FormulaSignal vs SleepFox

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

FormulaSignal compared with SleepFox
Detail	FormulaSignal	SleepFox
What it does	Monitor supplement formula changes with dated label history	Did I snore, when, and how bad?
Stage	Startup	Not given
Founded	2026	Not given
Based in	US	Not given
Pricing model	Freemium	Freemium
Pricing	Free Locker: up to 24 saved products with no card required. Signal Pro: $29.99/year (or $3.99/month), includes monitoring for up to 10 products checked daily with email alerts for confirmed changes and monthly Stack Brief.	Campfire Lite: Free. Forever Den: $9.99 (one-time payment).
Key features	Free Locker holds up to 24 supplements with dated labels Daily monitoring of up to 10 products Email alerts when formula changes are confirmed Before You Reorder comparison of saved and current labels 561 product listings from 65 brands Signal Verified labels read and dated twice independently Product Ask feature for ingredient and formula questions Category Ledger for supplement brands REST API and MCP server for developers	On-device snore detection with machine learning model Snore Score and timeline of snoring events Playback of snore clips Last 7 nights history (Lite) or unlimited history with trends (Den) PDF and audio export for doctor sharing Fox Nudge gentle buzz alert after 2 minutes of snoring Health Connect sync and home-screen widget
What makes it different	Every number carries a date and source No paid placement and no brand influence Independent and founder-led company	No account, no subscription, no ads required All audio processing happens on your phone with no uploads Pay once, keep forever pricing model Android app has no internet permission for privacy
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	5 −1 (down) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	6	0
Citation Flow (Majestic)	24	0
Referring domains (Majestic)	22	0

5 details filled in for both companies.

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