Decay.day
Find What Is Losing Value Over Time
Pages go stale. Links break. Assets lose value. Knowledge fades. Decay.day turns invisible loss into numbers, scores, and next actions.
01
See the decay
02
Measure the loss
03
Decide the next action
Start with the tools that find loss first
Content Decay Checker
Find pages losing SEO value and get a refresh priority.
Check content decayBroken Link Checker
Check URLs for dead links, redirects, and HTTP errors.
Check broken linksDepreciation Calculator
Estimate current value, annual depreciation, and value left.
Calculate depreciationForgetting Curve Calculator
Estimate memory retention and the next review window.
Estimate retentionExplore by decay type
Website Decay
Find pages, links, and content that are losing value.
Content Decay Checker
Find pages losing SEO value and get a refresh priority.
Check content decayBroken Link Checker
Check URLs for dead links, redirects, and HTTP errors.
Check broken linksContent Decay
Learn what content decay means and how to fix it.
Read guideLink Rot
Learn why links break over time and how to repair them.
Read guideValue Decay
Measure how much value is left over time.
Memory Decay
Estimate retention and review timing.