Age by Serial Number vs Utilkits

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

Age by Serial Number compared with Utilkits
Detail	Age by Serial Number	Utilkits
What it does	Find how old a water heater, furnace or air conditioner is from its serial number	Free browser-based tools for PDFs, images, calculators, and text that process files on your device without uploading
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free: $0 forever, all 95 single-file tools with no signup. Pro: $9/mo with 14-day free trial (no card needed), includes batch processing and live-data widgets. Teams: $29/mo with unlimited features.
Key features	Water heater serial number decoders for Bradford White, A.O. Smith, State, American, Whirlpool, Rheem, Ruud, Lochinvar Furnace and air conditioner decoders for Goodman, Amana, Lennox, Carrier, Trane, American Standard Water heater and furnace error code lookups Water heater sizing calculator for tank and tankless models Rheem water heater status light meanings Goodman furnace LED flash code reference Rinnai V53De tankless water heater code lookup Rheem tankless water heater code lookup	Live-data widgets: exchange rates, metal prices, weather, news headlines, uptime monitoring Workspace tools: invoice maker, time tracker, freelance studio
What makes it different	Independent reference not affiliated with or endorsed by any manufacturer Distinguishes manufacture date from installation date and emphasizes condition and maintenance over age Covers safety guidance including gas smell warnings and professional contractor recommendations	All files processed in browser - no uploads to servers, keeping data completely private No signup required for any free tool - instant access without account creation 104 free tools with no daily task caps or file size limits tied to plans On-device AI models that run 100% in browser without uploads or API keys Optional Pro/Teams plans fund development while core toolkit stays free forever
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)	1 no change since last check	Not checked yet no change since last check
Trust Flow (Majestic)	1	0
Citation Flow (Majestic)	17	7
Referring domains (Majestic)	4	1

4 details filled in for both companies.

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