Age by Serial Number vs FormatOwl

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 FormatOwl
Detail	Age by Serial Number	FormatOwl
What it does	Find how old a water heater, furnace or air conditioner is from its serial number	A little less effort. A lot more done.
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free: 113 tools with no sign-up required, 20 welcome trials, then 3 monthly trials. Pro: $49/year (about $4.08/month) or $5.99/month, includes all 143 tools with unlimited use. Lifetime: $149 one-time payment, includes all 143 tools with no renewal.
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	Image tools: convert, edit and create images PDF tools: organize, sign and transform documents Video tools: edit clips and export videos Audio tools: convert, edit and combine sound JSON tools: format, query and compare structured data Text tools: write, count, compare and transform text Encoding tools: encode, decode and inspect text Color tools: choose, mix and check colors QR & barcode tools: create and scan codes 143 tools across 14 categories
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	100% local processing - files stay on your device 113 tools free without requiring sign-up 20 advanced tool trials plus 3 monthly trials with account creation All 143 tools available across one integrated platform No watermarks on free tool exports
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	17
Referring domains (Majestic)	4	4

4 details filled in for both companies.

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