If you want a fast and easy way to fix underexposed or overexposed photos, Remini is well worth a look. The AI-powered tool can dramatically improve imagery by improving face quality, color, noise reduction and blur and focus. It's available as a simple API and can upscale photos without losing quality, so it's good for social media, heritage preservation and printing services.
Another good choice is PhotoKit, an AI-powered online photo editor that's got a lot of editing tools besides exposure repair. It handles lots of file formats, works on lots of devices and doesn't store your photos on its servers, so it's got a good privacy record. It's available in free and VIP subscription versions, so it's good for casual users and pros.
If you want some quick fixes for lighting, color and tone, Pixble is a good option. It automates common photo fixes and offers a few pricing tiers. Pixble can be used in third-party apps through its API and supports a lot of image formats, so it can be a good option for marketing, e-commerce and creative pros.