The best replacement for dd7 is dd3.

The best alternatives to dd7 are rated as following:
★★★★★  dd3
★★★★  dd5
★★★★  dd 20
★★★★  carbon copy
★★★★  dd6
★★★  flashback
★★  nova delay
★★  dl8
★★  dd20
★★  echo park
★★  flashback delay
★★  boss dd20
★  memory man
★  nova repeater
★  memory boy
★  digidelay
★  mxr carbon copy

Your alternative for dd7 is not listed? Suggest!
Speaking about dd7, one probably shouldn't forget about expression pedal.

Other search terms related to dd7 and their ratings are:
★★★★★ expression pedal
★★★★ tap tempo
You have in mind a companion for dd7 and it is not yet here? Propose!



Google Trends

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dd7
dd3
dd5