Design QA
Review exported screens before handoff and locate weak text contrast without inspecting every layer.
v1.0 · macOS 14+ · On-device
Image contrast, reviewed in context.
Find text in screenshots, estimate its rendered contrast, and move from a flagged result to the exact image region.
Available now · Free download
On-device
Images are analyzed on your Mac
WCAG + APCA
Choose either view or see both
Bidirectional
Results and regions stay linked
Unlimited Pro batch
No batch queue limit
Rendered-screen review
Check what users actually see.
ContrastRadar complements source-code accessibility tools when the only reliable artifact is a screenshot or exported design.
Product audits
Check a set of real application states, including content that differs from the design file.
Evidence for fixes
Give designers and engineers the exact region, estimate, and confidence needed for a focused follow-up.
A focused review flow
From screenshot to evidence.
ContrastRadar keeps recognition, contrast estimates, location, and confidence in one native Mac workspace.
Add the real screen
Drop in PNG, JPEG, or HEIC screenshots and design exports.
Run local analysis
Apple Vision locates text while ContrastRadar estimates foreground, background, and contrast.
Locate and verify
Filter the results, jump to the exact region, and review the confidence before deciding.
Location, not just a ratio
See the result where it appears.
A contrast value is easier to trust when the corresponding text and sampled region stay visible. Select either side and ContrastRadar keeps the other in view.
Two-way navigation
Select a result to locate its rectangle, or select a region to return to the result.
Worst-case estimate
Review the lowest estimated contrast found across the text region.
Confidence shown
Prioritize high-confidence failures without hiding cases that need judgment.
Two views, clearly separated
WCAG for established checks. APCA for perceptual guidance.
Display WCAG only, APCA only, or both. ContrastRadar explains thresholds, polarity, confidence, and the limits of image-based analysis directly in the app.
WCAG 2.2
AA thresholds for normal and large text, using the established contrast-ratio method.
APCA
Lc values with polarity-aware perceptual guidance and risk context.
Transparent limits
A screenshot cannot reveal original font metrics, CSS, or semantic context. Final review remains yours.
Built for rendered interfaces
The details needed for a useful review.
Text recognition
Apple Vision OCR with automatic language detection
Rendered colors
Foreground and nearby background sampling
Result filters
Passing, failing, all, and high-confidence issues
Large images
Proportional downsampling above a 4096-pixel edge
Batch workflow
Unlimited Pro queue with cancellation and isolated failures
Reports
PDF and CSV export for completed checks
Free and Pro
Check one screen or review a complete set.
Pro is a one-time in-app purchase. The final price is shown by your local App Store.
Free
Single-image review
- Unlimited checks
- WCAG 2.2 and APCA
- Location, filters, and confidence
Pro
Batch and reports
- Unlimited batch queue
- Sequential local analysis
- PDF and CSV export
Private by architecture
Your screenshots stay on your Mac.
No uploads, account, advertising, analytics, or tracking. Only an optional Pro purchase is processed by Apple through StoreKit.
Read the privacy policy →Questions
Before the first review.
Does ContrastRadar upload images?+
No. OCR, color sampling, and contrast calculations run locally on your Mac.
Is every result a definitive accessibility verdict?+
No. Image analysis cannot see original font metrics, CSS, or semantic context. ContrastRadar shows estimates and confidence for your final review.
Why show WCAG and APCA together?+
WCAG 2.2 provides established ratio-based thresholds. APCA adds polarity-aware perceptual guidance. You can display either standard or both.
What does Pro unlock?+
A one-time Pro purchase adds an unlimited batch queue plus PDF and CSV report export.
Find the text. Review the evidence.
Download it free from the Mac App Store. Use single-image checks without limits, then unlock batch analysis and report export with one Pro purchase.