You can continue to use remarkscopilot.string.sg - do note that this is independently maintained as a citizen-led initiative. The underlying tech, infra is still the same. The only difference is that the domain is no longer beta.gov.sg

If you need support for remarkscopilot, there is a dedicated channel after join.string.sg

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You can also consider using smartcompose.gov.sg (previously appraiser.gov.sg)