Comparison

RainMark vs gaku

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

RainMark

Enhance your photos with professional watermark borders that automatically display shooting parameters. Choose from a variety of design templates and customize your signature and layout for a unique look. Export your creations in original quality with fast batch processing.

Highlights
  • Smart EXIF parameter reading
  • Professional design templates
  • Deep watermark customization
  • Signature support (text/image)
  • Ultra-fast batch processing
  • Original quality export
  • Real-time preview
Features
Read full description

RainMark - Make Every Photo a Masterpiece A professional watermark border tool designed for photographers and enthusiasts. Automatically read and display detailed shooting parameters (EXIF), and choose from a massive library of professional templates to make your work stand out on social media. Key Features Smart EXIF Parameter Reading Automatically identify and display photo shooting information, including: Core Parameters: Aperture (F), Shutter Speed, ISO, Focal Length (including 35mm equivalent) Device Info: Camera Model, Lens Model, Shooting Time Location: GPS Coordinates Supports RAW format import (CR2, NEF, ARW, DNG, etc.) to restore the most authentic shooting data. Professional Design Templates Selected templates in various styles to instantly elevate your photos: Classic Series: Restore the classic texture of film and photo paper Simple Series: The art of white space, highlighting the subject Transparent Series: Floating parameters, full of modern sense Creative Series: Unique layout to show personality Deep Customization Create your exclusive watermark, refuse to be the same: Signature: Support text signature (custom font, weight, color) and image signature Visual Tweaks: Precisely control image corner radius, shadow strength, shadow color Layout: Adjust margins and spacing as you like Color Management: Built-in "Dopamine" color schemes, supporting auto-inversion and custom color picking Flagship Export Experience Ultra-fast Batch Processing: Newly optimized export engine with lower memory usage and rocket-like speed Original Quality Output: Support JPG/PNG formats, optional original quality to ensure lossless image quality Real-time Preview: Support grid/list dual view preview, what you see is what you get Smooth Interactive Experience Perfectly adapted to dark mode, comfortable for night editing Haptic feedback design, every operation is precise and pleasing Simple and intuitive interface, beginners can become professional photographers in seconds Whether it's mobile photography recording daily life or professional creation pursuing ultimate image quality, RainMark adds the finishing touch to your work. Download now and start your professional photography showcase journey!

About

gaku

Features
Read full description

Frame your photos. Like art. gaku frames your photos with clean margins and shooting info (Exif). Full quality, no ads. ◆ Framing - Layouts: BAR / FRAME / POLAROID / FILM / CLEAN - Show camera info in the margin, or stamp it directly on the photo - Toggle camera model, focal length, aperture, shutter, ISO, and date with one tap - Adjust margin size, ratio (1:1 / 4:5 / 4:3 / 3:2 / 9:16), and colors - Two keyline borders: around the photo and along the outer edge - Text size, bold, and text color ◆ Quality & metadata - Exports at full resolution, no quality loss - Original Exif is preserved in exported JPEGs - GPS is removed from exports by default — share safely ◆ Videos too - Apply the same frames to videos and export (Premium) ◆ Shot-location map - The places you frame are recorded on your own minimal white map (viewing requires Premium) - Map data never leaves your device ◆ Premium No watermark / video export / shot-location map / custom text / credit signature / all layouts / presets / batch processing / color extraction Monthly and yearly plans (both with a 7-day free trial), or a one-time lifetime purchase. ◆ About gaku - No ads - All processing happens on your device — nothing is uploaded - No account required Terms of Use: https://gaku.mamonis.studio/terms_of_use.html Privacy Policy: https://gaku.mamonis.studio/privacy_policy.html

Screenshots

RainMark4 screens
gaku3 screens

Verdict

The call

The clearest difference is in-app purchases: RainMark at none against gaku's 3. RainMark also leads on iOS requirement (12 vs 15.0). On price, update cadence, ads and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. gaku sells 3 in-app purchases, starting at $1.99 per month. RainMark asks for nothing beyond the download.

UpkeepUpdate frequency

RainMark ships an update every 10 days, gaku every 3 weeks. The most recent releases landed on October 24, 2026 and October 29, 2026 respectively.

Scorecard2 real differences · 8 level
RainMark versus gaku: the parameters behind the verdict, then further details
ParameterRainMarkgaku
PriceFreeFree
Rating4.8 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 10 days — betterEvery 3 weeks
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPad, iPod, Mac — betteriPhone, iPad, iPod
Requires iOS12 — better15.0
Further details — not scored
Size69 MB21 MB
Age rating4+4+
Developer峻宏 刘MAMORU TAKANAMI

In-app purchases

None

RainMark

No in-app purchases

3 purchases

gaku

Subscriptions2
  • gaku Premium Monthly$1.991 Month
  • gaku Premium Yearly$14.991 Year
One-time1
  • gaku Premium Lifetime$29.99

Questions

Is RainMark free?
RainMark is free to download, with no in-app purchases.
Is gaku free?
gaku is free to download, with in-app purchases available.
Do RainMark or gaku have ads?
Neither RainMark nor gaku shows ads.
Which is updated more often, RainMark or gaku?
RainMark ships an update every 10 days, and gaku every 3 weeks. Most recently, RainMark was updated on October 24, 2026 and gaku on October 29, 2026.

Other comparisons