What this suite is (and is not)
TechImpact.online publishes 18 free reliability tools in one suite — no signup, no fake “Start Free Trial,” no vaporware Pro tier. Calculators and generators run entirely in your browser. Checkers call a simple API from our server when you click; they are single-location smoke tests, not replacement products for multi-region monitoring.
We are not trying to clone every feature of Site24x7 or Datadog. The suite follows two deliberate lanes: Hyperping-style operational utilities (post-mortems, cron, status pages, uptime/SSL/DNS checks) and our reliability-in-money wedge (SLA math, downtime dollars, error budgets, RTO/RPO, vendor claim packs). Every outage should be able to answer “what did it cost?” and “what SLA or credit lesson?” — not just “was ping green?”
Money & planning vs generators vs smoke checks
Money calculators turn uptime promises and outage minutes into numbers leadership understands: allowed downtime, error budget burn, revenue loss estimates, ROI of redundancy spend. Start in the Reliability Money Toolkit if that is your job.
Generators produce documents and assets: Markdown post-mortems, SLA claim text, cron strings, downloadable status HTML. They save formatting time during incidents — they do not detect failures automatically.
Smoke checkers answer narrow questions from outside your network: is this URL up, is TLS expiring, what do DNS records show, does /health return 200, is origin TTFB sane? Use them after deploys or during triage; schedule real monitoring separately.
Which tool first? — decision guide
Pick the row that matches your situation:
- Just had a customer-impacting outage: Downtime Cost → Error Budget or Allowed Downtime → Post-Mortem. Vendor fault? Add Claim Pack.
- Negotiating uptime target or nines: Cost of Nines + Allowed Downtime + uptime reference.
- Budget request for monitoring or redundancy: Reliability ROI with incident history assumptions.
- Disaster recovery planning: RTO/RPO Impact + DR basics guide.
- Need customer-facing incident comms: Status Page Builder or Free Status Page Download — update manually during incidents.
- Post-deploy sanity from outside: Availability → SSL → REST API as needed.
- Domain or cert migration: DNS Analysis then SSL and availability checks.
- Scheduled job reliability: Cron Generator + external heartbeat (availability checker on success URL).
When to use the full catalog vs the Money Toolkit hub
The Reliability Money Toolkit is the curated path for SLA and downtime math with guides and shareable scenario URLs. This page is the complete catalog including generators and checkers. Bookmark both: Toolkit for recurring finance/SRE workflows; Free Tools when you need a generator or smoke check in one click.
All tools are free today. We do not sell your data or require accounts. Checkers are intentionally limited — we say so on every checker page because false confidence hurts more than honest scope.
Tool count and maintenance
We ship 18 tools today — calculators (8), generators/document tools (6), smoke checkers (5). Each page includes methodology, worked examples, and FAQ so you are not landing on a bare widget. We add tools when they fit the money + ops wedge; we do not clone entire enterprise monitoring suites.
Audience-specific starting paths
Founders / GM: Downtime Cost + Reliability ROI + one status page URL live before next launch.
SRE / platform: Error Budget + Allowed Downtime + smoke checkers in deploy runbook.
Finance / procurement: SLA Penalty Calculator + Claim Pack + calendar month reference tables.
Support / CS: Status page tools + link to official URL in macros; escalate with downtime minutes from Allowed Downtime when SLA promises exist.
Developers: Cron generator, REST API checker, DNS tool — keep bookmarks for triage after deploy.
None of these paths require payment or signup today. When we ship optional paid features in the future, core calculators will stay free — we will label pricing honestly on the site, not hide it behind trial CTAs.
Internal linking map (how tools connect)
Money calculators share math with reference guides. Generators link forward to post-mortems and claim packs after incidents. Checkers link backward to DNS and SSL when triaging “site down” reports. The Toolkit hub is the recommended entry for finance; this catalog is the entry for ops engineers bookmarking one bookmark per tool type.
Glossary (quick)
SLA — customer contract uptime. SLO — internal target, often stricter. Error budget — allowed failure before SLO miss. Smoke test — single external check, not monitoring. Post-mortem — blameless incident write-up. Claim pack — structured vendor credit request. Tools map to each term above.
Money & planning calculators
Turn uptime promises and outage minutes into budgets your team can debate. See also the Reliability Money Toolkit for curated paths.
SLA Penalty Calculator
Estimate tiered service credits when actual uptime falls below a promised percentage.
Website Downtime Cost Calculator
Model revenue loss, refunds, conversion drop, and idle staff cost from an outage duration.
RTO / RPO Impact Calculator
Compare recovery time and data-loss windows against business impact.
Allowed Downtime Calculator
Convert SLA uptime % into allowed minutes — or reverse downtime into achieved uptime.
Cost of Nines Calculator
See what each extra nine costs in minutes and compare investment vs risk.
Error Budget Calculator
SLO target + period → error budget minutes; track burn % when you log incidents.
Reliability ROI Calculator
Compare reliability investment cost against avoided downtime dollars.
Generators & document tools
Produce claim packs, post-mortems, cron schedules, and status pages you can copy or download.
SLA Credit Claim Pack Generator
Vendor, period, promised %, downtime, and evidence notes → structured claim text.
Post-Mortem Generator
Fill incident fields → Markdown post-mortem with timeline, root cause, and actions.
Cron Expression Generator
Build or parse cron schedules with plain-English explanation and presets.
Status Page Builder
Live preview + download a standalone HTML status page for your services.
Status Page Templates
Minimal, dark ops, customer-friendly, and multi-service starter templates.
Free Status Page Download
Customize branding and download a ready-to-host static status.html — no backend.
Smoke-test checkers
Quick checks from our server. Not multi-region monitoring — honest limits, useful for spot checks.
Website Availability Checker
HTTP status, ok/fail, and latency in milliseconds for any public URL.
Webpage Speed Smoke Test
TTFB and total load time — a lightweight smoke test, not full Lighthouse.
How to use this suite over time
Reliability tooling fails when it is only bookmarked during disasters. A practical rhythm:
- Baseline quarterly: Run Allowed Downtime and Error Budget for your published SLO. Save screenshots or shareable URLs.
- Before major releases: Smoke-check staging/production health URLs, SSL expiry, and critical DNS records.
- After incidents: Downtime Cost → Post-Mortem → optional Claim Pack. Link numbers in the post-mortem impact section.
- During budget season: Reliability ROI and Cost of Nines for investment conversations — use low/mid/high inputs.
- Before you need it: Publish a static status page URL even if updates are manual — see Status Page Builder.
Worked scenario — vendor outage afternoon
14:00 — Cloud provider incident affects your API. Status page updated manually.
15:30 — Service restored. Downtime Cost: 90 min × $6k/hr peak ≈ $9k impact range.
16:00 — Error Budget: 90 min burn on 99.9% monthly SLO → over budget.
Next day — Post-Mortem published; Claim Pack emailed to vendor with UTC evidence.
What we deliberately do not offer (yet)
- Hosted uptime monitoring with multi-region probes and paging.
- Paid Pro saves, team workspaces, or PDF export gates.
- Embeddable widgets or white-label API — link to tools instead.
Guides live under Guides and link back to tools. Questions or broken checks: Contact.