---
title: 'ParkMyAWS vs DIY Lambda + EventBridge Scheduling'
description: 'A detailed comparison of building your own AWS scheduling with Lambda and EventBridge versus using ParkMyAWS. Feature comparison, total cost of ownership, and when DIY makes sense.'
date: '2026-02-18'
readingTime: '5 min read'
---

## The DIY Temptation

Scheduling EC2 and RDS instances feels like a weekend project. AWS hands you the parts: Lambda runs essentially free at low volumes, and EventBridge does cron natively. You wire them together, watch your dev boxes shut down at 7pm, and feel clever.

The prototype is real. One account, one region, a couple of instances. It works. What it does not tell you is how the thing behaves a year later, after the org has grown to a dozen accounts, someone changed an IAM policy, and an RDS instance got stuck mid-reboot at 6am while the Lambda silently retried into nothing. The gap between that first demo and scheduling you can trust across the whole organization is where the cost lives.

## Feature Comparison

Here is how a DIY Lambda + EventBridge solution stacks up against a managed tool like ParkMyAWS.

| Feature          | ParkMyAWS                          | DIY (Lambda + EventBridge) |
| ---------------- | ---------------------------------- | -------------------------- |
| Setup time       | 5 minutes                          | 2-4 weeks                  |
| Maintenance      | Fully managed                      | You maintain everything    |
| Multi-account    | Built-in                           | Deploy per account         |
| Multi-region     | Any region from dashboard          | Configure per region       |
| Failure handling | Automatic retries + alerts         | Build your own             |
| Monitoring       | Dashboard + notifications          | CloudWatch setup required  |
| Schedule changes | One click                          | Redeploy code              |
| Edge cases       | Handled (pending states, Multi-AZ) | You discover them          |

## Total Cost of Ownership

On the AWS bill, DIY looks free. Lambda and EventBridge round down to nothing at this volume. That line item is not where the money goes.

The cost is the build, then the upkeep. Two to four weeks to get a production version standing: IAM roles wired up per account, retry logic that handles the half-states AWS actually returns, CloudWatch dashboards so you can see when a schedule misfires, alarms so you find out before a customer does. Then it sits there. Every new account is another deploy. Every AWS API change is a thing that might quietly break at 3am. Nobody owns it, so it rots until the night it does not fire and a production database stays up all weekend.

A managed tool like [ParkMyAWS](https://parkmyaws.com) is a flat monthly fee with that work already done. Setup is 5 minutes instead of weeks, and for most teams the subscription costs less than the developer hours you would burn maintaining the homegrown version.

## When DIY Makes Sense

Sometimes building it yourself is the right call. If you run one account with a handful of instances in a single region, the edge cases barely come up and the Lambda is genuinely small. If your team likes owning infrastructure and has the bandwidth to keep owning it next quarter, the maintenance tax is a price you are willing to pay. Under those conditions, go ahead. The moment any of them stops being true is the moment a managed tool starts earning its fee.

## The Bottom Line

You can absolutely build EC2/RDS scheduling yourself. The real cost is not the building. It is the year of quiet maintenance afterward that nobody signed up for. Most teams that have lived through that year decide their engineers have better things to do, especially once the managed alternative costs less than an hour of their time each month.