On vs Sterling Vascular
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
On
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The all new on Call Calendar! - Track your on-calls during the period you specify. - Add other coworkers to track which days they are on-call. - View your progress and achievements as you go. - Multiple themes to match your iPhone color with light and dark modes. Coming soon: notifications, calendar widget, themes! - Uses: Medical residents, Job Personal journal
Sterling Vascular
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Sterling Vascular is a clinical reference and decision-support companion designed for qualified healthcare professionals caring for patients with venous, arterial, aortic, and thrombotic disease. Quickly access practical guidance, classification systems, scoring tools, procedural checkpoints, and safety checklists at the point of careβeven without an internet connection. FEATURES β’ Searchable vascular clinical reference library β’ CEAP classification builder β’ Venous Clinical Severity Score calculator β’ Wells DVT clinical probability tool β’ Villalta post-thrombotic syndrome score β’ SVP pelvic venous classification tool β’ Venous disease evaluation and management pathways β’ DVT and anticoagulation references β’ Superficial and deep venous intervention guidance β’ Procedural safety checklists and follow-up guidance β’ Arterial, carotid, and aortic disease references β’ On-device favorites for frequently used material β’ Core clinical content available offline PRIVACY Sterling Vascular does not require an account and does not collect or store patient information. Favorites and tool selections remain on the userβs device. IMPORTANT Sterling Vascular is intended for qualified healthcare professionals as an educational reference and cognitive aid. It does not provide patient-specific medical advice and is not a substitute for independent clinical judgment, complete source guidance, institutional policy, device instructions for use, or consultation with an appropriately qualified clinician. Users are responsible for confirming all information, calculations, medication regimens, indications, contraindications, and treatment decisions before clinical use.
Screenshots
Verdict
The clearest difference is iOS requirement: Sterling Vascular at 16.4 against On's 26.0. On price, update cadence, ads and in-app purchases there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On ships an update every 6 days, Sterling Vascular every 9 days. The most recent releases landed on October 25, 2026 and October 29, 2026 respectively.
| Parameter | On | Sterling Vascular |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 days β better | Every 9 days |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad β better |
| Requires iOS | 26.0 | 16.4 β better |
| Further details β not scored | ||
| Size | 14 MB | 32 MB |
| Age rating | 4+ | 17+ |
| Developer | Cesar Mejia Valero | Sloane Sterling |
In-app purchases
On
No in-app purchases
Sterling Vascular
No in-app purchases









