Invertornot.com – API to enhance your images in dark-mode
Hi HN, I built (https://invertornot.com) it's an API that can predict whether an image will look good/bad while inverted. This is particularly useful for images in dark-mode as you can now safely invert them. The conservative solution to adapt images for dark-mode consist in dimming the image, however there is a lot of images that can be inverted (graph for example). Using deep learning we can avoid heuristics and obtain a much more reliable solution. The API uses an EfficientNet pre-trained model fine-tuned on a custom dataset (1.1k samples). EfficientNet was chosen as it was…
Invertornot.com – API to enhance your images in dark-mode launched on March 25, 2024 with 175 votes, #288 of 4,270 launches that month and more than 95% of that year's launches. The site was still online in September 2026, 2 years on.
In plain words
Invertornot.com is an API that uses deep learning to predict whether images will look good when inverted, enabling safe image inversion for dark-mode interfaces. Rather than simply dimming images, the tool determines which ones—such as graphs and charts—can be inverted while maintaining readability. It employs an EfficientNet model fine-tuned on a custom dataset, resulting in a compact 16MB model suitable for self-hosted deployment. The service is designed for developers building dark-mode applications who need reliable image adaptation.
written from the facts on this page · September 2026
From the sources
InvertOrNot.com is a website for classifying images by how to display in web dark-mode
Make your app's dark-mode smarter with InvertOrNot. Our API predicts if an image should be inverted for optimal dark-mode rendering. This API is free, and is open source (both the code and the weights of the model are available ). Upload an image (JPG, PNG, WebP, SVG, or PDF) to see what transformation InvertOrNot would apply to it. Despite dark-mode's popularity, images often aren't automatically adapted to fit it. The conservative approach is to reduce the brightness of the image, which can degrade it significantly. Inverting the image can be a better solution, but it can't be applied to all images (see the poor Queen Victoria). Using our API you can make your website more pleasant to use…from invertornot.com
In the maker’s words, at launch
Hi HN, I built (https://invertornot.com) it's an API that can predict whether an image will look good/bad while inverted. This is particularly useful for images in dark-mode as you can now safely invert them. The conservative solution to adapt images for dark-mode consist in dimming the image, however…
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