These are the listings closest to Native Script Caller in what they say they do. Comparable, not endorsed: the ranking is the catalog's, and the judgement is yours.
User ScriptsDescribes nearly the same job, smaller audience · More sites but fewer permissions than the original31 usersCompare side by side
fumiDescribes nearly the same job, smaller audience · More sites but fewer permissions than the original6 usersCompare side by side
ScriptAutoRunner3Describes nearly the same job, smaller audience · More sites but fewer permissions than the original327 users★ 5.0Compare side by side
Js-InjectionDescribes nearly the same job, smaller audience · More sites but fewer permissions than the original33 usersCompare side by side
Comparable listings are pre-computed from the meaning of each store listing, then shown with the audience and rating from our latest pass over the store. Access compares where each listing can run (every site, how many site patterns) and how many browser permissions it declares, against the extension it would replace. Narrower is not a verdict on safety: compare what each needs for the job.