# Histo! vs OnERcall

The clearest difference is price: OnERcall at Free against Histo!'s $9.99. OnERcall also leads on update cadence (every 6 weeks vs every 11 months). Histo!'s advantage is iOS requirement (13.0 vs 15.0). On rating, review sentiment, ratings volume and ads there is nothing between them.

OnERcall is free to download; Histo! costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for Histo! against 5.0 for OnERcall. Both are backed by a comparable volume of ratings — 29 and 14 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Histo! ships an update every 11 months, OnERcall every 6 weeks. The most recent releases landed on October 15, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Histo! | OnERcall |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | [5.0 (29 ratings)](https://appshunter.io/ios/app/histo/id1128927858/reviews) | [5.0 (14 ratings)](https://appshunter.io/ios/app/onercall/id1544404583/reviews) |
| Number of ratings | **29** | 14 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 6 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 456 MB | 125 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [John Ash](https://appshunter.io/developer/1128927857) | [OnERcall](https://appshunter.io/developer/1544404585) |

## What reviewers say

### Histo!

[App page](https://appshunter.io/ios/app/histo/id1128927858)

This medical study aid helps users learn and test their knowledge of histology. It features a vast library of identification slides, interactive learning modes, and a search function for efficient study.

**Highlights:** 2179 identification slides, 19 Main Topics and 148 Subtopics, Offline functionality, Labeled slide mode with interactive labels, Learn, Quiz, and Test modes, Marking and review of slides, Searchable keywords

**Features:** Vision Pro support

**In-app purchases:** none


### OnERcall

[App page](https://appshunter.io/ios/app/onercall/id1544404583)

Connect with a US-licensed Emergency Medicine Physician 24/7 for non-severe medical concerns. Get quick answers, diagnoses, and prescriptions without insurance or monthly fees. Avoid ER visits for minor issues.

**Highlights:** 24/7 physician access, Video and audio consultations, Diagnosis and treatment plans, Prescription services, HIPAA compliant, Flat fee per visit

**Features:** Apple Wallet

**In-app purchases:** none


## Frequently asked questions

### Is Histo! free?

Histo! costs $9.99, with no in-app purchases.

### Is OnERcall free?

OnERcall is free to download, with no in-app purchases.

### Which has better reviews, Histo! or OnERcall?

Histo! and OnERcall are both rated 5.0 out of 5 on the App Store, from 29 and 14 ratings respectively.

### Do Histo! or OnERcall have ads?

Neither Histo! nor OnERcall shows ads.

### Which is updated more often, Histo! or OnERcall?

Histo! ships an update every 11 months, and OnERcall every 6 weeks. Most recently, Histo! was updated on October 15, 2026 and OnERcall on September 15, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*