AWS Lightsail Cost Saver

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Live demo: ls.1ms.dog. Open it and go, no sign-up.

If you run anything traffic-heavy on Lightsail, you've probably had one scary bill. Once a plan's included transfer runs out, overage costs $0.09/GB, about $92 per TB. Yet a $5 IPv6 instance comes with 2 TB of transfer, which works out to $2.50 per TB. Same terabyte, more than 30× the price.

What many people miss: Lightsail instances of the same size in the same region share one transfer pool. In a busy month you can add a few small instances and the pool grows with them; when traffic drops, delete them. Billing is hourly, so nothing is wasted.

The hard part is doing the math. Will you go over this month? By how much? How many instances should you add, and when? How is a mid-month instance's allowance prorated? Can overage you've already hit be undone? The answers are scattered across AWS docs and forum threads, and it's easy to get them wrong by hand.

This tool does that math for you. Enter what you've used so far this month, or just your expected monthly total, and it tells you:

• Whether this month is safe: safe, overage expected, or already over, and how much extra you'd pay
• When the allowance runs out, so you know how long you have to act
• The cheapest number of traffic instances to add, added to your setup with one click
• What to run next month at the current pace

No sign-up. Open it and go; your data stays in your own browser. Available in 10 languages, each its own pre-rendered page (for example /zh-cn/ and /ja/), with light and dark themes, and it works on phones.

More from 1ms.dog, all free and open source (hover a name to see what it answers)

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Speed & connectivity: 1ms.dog · Network X-Ray · Speed Test · DNS Test · Domain X-Ray · IPv6 Test · CDN Radar · Reach Check · Network Diagnosis · Route Trace · Global Ping

Cloud & costs: Me2Cloud · Cloud Cost Planner

Command line: httpslatency · vps2cloud · dnstest

Features

Area	What it does
Status banner	One glance: Safe, Overage expected or Over allowance, with the dollar amount and when the allowance runs out
Usage input	Type this month's total, or fill in the two bill items TotalDataXfer-In-Bytes and TotalDataXfer-Out-Bytes and they're added up
Forecast bar	Usage so far, the projected rest of the month, the allowance line and anything past it
Scale-up plan	Compares adding 0, 1, 2… traffic instances (instance cost + overage) and adds the cheapest with one click
Base instance	Pick a plan by monthly price; each card shows transfer and cost per TB, with the cheapest marked
Traffic instances	Always the same size as the base and IPv6-only (cheapest, and pooled with a dual-stack base); start and delete times per batch
Next month	Suggests base + N instances for next month at the current pace
Checks	Warns when a forecast is below usage or a deletion time is before creation; imported backups are sanitized

Two calculation modes

Mode	When	How it works
Actual usage	You entered usage	Daily pace is measured from the first instance's start; overage already incurred can't be offset; new instances are prorated from the next full hour
Full-month plan	Only a month-end forecast	Nothing before today counts as used; every running instance counts for the whole month, so the answer is "how many for the full month"

This is the beginning of the README. Read the rest at the original. Read the full README ↗