In hindsight / With hindsight / On hindsight
Regional usageUse in hindsight or with hindsight. Avoid on hindsight in formal Singapore workplace writing.
In hindsight
Use when
You reassess an earlier decision using knowledge gained later.
Example
“In hindsight, the implementation period was too short for meaningful user testing.”
With hindsight
Use when
You use the standard British alternative for reassessing an earlier decision with later knowledge.
Example
“With hindsight, the team should have tested the fallback process earlier.”
On hindsight
Use when
Avoid this form in formal standard English; use in hindsight or with hindsight.
Example
“Replace 'On hindsight, the timeline was unrealistic' with 'In hindsight, the timeline was unrealistic'.”
Quick check
on hindsight, upon hindsight, hindsight used to imply that an outcome was obvious at the time
Usage note