InjectGPT

by help@dealdepot.io · Tools

Manifest V3 Free

View in Chrome Web Store Data as of 16 Oct 2026

Inject your custom system and developer prompt. Also lets you change the model and hardcode it!

Users

674

−1 in 30 days

Rating

3.4 / 5

unchanged in 30 days

Ratings

0 in 30 days

Store rank

#38K

#32K among extensions

Version

2.0.4

updated 10 Mar 2026

Users

monthly, 8 months

Latest, 16 Oct 2026: 674 usersMove the mouse over the chart for any month

Ratings count

monthly, 8 months

Latest, 16 Oct 2026: 5 ratingsMove the mouse over the chart for any month

The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.

About InjectGPT

This extension lets you override the System prompt of OpenAI's model ChatGPT. You can change the system prompt, developer prompt and model as you like. This also works with no account. You can set your system prompt and it will always remember it, also with completely new chats. It intercepts on the network level and injects the system prompt automatically.