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FormulaSignal vs Calk

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 Calk
DetailFormulaSignal logo FormulaSignalCalk logo Calk
What it doesMonitor supplement formula changes with dated label history The calorie counter you don't have to live in
StageStartup Startup
Founded2026 2026
Based inUS IL
Pricing modelFreemium Freemium
PricingFree 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. Core tracker free forever (food logging, targets, weight entry, weight trend). Annual subscription $49.99/year for daily advice and monthly reports (first month free).
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
  • Monthly Nutrition Report with meal analysis
  • Weight trend chart
  • Variety Map showing food diversity
  • Offline food and weight logging
  • No ads or tracking
  • Calorie and macro targets
  • Daily advice and recommendations
  • No kitchen scale required
  • Shareable seven-day Variety Map
What makes it different
  • Every number carries a date and source
  • No paid placement and no brand influence
  • Independent and founder-led company
  • Food logging with a defined endpoint instead of permanent daily tracking
  • Changes to familiar meals instead of restrictive diets
  • Focus on meal composition over portion reduction
  • Transparent data handling with no third-party tracking
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)5 −1 (down) since last check8 no change since last check
Trust Flow (Majestic)614
Citation Flow (Majestic)2424
Referring domains (Majestic)2231

8 details filled in for both companies.

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