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Use AWS Budgets to Prevent Surprise Bills in Personal Projects
A practical guide to AWS Budgets for solo developers: what it does, which thresholds to set, and how it differs from Cost Explorer.
AWS Budgets is one of the first services you should set up when building on AWS as a solo developer. Before writing any feature code, make sure you can detect billing problems early.
Conclusion
AWS Budgets sends notifications when your AWS spending gets close to a target amount or percentage. For personal projects, set a low monthly budget and trigger alerts at 50%, 80%, 100%, and forecasted 100%.
Why Set It Up First
AWS uses pay-as-you-go pricing. Even small experiments can keep generating charges if you leave resources running.
Services like NAT Gateway, RDS, ALB, EC2, and OpenSearch are common sources of unexpected costs in personal MVPs. If you have Budgets in place, you have a chance to catch anomalies early.
What Budgets Watches
In Budgets, you set a monthly cost target and receive notifications based on it. For example, set a budget of 1 USD or another low amount, and add alerts at Actual 50%, Actual 80%, Actual 100%, and Forecasted 100%.
The key point is to use a notification email address you check regularly.
How It Differs from Cost Explorer
Budgets tells you "you are about to exceed your target." Cost Explorer tells you "this service cost you this much."
When you get a Budgets alert, open Cost Explorer to break down spending by service and region.
How This Project Uses It
This site uses S3, CloudFront, API Gateway, Lambda, DynamoDB, and CloudWatch Logs. With low traffic, costs stay small, but a permanent zero-dollar bill is never guaranteed.
That is why Budgets is required from day one, so unexpected charges show up quickly.
Things to Keep in Mind
Budgets does not stop billing automatically. When an alert arrives, check the Billing Dashboard, Cost Explorer, and your active resources right away.
Delete experiments you no longer need, and avoid setting CloudWatch Logs retention to "never expire."
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