How Cleana's AI Selects the Best Photo from Similar Pictures
You take ten photos of the same moment and end up with nine near-identical shots you will never look at again. The problem is figuring out which one to keep. Doing this manually for thousands of similar photos takes hours. Cleana's AI does it in seconds — and it gets it right nearly every time.
The problem with similar photos
Modern iPhones make it effortless to take many shots at once. Burst mode fires off 10 photos per second. Live Photos capture motion. Portrait mode requires multiple takes to get the lighting just right. The result is a photo library full of clusters of nearly identical shots where only one or two are worth keeping.
Most people ignore this problem because manually comparing similar shots is tedious. So the extras sit in your library, wasting gigabytes of storage for years.
What Cleana's AI actually analyzes
When Cleana scans a group of similar photos, its AI evaluates each image across five quality dimensions:
1. Sharpness and blur detection
The AI measures how sharp the subject is at a pixel level. Motion blur, camera shake, and out-of-focus subjects all reduce a photo's sharpness score. A photo where the subject is crisply in focus scores higher than one that is even slightly blurry — even if the blur is hard to notice at a glance.
2. Exposure and brightness
A well-exposed photo has balanced highlights and shadows. Cleana's AI flags overexposed shots (washed-out whites) and underexposed shots (murky shadows) in favor of photos with proper tonal balance. This is especially important for indoor shots where lighting conditions vary shot to shot.
3. Noise level
In low-light conditions, iPhone cameras introduce digital noise — a grainy texture that degrades image quality. The AI measures the noise level of each photo and prefers cleaner shots. This matters most for nighttime or indoor photos taken without flash.
4. Face quality
For photos containing people, Cleana checks whether faces are sharp, well-lit, and with eyes open. A group photo where everyone looks good scores higher than one where someone blinked or turned away. The AI detects faces and evaluates them specifically, not just the overall image sharpness.
5. Composition
The AI also evaluates basic compositional quality: whether the main subject is centered or well-framed, and whether the edges of the frame are clean. A photo where the subject is cut off or tilted scores lower than one that is properly composed.
How the scoring works
Each photo in a similar group receives a combined score based on all five dimensions. The highest-scoring photo is marked as the recommended keep — shown with a checkmark in the Cleana interface. The others are flagged for deletion with an X.
The weighting between dimensions adapts to the content of the photo. For a portrait, face quality carries more weight. For a landscape, sharpness and exposure dominate. The AI adjusts automatically based on what is actually in the image.
How accurate is it?
Cleana's AI is trained to match human judgment — specifically, the photo that most people would choose to keep when comparing a set of similar shots. In testing, the AI recommendation matches what users would have picked manually in the vast majority of cases.
Where the AI is most accurate:
- Burst photos of the same subject in the same location
- Group photos where someone blinked in some shots
- Low-light photos with varying noise levels
- Portrait shots with varying focus quality
Where to apply your own judgment:
- Photos where artistic intent matters (one is technically worse but you prefer it)
- Shots from different angles where personal preference decides
- Photos where expression matters more than sharpness
You always have the final say
Cleana never deletes anything without your confirmation. The AI recommendation is exactly that — a recommendation. You can review each group, tap any photo to see it full screen, and override the suggestion if you prefer a different shot.
If you disagree with the AI's pick, you can select any photo in the group as the keeper and mark the others for deletion. The AI learns nothing from your overrides — your photos stay entirely private and on-device.
Can you restore a photo if you change your mind?
Yes. Photos deleted through Cleana go to the Recently Deleted album in the iPhone Photos app. They stay there for 30 days before being permanently removed. During that window, you can open Photos, go to Albums, find Recently Deleted, and restore any photo with one tap.
How to get started
- Download Cleana from the App Store
- Open the app and grant photo library access
- Tap Scan and wait for the analysis to complete
- Open the Similar Photos section
- Review each group — the AI's recommended keeper is already highlighted
- Swipe to confirm deletions or tap to review individual photos
Most users with a few thousand photos complete the entire review in under ten minutes. The result: a leaner photo library where every shot you kept is genuinely worth keeping.
Try Cleana for free and let the AI handle the comparison work for you.