Cost only tells one part of the story.
The lower price can be right while you test. The useful line is the month where storage overage changes the decision. This model makes that line explicit from your inputs.
Give your app room to grow before storage turns cheap into costly.
Use your own plan limits and growth assumptions. This is a planning model, not live provider pricing or an uptime claim.
Interactive cost model
Test with eyes open.
Compare a lower-cost test plan with a higher-capacity plan. Storage changes are saved in this browser so a reload keeps your scenario.
$0Test plan total
$0Growth plan total
0 GBStorage at end
$0Cost difference
No invented vendor data.
Prices, included storage, and growth are deliberately editable. The model makes no claim about Supabase availability, actual plan terms, or a competitor's status.
Headroom
Included storage is compared to projected usage every month.
Runway
See when each plan first crosses into overage.
Portable result
Export the useful month-by-month calculation as CSV.
| Month | Storage | Test plan cost | Test plan overage | Growth plan cost | Growth plan overage |
|---|
Capacity choices
Build for the next constraint, not the last outage.
Use the result as a transparent planning aid while you verify live pricing and reliability requirements yourself.
Start with a bounded test
Set the lowest plan you would actually pay, then choose a short horizon. The result shows whether your current storage profile fits it without surprise overage.
Model growth honestly
Use a monthly GB estimate that includes uploads, generated files, and backups that count toward your storage model.
Separate price from reliability
A calculator cannot prove service availability. Keep reliability requirements as a separate verification task with the providers you are considering.
Make the storage tradeoff visible before your users do.
Change one assumption, export the arithmetic, and keep a concrete capacity conversation with your team.