App for practising spelling for Y5/6

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Hi,
Can anyone recommend an effective spelling app for my youngster. A good reader, but average speller and would like her to become more accurate with her spellings, especially of difficult words.
Thanks for your help.

We used squeebles app my dd got on really well with it. You type the word and record you staying it too, we then used the length of time the word was displayed to help her learn them.