に連(つ)れてAs…then, In proportion to, (Along) with

Both express change in tandem and can often be used interchangeably. にしたがって frames it as happening 'in accordance with' another, while につれて emphasizes gradual, proportional change. For example, '話すにしたがって、だんだん打ち解けてきた' and '話すにつれて、だんだん打ち解けてきた' have nearly the same meaning.

につれて describes changes that occur in proportion to each other, as one progresses, the other does too. と, on the other hand, is a conditional particle used when one event naturally or habitually leads to another. Unlike につれて, と does not imply a proportional relationship between the events.

につれて and に伴って・に伴い both express one thing happening as a result of or alongside another. につれて emphasizes gradual and proportional change, e.g. '年を取るにつれて体力が落ちる' ('As I age, my stamina declines'). に伴って・に伴い can also be used with one-time or habitual events, e.g. '津波は地震に伴い発生する' ('Tsunamis occur together with earthquakes').

Both につれて and ともなると・にもなると describe changes that arise with conditions, but differ in nuance. につれて describes gradual, parallel change over time, e.g. '年を取るにつれて体力が落ちる' ('As I age, my stamina declines'). ともなると・にもなると marks a turning point or elevated situation, e.g. '社長ともなると責任が重い' ('Once you become a company president, the responsibility is heavy').

と共に and につれて are similar in that both can be translated as 'together with', but differ in nuance. と共に can express simultaneous actions or states, or the idea of accompaniment, e.g. '厳しいと共に優しい' ('kind as well as strict'). につれて highlights proportional change over time, e.g. '年を取るにつれて体力が落ちる' ('As I get older, my stamina declines').