Impossible Project film was the main third-party source for Polaroid integral film, while Fujifilm made peel-apart film rather than a direct equivalent.

Compared with original Polaroid stock, Impossible Project film was described as more experimental and not fully matching the classic Polaroid look or consistency. A key difference is that it is much more sensitive to temperature and to light during development, so handling after exposure matters more than with older Polaroid film.

That said, users also report it can be very fun to shoot and is capable of producing very nice images when used properly. So the tradeoff is less predictability and less “true original Polaroid” character, but still a distinctive and enjoyable instant-film experience.

In short: expect quirks, especially during development, and don’t expect an exact replacement for vintage Polaroid stock—but it can still be rewarding.