Free tools
No signup. Nothing uploaded. Just answers.
Seven tools, free to run right now. Two read your own AWS output and answer entirely in your browser; the rest estimate off a fleet size, or a picked instance size, in seconds. Pick the one that matches what you're trying to find out.
Start here
Pick the situation closest to yours.
“I own reservations and don't know when they lapse”
Run Expiry Check →
“I don't know how much of my fleet is covered”
Run Coverage Check →
“I need a number for a budget conversation”
Run Savings calculator →
“I need the fleet-wide cost of renewals slipping by a few days”
Run Renewal exposure →
“I need to justify this internally, in writing”
Run Business case builder →
The seven tools
What each one needs, and what you get back.
Coverage Check
Runs in your browserWhat are you not reserving?
You provide
Your running fleet and your Reserved Instances: six aws describe-* commands, pasted as-is.
You get back
- Real coverage percentage
- Uncovered capacity, priced
- Idle reservations already costing you money
- What closing the gap is worth per year
about a minute
Expiry Check
Runs in your browserYour real renewal calendar. Right now.
You provide
Your existing Reserved Instances: three aws describe-reserved-* commands, pasted as-is.
You get back
- Exact expiry dates for every reservation
- What a lapse costs per hour, day, and year
- A downloadable .ics calendar with 90/30/7-day reminders
- A CSV export
under a minute
Savings calculator
What Reserved Instances are worth to you.
You provide
A fleet size preset or a monthly spend slider. No AWS data needed.
You get back
- Estimated annual savings
- Payback period and return multiple
- What a missed renewal would cost
- A shareable link with your numbers baked in
under a minute
Renewal exposure
What a missed renewal costs your whole fleet.
You provide
A fleet size preset and how many days a renewal typically slips. No AWS data needed.
You get back
- Fleet-wide annual exposure to slipped renewals
- The cost of a single missed renewal, at your scale
- What one flat price would cover
under a minute
Business case builder
Something to send to whoever signs.
You provide
A fleet size preset and two sliders. No AWS data needed.
You get back
- A print-ready document: the situation, the cost, the ask, and the return
- The exact math behind every figure, not a summary of it
- Answers to the questions finance, security, and procurement raise
- A shareable link that restores the same numbers on open
under a minute
Size flexibility calculator
One reservation of this size covers what, exactly?
You provide
A service, family, and size, picked from what AWS actually sells. No AWS data needed.
You get back
- The exact equivalence ladder for that size, e.g. one xlarge = 2 large = 4 medium
- The RDS Multi-AZ factor, doubled correctly
- The full AWS normalization-factor table, sourced
- Where size flexibility does not apply, by service
under a minute
Term Check
One year or three? Upfront, or not?
You provide
A service, family, size, region, and how many months you plan to keep the instance. No AWS data needed.
You get back
- Upfront cash and total commitment cost for every term and payment option
- Net saving or loss over your own horizon, priced from the committed rate card
- The real break-even runtime, not just the upfront payback
- The winning option at your horizon, named plainly, or an honest 'on-demand wins' result
under a minute
The trust part
Nothing you paste leaves your browser.
The Coverage Check and Expiry Check parse, match, and price your own AWS output entirely on your device, and neither writes to localStorage or the URL. The Coverage Check fetches one small, public price list from this site on your first Analyze, and that request carries no trace of your paste. The Expiry Check makes no network request at all. Don't take our word for it. Open DevTools' Network tab and watch it yourself.
At your size
Same tools, whatever your fleet looks like.
The math and the tools are identical from a single account to thousands of reservations. Only which one to run first changes.
1–10 reservations · a single account
Run Expiry Check first
$10,530 est. annual savings
See the startups fit →dozens of reservations · a few accounts
Run Coverage Check first
$105,300 est. annual savings
See the growth teams fit →hundreds to thousands · many AWS accounts & orgs
Run Renewal exposure first
$1,053,000 est. annual savings
See the enterprise fit →Go deeper
The RI Discount Index
Original research: what Reserved Instances actually discount, by term, payment option, and region.
RI Price Library
Real AWS Price List figures, one page per instance type.
Glossary
Plain-language definitions of every reservation term.
Guides
Playbooks on renewals, coverage, and savings.
Free tools, answered
Questions about the tools.
Is this really free?
Yes. All seven tools are free, with no signup, no credit card, and no time limit. They exist to earn trust before you ever connect an AWS account. No lead form. No gate.
Do you keep my data?
For the Coverage Check and Expiry Check, nothing you paste is uploaded. You paste your own AWS CLI output, and the parsing, matching, and pricing all run in your browser. The Coverage Check also pulls down a small, public price list from this site the first time you click Analyze, cached after that; the request never includes anything you pasted. The Expiry Check makes no network request at all. The Savings calculator and Renewal exposure estimator never see your AWS data in the first place. They run entirely off a fleet-size preset or the sliders you move. More on what we collect.
What does Reserver do that these don't?
Each of these tools is a one-shot manual snapshot: you run a command or move a slider, and get an answer for that moment. Reserver connects once with a read-only role and scans continuously. It matches reservations to what's actually running as your fleet changes, and flags a renewal before it lapses instead of after you happen to check.
Stop overpaying for a steady fleet.
Reserver is in early access. Join the list and we'll onboard you as capacity opens up. Your first recommendation lands within minutes of connecting.