Many messaging apps show when a message has been read, but they lack a graceful way to remind someone to respond without sending another message. This can create unnecessary message clutter and social awkwardness, especially for time-sensitive communications where people need gentle follow-ups.

A Subtle Nudge System

One approach could be to integrate a notification feature that lets users prompt attention to specific messages without additional texting. This might work by:

• Long-pressing a sent message to access a "nudge" option
• Sending a discreet notification to the recipient that highlights the original message
• Using visual indicators that don't create new message bubbles

The recipient would see which message needs attention amid their conversations. Different nudge types could range from casual reminders to urgent follow-ups, with controls to limit overuse.

Building on Existing Patterns

This concept would adapt elements from other platforms while fitting WhatsApp's design:

• It could use the same interaction as message reactions (long-press menu)
• The notification system might work like message alerts without creating new chats
• Visual cues could complement the existing read receipt indicators

Unlike Facebook's old poke feature that sent standalone messages, this would work contextually within conversations. It would be more lightweight than Slack reminders, and more personal than Telegram's group message highlighting.

Implementation Considerations

A simple version could start with basic functionality:

1. Adding the option to the message menu
2. Designing subtle notification indicators
3. Implementing frequency limits to prevent misuse

Later enhancements might include custom nudge styles or analytics on response rates. The system could adapt to different communication preferences through settings similar to WhatsApp's existing privacy controls.