As in previous editions, the results of each show were decided by an in-studio jury of two permanent members and revolving guest judges.

Eva Norton and Orla McDermott both advanced to the final duel stage and performed their covers a second time.

[7] The second heat of Junior Eurovision Éire was broadcast on 19 September 2021, with Brian Kennedy as the guest judge.

Cora Harkin and Sienna Hopkins both advanced to the final duel stage and performed their covers a second time.

Sadbh Breathnach and Alison McGrath both advanced to the final duel stage and performed their covers a second time.

[11] The fourth and final heat of Junior Eurovision Éire was broadcast on 3 October 2021, with Mickey Joe Harte as the guest judge.

Maiú Levi Lawlor and Ruby Maher both advanced to the final duel stage and performed their covers a second time.

[13] The semi final of Junior Eurovision Éire was broadcast on 10 October 2021, with Lesley Roy as the guest judge.

Maiú Levi Lawlor and Julie Cole were both chosen to go through to the final duel stage and performed their covers a second time.

It was written by Niall Mooney, Lauren White Murphy, Brendan McCarthy, LA Halvery, Junior Eurovision 2019 entrant Anna Kearney (who also provides backing vocals), Anna Banks and Cyprian Cassar, who wrote entries for Malta in 2018, 2020, 2021, and for Ireland in 2019.