Sidenote, the journal that lives in your text thread

Field notes

Sidenote uses a phone number as both the account identity and the journal destination. The public walkthrough shows a sequence of saved messages, one midday question, a text-based dry-cleaning task, and a 10 p.m. entry assembled from the day’s material. It supports iMessage or SMS and accepts text, photos, and 14-second voice notes. The page says users can pause prompts and cancel by text; the displayed price is $10 per month with a 14-day refund.