OTPfill

Product Introduction

1. Definition: OTPfill is a native macOS menu bar application designed for one-click autofill of One-Time Passwords (OTPs) and verification codes directly from a user's email inbox. It operates as a system-level productivity and security utility.
2. Core Value Proposition: OTPfill exists to eliminate the disruptive, multi-step workflow of manually switching to an email client, locating a verification code, memorizing it, and typing it into a web form. Its core value is delivering seamless OTP autofill and instant email verification code filling to streamline logins and enhance user experience on Mac.

Main Features

1. Menu Bar Integration & Context-Aware Detection: OTPfill runs discreetly in the macOS menu bar. It uses Accessibility APIs to monitor system focus. When the user clicks into a text field commonly used for verification codes, the app automatically triggers an inbox scan. This context-aware code detection ensures it only activates when needed.
2. Multi-Provider Inbox Scanning & Secure Parsing: The app connects to major email services (Gmail, Outlook, iCloud, Yahoo, Fastmail, and any IMAP account) via secure OAuth (for supported providers) or encrypted IMAP credentials. Upon field focus, it scans only the last three minutes of mail in connected inboxes. Message text is processed in memory on the developer's server to extract the code; emails are not stored or logged, ensuring privacy-focused OTP handling.
3. Universal Fill Action & Browser/App Compatibility: When a code is detected, a "Fill" button appears directly under the focused code field. Users can click it or use the customizable keyboard shortcut (default: ⌘⇧O). It works universally across Safari, Chrome, Arc, Brave, Edge, other Chromium-based browsers, and within native Mac desktop applications, providing cross-app OTP autofill.

Problems Solved

1. Pain Point: The friction and security risk of manual OTP entry, which involves context-switching, app tab hunting, and potential typos that delay secure access to accounts.
2. Target Audience: The primary user personas are security-conscious professionals, developers, power users, and any Mac user who frequently encounters two-factor authentication (2FA) or email verification during their daily workflow across numerous web services and apps.
3. Use Cases: Essential scenarios include: logging into banking apps, SaaS platforms like Linear or Slack, e-commerce checkouts, and any service that uses email-based two-factor authentication. It is particularly valuable for users managing multiple accounts or who receive a high volume of verification emails.

Unique Advantages

1. Differentiation: Unlike built-in browser autofill (which often doesn't work with OTPs) or manual methods, OTPfill provides a system-wide, email-native solution. It differs from authenticator apps (which are for TOTP codes) by specifically solving the problem of codes sent via email, a common gap in the 2FA ecosystem.
2. Key Innovation: Its proactive, in-situ UI is the key innovation. Instead of requiring the user to fetch the code, OTPfill pushes the code to the exact point of need—under the form field—within seconds of the email arriving. Combined with its strict time-limited (3-minute) and focus-triggered scanning, it offers a powerful yet privacy-respecting automation.

Frequently Asked Questions (FAQ)

1. Is OTPfill secure? Does it read all my emails? OTPfill is designed with a privacy-first architecture. It only scans your inbox when a code field is focused and only looks at emails from the last three minutes. Emails are processed ephemerally in server memory to extract the code; they are not stored, logged, or retained. For Gmail/Outlook, it uses secure OAuth.
2. Does OTPfill work with SMS texts or authenticator apps like Google Authenticator? No. OTPfill is specifically engineered for autofilling verification codes from email. It does not read SMS/iMessage or generate Time-based One-Time Passwords (TOTP) like Authy or Google Authenticator. It solves the distinct problem of email-delivered codes.
3. What is the pricing model? Is it a subscription? OTPfill uses a one-time purchase license of $29, which includes the app for all your Macs and future updates, with support for two email inboxes. An optional $5/month "Unlimited Inboxes" add-on is available for users needing more than two connected accounts, which can be canceled anytime while retaining the core app.
4. Why does OTPfill require Accessibility permission on Mac? The Accessibility API permission is required for the app to detect when your cursor focuses on a verification code input field across different browsers and applications. This system-level access is essential for its core function of context-aware code detection and fill-button placement.
5. Can I try OTPfill before purchasing the license? Yes, OTPfill offers a full-featured trial upon download. The trial allows you to connect inboxes and test the autofill functionality to evaluate its performance and compatibility with your workflow before committing to the one-time purchase.