Comparison

CTC vs Peter the Protocol Reader

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

Head to head
About

CTC

This medical reference app provides quick access to standardized adverse event criteria and grading scales for oncology research. It allows for efficient logging, tracking, and reporting of patient events, including performance scores and custom entries. Data is kept strictly on-device for privacy and compliance.

Highlights
  • CTCAE v4 and v5 reference
  • Performance score integration (Karnofsky, ECOG, Lansky)
  • Advanced adverse event logger
  • Custom event creation
  • CSV data import/export
  • On-device data storage
Read full description

CTC-AE is a reference and educational tool for clinical researchers, oncologists, and healthcare professionals working with adverse event terminology and oncology performance status scales. The app provides fast, offline access to publicly available standards: • NCI Common Terminology Criteria for Adverse Events (CTC-AE v4.03 and v5.0) • ECOG Performance Status • Karnofsky Performance Status • Lansky Performance Status (pediatric) You can also keep personal reference notes about trials and patients, stored privately in your own iCloud account and synced across your Apple devices. Export your data as CSV at any time. KEY FEATURES • Complete CTC-AE v4.03 and v5.0 terminology with grades and definitions • Color-coded severity grades for quick visual reference • Multi-column layout optimized for iPad • Performance status scales (ECOG, Karnofsky, Lansky) • Personal trial and patient reference notes, stored privately in your own iCloud account and synced across iPhone, iPad, and Mac • CSV export • Optional Face ID / Touch ID protection • Optional name scrambling for on-screen privacy PRIVACY Your reference notes live in your private iCloud container. Arpacore B.V. has no access to this data, and no information is shared with any third party. INTENDED USE CTC-AE is intended for educational and reference purposes only. It is not a medical device. It is not intended to diagnose, prevent, monitor, predict, prognose, or treat any disease, injury, or disability, and does not provide medical advice. All clinical decisions remain the sole responsibility of qualified healthcare professionals. The CTC-AE terminology is published by the U.S. National Cancer Institute and is reproduced here for reference. This app is not affiliated with, endorsed by, or sponsored by the NCI or NIH. CTC-AE is also available natively on Mac, with full sync between your devices.

About

Peter the Protocol Reader

This AI assistant streamlines clinical research by quickly converting protocols into actionable insights. It's designed to enhance the quality and efficiency of research delivery for clinical sites.

Highlights
  • Protocol to practical insights
  • AI-powered assistance
  • High-quality research delivery
  • Secure and trusted
  • Confidence in research
Features
Read full description

Peter is the AI-assistant purpose-built for clinical research. Secure and trusted by study sponsors, Peter is designed to help you deliver high-quality research with confidence. Go from protocol to practical in seconds.

Screenshots

CTC4 screens
Peter the Protocol Reader4 screens

Verdict

The call

The clearest difference is price: Peter the Protocol Reader at Free against CTC's $3.99. Peter the Protocol Reader also leads on in-app purchases (none vs 1) and update cadence (every 3 weeks vs every 2 months). On ads, device support and iOS requirement 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

Peter the Protocol Reader is free to download; CTC costs $3.99 up front. CTC sells 1 one-off in-app purchase. Peter the Protocol Reader asks for nothing beyond the download.

UpkeepUpdate frequency

CTC ships an update every 2 months, Peter the Protocol Reader every 3 weeks. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.

Scorecard4 real differences · 6 level
CTC versus Peter the Protocol Reader: the parameters behind the verdict, then further details
ParameterCTCPeter the Protocol Reader
Price$3.99Free — better
Rating—5.0 (3 ratings) — better
Positive reviews55.6% of reviews—
Number of ratings—3 — better
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPad, Mac — betteriPhone, iPad
Requires iOS17.616.0 — better
Further details — not scored
Size2 MB108 MB
Age rating17+17+
DeveloperArpacore B.V.Care Access

Customer experience

CTC

Written reviews9 reviews
Positive55.6%
Neutral33.3%
Negative11.1%

Peter the Protocol Reader

All ratings3 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

1 purchases

CTC

One-time1
  • Adverse Event Logger$3.99
None

Peter the Protocol Reader

No in-app purchases

Questions

Is CTC free?
CTC costs $3.99, and also offers in-app purchases.
Is Peter the Protocol Reader free?
Peter the Protocol Reader is free to download, with no in-app purchases.
Do CTC or Peter the Protocol Reader have ads?
Neither CTC nor Peter the Protocol Reader shows ads.
Which is updated more often, CTC or Peter the Protocol Reader?
CTC ships an update every 2 months, and Peter the Protocol Reader every 3 weeks. Most recently, CTC was updated on October 1, 2026 and Peter the Protocol Reader on October 5, 2026.

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