Below are some third party apps to enhance Iphone Camera Long Exposure shots:-

1. VSCO Cam:- You can personalize the shutter speed and adjust the presets to achieve the best shot on this app.

2. NightCap Camera:- This app is a paradise for low-light photography; it excels in night photography, capturing moving cars, low-light trails, sunsets, and more.

3. Camera+:- The best feature of this app is shutter speed control; it goes from ¼ seconds up to 15 seconds.