Comparison

Tilted Prism vs PatchPal

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

Head to head
About

Tilted Prism

Features
Read full description

This app simplifies the calculations and prescription for tilted prisms, resulting from the combination of a horizontal + vertical prism. This app facilitates the prescription od tilted prisms in cases of diplopia due to combined horizontal and vertical deviations. Starting with the patient's deviation measurements, the app calculates the resulting power of the combined prism, the resulting angle of the prism, and allows splitting of the resulting prism for both eyes, or the option to place it for a single eye (such as is used for Fresnel prisms).

About

PatchPal

This app helps parents track and make eye patching for children with lazy eye more engaging. It features a timer, mini-games, rewards, and progress tracking to motivate kids. Data can be synced and exported for doctor visits.

Highlights
  • Eye patching timer with progress tracking
  • Engaging mini-games for kids
  • Achievement system and rewards
  • Detailed progress charts and statistics
  • Cloud sync across devices
  • Reminder notifications
  • Data export to CSV
Features
Read full description

PatchPal helps families track eye patching time for children with amblyopia (lazy eye). Make patching fun and engaging! KEY FEATURES: • Simple timer with colorful progress tracking • Fun mini-games to keep kids engaged during patching • Achievement system and rewards to motivate children • Detailed progress charts and statistics • Cloud sync across all your devices • Reminder notifications to never miss a session • Export data as CSV for doctor visits • Beautiful, kid-friendly design Perfect for parents managing their child's eye patching treatment. All features are completely free to use, with optional support options available. SUBSCRIPTION INFORMATION: PatchPal offers optional auto-renewable subscriptions to support ongoing development. Subscriptions are managed through your Apple ID settings and can be canceled at any time. IMPORTANT MEDICAL DISCLAIMER: This app is for informational and tracking purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or qualified health provider with any questions regarding a medical condition. Do not use this app to diagnose or treat medical conditions. Privacy Policy: https://sushantwason.github.io/patchpal-legal/privacy_policy.html Terms of Use (EULA): https://sushantwason.github.io/patchpal-legal/terms_of_service.html Download PatchPal today and make patching time easier and more fun!

Screenshots

Tilted Prism2 screens
PatchPal4 screens

Verdict

The call

The clearest difference is price: PatchPal at Free against Tilted Prism's $14.99. PatchPal also leads on update cadence (every 3 days vs fortnightly). Tilted Prism's advantage is iOS requirement (12.0 vs 15.0). On ads, in-app purchases 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

PatchPal is free to download; Tilted Prism costs $14.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Tilted Prism ships an update fortnightly, PatchPal every 3 days. The most recent releases landed on September 17, 2026 and July 30, 2026 respectively.

Scorecard3 real differences · 7 level
Tilted Prism versus PatchPal: the parameters behind the verdict, then further details
ParameterTilted PrismPatchPal
Price$14.99Free — better
Rating—5.0 (4 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—4 — better
Update frequencyFortnightlyEvery 3 days — better
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size46 MB5 MB
Age rating12+17+
DeveloperHugo BrancoSUSHANT WASON

In-app purchases

None

Tilted Prism

No in-app purchases

None

PatchPal

No in-app purchases

Questions

Is Tilted Prism free?
Tilted Prism costs $14.99, with no in-app purchases.
Is PatchPal free?
PatchPal is free to download, with no in-app purchases.
Do Tilted Prism or PatchPal have ads?
Neither Tilted Prism nor PatchPal shows ads.
Which is updated more often, Tilted Prism or PatchPal?
Tilted Prism ships an update fortnightly, and PatchPal every 3 days. Most recently, Tilted Prism was updated on September 17, 2026 and PatchPal on July 30, 2026.

Other comparisons