Kairos
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Kairos makes client time tracking and month-end invoicing part of one simple Telegram workflow. Log work from a daily reminder or in a compact message, then review hours by customer and month. Google Sheets can serve as the source of truth, keeping existing customer spreadsheets up to date without a separate database.
When it’s time to bill, Kairos generates customer-ready invoice PDFs with details configured for each customer. It can be adapted to different countries’ invoicing requirements through custom API integrations, including Argentina’s ARCA for authorized Factura C invoices. You can also edit or remove entries and optionally send invoices by email.