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It is worth noting that Fe3+ is paramagnetic in nature. Thus, in most of the cases, Fe3+ behave as fluorescent quencher which makes it difficult to develop a fluorescent ‘turn-on’ chemosensor. Therefore, it is still a big challenge to devise and synthesise a simple chemosensor that could selectively detect Fe3+ via fluorescent ‘turn-on’ response. In this paper, A simple fluorescence chemosensor T based on N,N-(3,3-dimethyl biphenyl)-bis(2-methoxyphenol) has been synthesised. T could selectively detect Fe3+ via fluorescent ‘turn-on’ response. Meanwhile, the fluorescent spectrum limit of T towards Fe3+ was 0.178 nM, the detection limit was much lowest than previously reported fluorescent chemosensor and has reached to ultrasensitive level. In addition, T could also alternately detect CN−. Intriguingly, IMPLICATION logic gate was successfully constructed. Finally, the test papers and films based on T were prepared, which could be used as a fluorescent display material for the detection of Fe3+ and CN−. In this article, a simple chemosensor (T) for ultrasensitive fluorescent ‘turn-on’ detection of Fe3+ and alternant detection of CN− has been designed and synthesised. The fluorescent spectrum detection limit of T towards Fe3+ was 0.178 nM, the detection limit was much lowest than previously reported fluorescent chemosensor and has reached to ultrasensitive level. Based on the alternant detection property of T for Fe3+ and CN−, the fluorescent ‘ON-OFF-ON’ responding circle, IMPLICATION logic gate and test kits were constructed and prepared successfully, showing potential for practical applications in the detection of metal ions, toxic ions as well as smart material aspects.