How do I add a watermark to a photo? ▶
What is a Device Template? ▶
A Device Template saves your camera's brand, model, lens, and default shooting parameters. When you import a photo that's missing EXIF data (e.g., from a film scan or older camera), Mimas can auto-fill those details from your template.
Free Up to 2 templates.
Pro
Unlimited templates.
Where are my exported photos saved? ▶
All watermarked photos are saved to a dedicated "Mimas" album in your iOS Photos library. Mimas never modifies or deletes your originals — it always creates a new copy.
The in-app Library tab also keeps a record of your exports for easy re-editing or sharing.
What's included in Mimas Pro? ▶
- Batch Export — process up to 50 photos at once with shared settings
- Unlimited Device Templates — no limit on saved camera presets
- EXIF Write-back — embed your edited metadata into a new copy of the original photo
How does the 7-day trial work? ▶
From the first time you open Mimas, you have 7 days of full Pro access — no Apple ID required, no credit card, no commitment. After 7 days, Pro features require a one-time purchase of $2.99.
The trial countdown is shown in the Process tab and in About → Subscription.
How do I restore my purchase on a new device? ▶
Can I use Mimas Pro on iPad and iPhone? ▶
Yes. Mimas Pro is shared across all devices signed in with the same Apple ID via Apple's Family Sharing and non-consumable purchase system. Buy once, use on all your devices.
Mimas can't read EXIF from my photo ▶
Some photos don't contain EXIF data — this is common with:
- Screenshots
- Photos shared via messaging apps (which strip metadata)
- Scanned film photos from a flatbed scanner
- Photos from certain social media platforms
In this case, Mimas will show ⚠️ on fields it couldn't read. You can fill in the data manually, or apply a Device Template to pre-fill all fields at once.
Export says "Failed" — how do I fix it? ▶
This is usually a Photos library permission issue. To fix:
EXIF write-back isn't working ▶
EXIF write-back requires Full Access to your Photos library (not Limited Access). It also requires Mimas Pro (or an active trial).
The write-back creates a new copy of your photo with the EXIF data embedded in the file — it does not modify the original. After write-back, Mimas will ask if you want to delete the original.
Note: EXIF write-back is only available for photos selected via the single-photo picker (not batch mode), as it requires a direct reference to the original Photos library asset.
Will Mimas work without an internet connection? ▶
Yes, fully. Mimas processes everything on-device and works completely offline. The only time internet is used is during in-app purchase verification, which is handled by Apple.
How do I contact support? ▶
Email us at hello@mimas.app. Please include:
- Your iOS version and device model
- Mimas version (found in About)
- A description of what happened
We typically reply within 24 hours on weekdays.