Change one parameter. Watch costs cascade through your entire architecture. That's what CloudCostFlow does — and no other tool can.
A simple, common architecture — CloudFront serving content from S3. Same setup, two different traffic levels. Look at how costs change when you understand the connections.
| Input Parameters | |
|---|---|
| Monthly requests | 10,000,000 |
| Cache hit rate | 92% |
| GET / PUT ratio | 95% / 5% |
| Avg payload size | 250 KB |
| Stored objects | 50 GB |
| Input Parameters | |
|---|---|
| Monthly requests | 100,000,000 |
| Cache hit rate | 97% |
| GET / PUT ratio | 95% / 5% |
| Avg payload size | 250 KB |
| Stored objects | 50 GB |
10× the traffic didn't mean 10× the cost. It meant 9.6× the cost — because the cache hit rate improved from 92% to 97%, meaning fewer origin fetches per request. Cost per million requests actually dropped from $22.50 to $21.63. S3 origin requests only went from 800K to 3M (3.75×, not 10×).
And the thing no spreadsheet tells you: S3→CloudFront data transfer is free. That single fact saves hundreds per month at scale. CloudCostFlow knows this because it models the connection, not just the services.
These are the inputs other tools ignore — and they're the ones that determine whether your architecture costs $200/month or $2,000.
Every 1% improvement in cache hit rate reduces origin requests, S3 GETs, and data transfer. At 100M requests, going from 95% → 97% saves 2M origin hits.
S3 PUT requests cost 10× more than GETs ($5.00 vs $0.40 per million). A write-heavy workload has fundamentally different economics.
This is the biggest cost lever. CloudFront data transfer is priced per GB. Doubling payload size doubles your data transfer bill — the largest line item.
S3→CloudFront is free. S3→Internet is $0.09/GB. Same data, same bytes — but the connection determines the price. This is why graph-based modeling matters.
Add services. Connect them. Set traffic entry points — "10M requests hit CloudFront."
Cache ratios, payload sizes, read/write splits, instance types. The inputs that actually determine your bill.
Slide one parameter. Watch every connected service recalculate. See the full cost impact instantly.
The CloudFront → S3 example above? You can build it right now. Change the numbers. See what your architecture actually costs.
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