DH Tools vs Age by Serial Number

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

DH Tools compared with Age by Serial Number
Detail	DH Tools	Age by Serial Number
What it does	46+ free online tools for PDFs, images, code, and utilities that process locally in your browser without uploading files to servers	Find how old a water heater, furnace or air conditioner is from its serial number
Stage	Startup	Not given
Founded	2026	Not given
Based in	TR	Not given
Pricing model	Freemium	Free
Pricing	All 46 core tools are free with unlimited daily usage. Optional VIP PRO membership available for unlimited AI OCR, ad-free experience, 10x hardware acceleration, and priority server bandwidth.	Not given
Key features	PDF compression up to 85% file size reduction PowerPoint to PDF conversion (PPTX/PPT) PDF to image conversion (PNG, JPG at 300 DPI) AI OCR to extract tables from images to Excel PDF merging and combining Batch image compression (20+ photos simultaneously) AI background remover for photos JSON formatter and validator QR code generator for URLs, Wi-Fi, text IP lookup and geolocation mapping	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
What makes it different	All 46 core tools permanently free with no registration required Direct alternative to subscription-based utility websites Supports files up to device RAM capacity with no artificial limits	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
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 −1 (down) since last check	1 no change since last check
Trust Flow (Majestic)	1	1
Citation Flow (Majestic)	30	17
Referring domains (Majestic)	52	4

4 details filled in for both companies.

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