DOC: EMW-WEB-10 / REV 2026-07-17 / STATUS: PUBLISHED

Free Tools

No sign-up required. Everything runs in your browser — nothing is sent to a server. Pick a tool below, or try our four mini games.

INCIDENT-FREE: 2,000+ days since 2021-01-01 JST — 重大障害ゼロ継続中(当社担当範囲)
Tools

All Tools

No sign-up. Everything runs in your browser — nothing is sent to a server. Pick by use case.

貼るだけDiagnostics & Audit

Paste a policy or plan to detect privilege escalation, destructive changes, and public exposure — all in your browser.

IAM Least-Privilege Analyzer

Detect wildcards and 18 privilege-escalation paths in any IAM policy.

IAM権限昇格最小権限
開く →

Terraform Plan Risk Check

Flag destroy, replace, and data-loss changes before you apply.

TerraformIaCapply前点検
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Resource Policy Exposure Audit

Catch Principal:* exposure, missing Org conditions, and HTTP access.

S3KMS公開リスク
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Security Group Reachability

Map SG-to-SG reachability and catch SSH/DB exposed to the internet.

VPCSecurity Groupネットワーク
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IaC to Diagram

Turn Terraform or CloudFormation into an architecture diagram.

TerraformCloudFormation構成図
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Calculators

SLA, availability, CIDR, migration time, cost — the numbers every design decision needs.

SLA Downtime

Convert any SLA target into allowed downtime instantly.

SLA稼働率可用性
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Composite SLA

Composite SLA of a stacked, in-series architecture.

SLA直列合成Multi-AZ
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CIDR Planner

Generate a full AWS address plan from one base CIDR.

VPCサブネット設計
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Transfer Time

Estimate migration transfer time and whether to ship disks.

移行回線Snowball
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Downtime Cost

What one hour of outage actually costs you.

可用性損失額投資判断
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Cron / TZ

Convert JST schedules into EventBridge cron (UTC).

EventBridgeUTCcron
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Guided Assessments

Answer a few questions to shape your AI placement or security baseline.

AI Placement

Find the right mix of local LLM, Bedrock, and public AI.

AIBedrockローカルLLM
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Security Self-Check

Self-check the 10 security basics we review first.

セキュリティ10項目基盤
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番外編Games

Four games for everyone in the trenches — engineers, sales, PMs, and buyers.

Night-Shift Triage Game

A 2-minute alert-triage game. Spot the root cause, let the SRE sleep, survive until dawn.

GAME障害対応2分
遊ぶ →

Sales vs PM: The Night Before

Play the same deal from either chair — sales or PM. Clear both sides to see the whole picture.

GAME営業vsPM3分
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The Buyer's Night: Vendor Select

Now you're the buyer. Write the RFP, spot the red flags, survive internal politics.

GAMERFP5分
遊ぶ →

AWS CLI Survival

The console is down. Assemble real AWS CLI commands to survive 10 missions.

GAMEAWS CLI学習
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Click a card to open a tool — or jump between them from the bar below.


AI Placement SLA Converter Composite SLA CIDR / Plan Transfer Time Downtime Cost Cron / TZ Security Check

Where Should Your AI Live?

Answer five questions to find the right mix of local LLM, Amazon Bedrock, and public AI for your company.
0 / 5

A simplified assessment. Actual architecture depends on data classification, regulations, and usage.


SLA Downtime Calculator

What does 99.9% actually allow? Convert any SLA target into allowed downtime instantly.
%
ALLOWED DOWNTIME @ 99.9%
年間(365日)
月間(30日)
週間(7日)
1日(24時間)

Example: 99.9% allows ~43 minutes per month — roughly one maintenance window. Derive your target from business impact, not habit.


Composite SLA Calculator

SLAs multiply down when you stack services in series. Pick your stack and see the composite number.
COMPOSITE SLA(直列合成の理論値)
年間の許容停止
月間の許容停止(30日)
上のプリセットを選ぶか、コンポーネントをタップしてください

What does Multi-AZ actually cost?

ComponentSingle-AZMulti-AZDelta / month
RDS
db.m5.large / MySQL
$0.235/hr ≈ $172/mo $0.47/hr ≈ $343/mo +$171 (exactly 2x)
EC2
m5.large ×1 → ×2
$91/mo $181/mo +$91 ※
ALB / Route 53 / S3 / DynamoDB Multi-AZ is built into the service ±$0

If you already run two or more EC2 instances, spreading them across AZs adds almost nothing. RDS Multi-AZ genuinely doubles instance and storage cost for the standby.

The framework: in the 3-tier example, Multi-AZ costs ~$260/month more and reduces allowed downtime from 7h15m to 30m. Roughly $40 per avoided downtime-hour — if an hour of outage costs you more than that, Multi-AZ pays for itself. That judgment call is exactly what our architecture reviews are for.

Official monthly uptime commitments (credit thresholds), not guarantees. As of July 2026. Serial composition assumes independent failures; redundancy and operational factors are out of scope. Prices are Tokyo-region on-demand estimates and vary with FX and discounts.


CIDR Calculator / AWS Address Planner

Generate a full AWS address plan — environments × subnet tiers — from a single base CIDR, AWS's 5 reserved IPs included.
ADDRESS PLAN SUMMARY

Private largest (workloads), Public small (NAT/ALB/bastion), Managed for DB/endpoints, TGW attach needs only /28. Reserved blocks are your future headroom.


Data Transfer Time Estimator

How long will that dataset take over the wire? First fork in any migration plan.
70%
ESTIMATED TRANSFER TIME
理論値(帯域100%)
1日8時間だけ流す場合

Utilization accounts for shared bandwidth, protocol overhead, and retries. Full-copy + incremental sync keeps cutover-day transfers small.


Downtime Cost Calculator

What does one hour of outage cost you? The number every availability decision needs.
円/時間
人 × 円/時(人件費)
COST OF DOWNTIME
1時間あたりの損失(売上影響+人件費)
30分の障害
4時間の障害(半日)
シングルAZとマルチAZの許容停止差
(月6時間45分・理論値)をリスク換算

Reputation damage, lost opportunities, and recovery overtime aren't included — treat this as the floor.


JST⇄UTC / Cron Converter

AWS schedules run in UTC. Convert "2 AM JST daily" into an EventBridge cron expression — including the day-shift traps.
run
EVENTBRIDGE SCHEDULE (UTC)
UTC時刻
cron式

EventBridge cron has 6 fields (min hour dom month dow year). EventBridge Scheduler supports native time zones — consider it for new schedules.


AWS Account Security Self-Check

The 10 basics we check first in every architecture review. Nothing leaves your browser.

Turn the Result into a Real Design

From data classification to governance and architecture — backed by both AWS and local LLM delivery experience.

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