Deterministic Utilities + Automated Sentinels
The real math of your digital business.
Zero dashboards, 100% signal.
Free instant tools to calculate break-even ROAS, audit UTMs, and check tracking health. One $29/mo background sentinel that alerts you via Email & Push before you leak capital.
sentinel.log — live
05 events
Free deterministic utilities
No account, no tracking pixels, no upsell walls. Just math that runs in your browser.
01
Free / No Auth
Break-Even ROAS Calculator
Calculate exact CAC limits and product contribution margins.
Open tool →
02
Free / No Auth
UTM Builder & Inspector
Sanitize URLs with native ad macros and test HTTP status.
Open tool →
03
Free / No Auth
CAC/LTV & Payback Estimator
Simulate monthly payback curves and cumulative cash valleys.
Open tool →Dashboard bloat vs. background signal
The same problem, two very different working days.
The old way
✕
Heavy dashboards that take 20 minutes to load a number you already knew.
✕
Fourteen tabs open across Meta, Google, Shopify, Stripe and GA4.
✕
Broken tracking discovered weeks later, after the budget is spent.
✕
Custom GA4 event schemas nobody on the team can maintain.
The flowsk way
✓
Simple deterministic inputs for the daily math — open, type, decide.
✓
One tab. The tool does one job and gives you one number.
✓
Automated background crawls catch broken pixels the same day.
✓
Email and push alerts the moment unit economics turn red.
Flowsk Signals — the micro-SaaS
Stop logging into 10 platforms just to check if you're making money.
Signals runs in the background and only speaks when something breaks. No dashboard to check, no OAuth to maintain.
UPT
Tracking Uptime
Daily headless crawl of your checkout pages and pixel fires.
ING
No-OAuth Ingestion
Forward daily platform exports to ingest@flowsk.com. Zero API keys required.
ROI
Margin Breakeven Alerts
Instant web push when blended ROAS falls into the red.
DNS
DNS & Deliverability Diff
Instant alert if your DMARC or DKIM records change.
$29
/ month
Flat rate. Cancel anytime.
✓
All monitors included
✓
Email + Web Push alerts
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Unlimited domains
✓
Zero setup fees
No setup fees · No API keys · One email at launch