---
title: "Nuclear Mode vs. a Nuclear Lock focus session: what's the difference?"
description: "Nuclear Lock ends when a session timer does, for today's deadline. Nuclear Mode runs to a calendar date, for quitting a habit."
url: "https://www.welock.in/faq/nuclear-mode/nuclear-mode-vs-nuclear-lock"
locale: "en"
---

# Nuclear Mode vs. a Nuclear Lock focus session: what's the difference?

Same spirit, different clock. A Nuclear Lock focus session cannot be stopped until its timer ends, good for a hard deadline today. Nuclear Mode locks a whole category until a date you choose, built for quitting over days, weeks or longer. Both survive restarts and uninstalls, and neither has an override.

## Specifics

- Nuclear Lock: hours. Scoped to one session, ends when the timer does.
- Nuclear Mode: days to months. Scoped to a category, ends on a calendar date.
- Use the Lock for deadlines and the Mode for habits.

## Related questions

- [What is Nuclear Mode?](https://www.welock.in/faq/nuclear-mode/what-is-nuclear-mode)
- [Is it really permanent, genuinely no way to turn it off early?](https://www.welock.in/faq/nuclear-mode/is-it-really-permanent)
- [Do you track or log the websites I visit?](https://www.welock.in/faq/privacy/do-you-track-my-browsing)
- [What does "on-device filtering" mean for me?](https://www.welock.in/faq/privacy/on-device-filtering)
- [A site or app isn't being blocked. What do I do?](https://www.welock.in/faq/troubleshooting/site-not-being-blocked)

Part of [Nuclear Mode](https://www.welock.in/faq/nuclear-mode).

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