Compare
What you're weighing Reserver against — and where each one breaks.
Four ways teams track AWS Reserved Instances today: doing nothing, a spreadsheet and a calendar reminder, AWS Cost Explorer, and tools that take a cut of what they find. Here's where each one genuinely fits, where it breaks, and why Reserver is priced differently from all of them.
The full matrix
Same capabilities, side by side.
"Doing nothing" has no capabilities or pricing model to compare, so it's covered in the prose below instead of its own column — everyone else is matched capability by capability.
| Capability | Spreadsheet + calendar | AWS Cost Explorer | %-of-savings tools | Reserver |
|---|---|---|---|---|
| Matches reservations to what's actually running | ✗ | ~ | ~ | ✓ |
| Flags expiries before they lapse | ~ | ✗ | ~ | ✓ |
| Re-buys renewals automatically | ✗ | ✗ | ✗ | ✓renewal autopilot |
| Shows the exact purchase math | ✗ | ~ | ~ | ✓term, payment, break-even, $/yr |
| Buys reservations for you | ✗ | ✗ | ~ | ✓RDS, ElastiCache, EC2 — one place |
| One coverage view across many accounts | ~ | ~ | ~ | ✓AWS Organizations |
| Price stays flat as you grow | ✓ | ✓ | ✗ | ✓never a cut of your savings |
Spreadsheet + calendar
- ✗Matches reservations to what's actually running
- ~Flags expiries before they lapse
- ✗Re-buys renewals automatically
- ✗Shows the exact purchase math
- ✗Buys reservations for you
- ~One coverage view across many accounts
- ✓Price stays flat as you grow
AWS Cost Explorer
- ~Matches reservations to what's actually running
- ✗Flags expiries before they lapse
- ✗Re-buys renewals automatically
- ~Shows the exact purchase math
- ✗Buys reservations for you
- ~One coverage view across many accounts
- ✓Price stays flat as you grow
%-of-savings tools
- ~Matches reservations to what's actually running
- ~Flags expiries before they lapse
- ✗Re-buys renewals automatically
- ~Shows the exact purchase math
- ~Buys reservations for you
- ~One coverage view across many accounts
- ✗Price stays flat as you grow
Reserver
- ✓Matches reservations to what's actually running
- ✓Flags expiries before they lapse
- ✓Re-buys renewals automatically — renewal autopilot
- ✓Shows the exact purchase math — term, payment, break-even, $/yr
- ✓Buys reservations for you — RDS, ElastiCache, EC2 — one place
- ✓One coverage view across many accounts — AWS Organizations
- ✓Price stays flat as you grow — never a cut of your savings
Alternative by alternative
Where each one fits, and where it breaks.
None of these are strawmen — each is a reasonable choice for someone. Here's who they're genuinely right for, and the point at which they stop being enough.
Doing nothing (staying on-demand)
Who uses itTeams who haven't gotten to reservations yet, or whose fleet is still too new to commit to a term.
Where it fitsA fleet that's genuinely still finding its shape — sizes and classes changing week to week, nothing has run long enough to trust a 1- or 3-year commitment.
Where it breaksThe moment any instance class holds steady for more than a few weeks, on-demand becomes the most expensive way to run it — the reserved rate is up to 72% lower (EC2), and you pay that gap every hour for as long as nobody acts.
Spreadsheet + calendar reminder
Who uses itSmall teams with a handful of reservations and one person who owns tracking them.
Where it fits1–10 reservations, one account — genuinely fine as long as that one person stays, and stays on top of it.
Where it breaksIt has no idea what's actually running. A second account, an instance resize, or one person's vacation, and expiries slip silently — the calendar only reminds you of what someone remembered to put on it.
AWS Cost Explorer
Who uses itTeams already deep in the AWS console who want recommendations without adding a vendor.
Where it fitsA rough read on where more reservations would help, reusing data AWS already has, at no extra cost.
Where it breaksIt recommends without matching to what's actually live per account, with no expiry radar, no purchase workflow, and no single view across an AWS Organization — reconciling its numbers with reality stays your job, every month.
%-of-savings tools
Who uses itLarger fleets that want purchasing run end to end and are comfortable paying for the outcome.
Where it fitsComplex, high-spend estates where dedicated purchasing expertise is worth a real cut of what it finds.
Where it breaksThe bill rises with your savings, forever — a good year for your AWS bill is a better year for theirs. Reserver charges the same flat price whether it finds ten thousand dollars or ten million.
Where you're starting from
Everyone starts on one of the four above. Reserver is where you end up.
Usually starts with a spreadsheet and a calendar reminder.
Once tracking reservations by hand gets error-prone, or a second AWS account shows up, Reserver takes it from here.
GrowthDozens of reservations across a few accounts — Autopilot, one flat price.Usually starts with AWS Cost Explorer plus a monthly manual review.
Once coverage needs checking weekly instead of monthly, or renewals start slipping between reviews, Reserver takes it from here.
EnterpriseHundreds to thousands, many accounts and orgs — same product, custom terms.Usually starts with a mix of Cost Explorer and a %-of-savings tool.
Once the %-of-savings bill starts rising faster than the fleet itself, or procurement wants one flat number instead of a cut, Reserver takes it from here.
What waiting costs
Doing nothing isn't neutral — it's the most expensive option on this page.
Reserved Instances don't auto-renew. The moment a term ends, the price silently reverts to on-demand and stays there until someone notices — nothing in the AWS console interrupts you to say so.
Flat price, vs. a cut of what's found.
Illustrative: the Growth preset from the savings calculator; percentage-of-savings pricing varies by vendor. Run it against your own spend →
Questions
Fair questions, straight answers.
Isn't Cost Explorer enough?
Cost Explorer tells you a number and leaves you to reconcile it across three consoles. Reserver matches every reservation to a running instance, shows its work, flags the gaps and expiries, and then makes the purchase a button — or a rule.
Why not just a spreadsheet?
A spreadsheet works fine until someone's on leave, an account gets added, or an instance gets resized — then it has no way to know. Reserver reads what's actually running and what you actually own, continuously, so nothing depends on a row someone forgot to update.
Why flat price instead of a percentage of savings?
Percentage-of-savings pricing means your vendor profits most when your bill was worst. We'd rather just charge for the software, at one flat price that doesn't rise as your savings do.
Is it worth it for only a few reservations?
Usually, yes. Even a single reservation renewed a couple of weeks late typically costs more than a year of Reserver — Watch is free during early access, and Autopilot is a flat $149/month whether you're tracking ten reservations or ten thousand.
Stop overpaying for a steady fleet.
Reserver is in early access. Join the list and we'll onboard you as capacity opens up — first recommendation within minutes of connecting.