and the one that bites hardest when ignored.

Your application has dependencies — libraries, frameworks, runtime versions. These receive security patches regularly. A typical Node.js project might have 200+ dependencies in its tree. Any one of them could have a vulnerability disclosed next week.

Here is what regular security maintenance looks like:

# Check for known vulnerabilities
npm audit

# Update dependencies within semver ranges
npm update

# Check for major version updates that need manual migration
npx npm-check-updates

Beyond dependency updates, security maintenance includes:

• Rotating API keys and secrets periodically
• Reviewing access controls as team members change
• Updating SSL certificates (usually automated, but verify)
• Patching the runtime (Node.js, Dart, Python version updates)
• Reviewing database permissions and row-level security policies

We handle this for every product we maintain. For Vincelio, a creator marketplace, we run dependency audits on a weekly cadence. Most weeks, nothing needs attention. But when something does, catching it early means a 30-minute fix instead of a weekend emergency.

Budget 2-4 hours per month for security and dependency maintenance. This is non-negotiable. Skipping it is how breaches happen.

Feature Work: The Variable Cost

This is where budgets vary the most. Some founders ship and move on. Others treat launch as the starting line and iterate aggressively based on user feedback.

Feature work typically falls into three buckets:

Small enhancements (2-8 hours each): Adding a filter to a list view, tweaking a notification email, adding an export option. These are the “quick wins” that keep users happy.

Medium features (1-3 weeks): Adding a new integration, building a reporting dashboard, implementing a new user role. These require planning, design review, and QA.

Major features (1-3 months): Adding a completely new module — like when we added the invoicing system to LancerSpace, or the booking engine to MindHyv. These are essentially mini-projects within the existing product.

If you are actively iterating, budget $2,000-$8,000/month for feature work. If you are in maintenance mode with only occasional enhancements, $500-$1,500/month covers it.

The key insight: feature work should be driven by user feedback and business metrics, not founder intuition alone. We wrote about gathering that feedback systematically in our post on building products users actually want.

The Costs Nobody Talks About

A few line items that catch founders off guard:

Domain and DNS renewal: $10-50/year. Small, but forgetting it can take your product offline.

Compliance and legal: If you handle personal data (you probably do), GDPR or SOC 2 compliance has ongoing costs. At minimum, you need a privacy policy that stays current. Some industries require annual security audits.

Scaling costs are non-linear: Going from 1,000 to 10,000 users might double your infrastructure costs. Going from 10,000 to 100,000 might 5x them. Database query optimization, caching strategies, and CDN configuration become real work at scale.

Opportunity cost of stale features: If your competitors are shipping and you are not, maintenance mode has a hidden cost. Users expect products to improve. A product that stays static for a year starts to feel abandoned.

How to Budget: A Practical Framework

Here is the framework we recommend to founders planning their post-launch budget:

Month 1-3 (Post-Launch Stabilization):

• Hosting: $100-300/month
• Third-party services: $50-200/month
• Bug fixes: 8-12 hours/month
• Security: 2 hours/month
• Feature work: prioritize based on user feedback
• Total: $3,000-$8,000/month (higher developer hours)

Month 4-12 (Steady State):

• Hosting: $100-400/month
• Third-party services: $50-300/month
• Bug fixes: 2-4 hours/month
• Security: 2-4 hours/month
• Feature work: 10-30 hours/month (if actively iterating)
• Total: $2,000-$6,000/month

Year 2+ (Maintenance Mode):

• Hosting: $100-500/month
• Third-party services: $50-300/month
• Bug fixes: 2 hours/month
• Security: 2 hours/month
• Feature work: as needed
• Total: $1,000-$3,000/month

These numbers assume a single product with moderate complexity. A simpler marketing site or landing page would be much less. A complex platform with multiple user roles, real-time features, and integrations would be more.

How to Reduce Maintenance Costs

You cannot eliminate maintenance costs, but you can minimize them through smart choices during the build phase:

Choose managed services over self-hosted. Supabase over a self-managed PostgreSQL instance. Vercel over a manually configured VPS. You pay a premium, but you eliminate entire categories of maintenance.

Write tests for critical paths. Automated tests catch regressions before they become user-reported bugs. The investment during development pays for itself within months.

Use established frameworks. We use Astro, SvelteKit, and Flutter — frameworks with strong ecosystems and regular updates. Betting on niche tools might save time upfront but creates maintenance headaches when you cannot find developers who know them.

Document everything. When a different developer needs to fix a bug six months from now, documentation is the difference between a 30-minute fix and a 4-hour investigation. We covered this in more detail in our post on writing effective requirements documents.

Set up monitoring from day one. Error tracking, uptime monitoring, and performance alerts mean you catch problems before users report them. Proactive fixes are always cheaper than reactive ones.

The Bottom Line

Software maintenance is not optional. It is a running cost of doing business with a digital product, just like rent is a running cost of having a physical office. The founders who budget for it from the start build more sustainable businesses. The ones who do not end up with a “legacy” codebase they are afraid to touch within two years.

The good news: with the right architecture and the right team, maintenance costs are predictable and manageable. You are not signing up for chaos. You are signing up for stewardship.

If you are planning a product launch and want a realistic maintenance budget, or if you have an existing product that needs a maintenance plan, reach out at hello@threshline.com. We have been doing this for over five years and we are happy to give you straight numbers.