# C Compiler vs Locked In

The clearest difference is ads: Locked In at none against C Compiler's shown. Locked In also leads on update cadence (every 2 weeks vs every 4 months) and monetization model (free vs free with in-app purchases). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. C Compiler sells 4 in-app purchases, starting at $2.99 per month and Locked In sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

C Compiler ships an update every 4 months, Locked In every 2 weeks. The most recent releases landed on November 2, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | C Compiler | Locked In |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.3 (113 ratings)](https://appshunter.io/ios/app/c-compiler/id1265577717/reviews)** | — |
| Number of ratings | **113** | — |
| Positive reviews | 58.6% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 47 MB | 5 MB |
| Requires iOS | 18.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [sutheesh sukumaran](https://appshunter.io/developer/1262850647) | [OMAR DANIEL GRAZIANO](https://appshunter.io/developer/1896485759) |

## What reviewers say

### C Compiler

[App page](https://appshunter.io/ios/app/c-compiler/id1265577717)

This application provides an integrated development environment for C programming, complete with an offline tutorial and sample programs. It features syntax recognition and auto-formatting to aid users in writing and running complex C code.

**Highlights:** Run complex C programs, Offline C tutorial, Sample C programs, Syntax recognition IDE, Auto text formatting IDE, File opening and saving

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C Compiler Premium — Monthly | $2.99 | per month |
| C Compilar Premium — Yearly | $24.99 | per year |
| Remove Ads | $49.99 | one-time |
| LifeTime | $49.99 | one-time |


### Locked In

[App page](https://appshunter.io/ios/app/locked-in-prep-for-cysa-plus/id6770587466)

This study companion breaks down cybersecurity exam material into short, focused lessons with quick checks. It includes practice questions, mock exams, flashcards, and a searchable glossary to aid learning. Progress tracking and offline functionality are also available.

**Highlights:** Bite-sized lessons for CS0-003 exam domains, Visual diagrams for key concepts, Inline quick-checks and practice questions, Performance-based question simulations, Timed mock exams, Spaced repetition flashcards, Searchable glossary and progress tracking

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Locked-In Full Unlock | $9.99 | one-time |


## Frequently asked questions

### Is C Compiler free?

C Compiler is free to download, with in-app purchases available.

### Is Locked In free?

Locked In is free to download, with in-app purchases available.

### Do C Compiler or Locked In have ads?

C Compiler shows ads; Locked In does not.

### Which is updated more often, C Compiler or Locked In?

C Compiler ships an update every 4 months, and Locked In every 2 weeks. Most recently, C Compiler was updated on November 2, 2026 and Locked In on October 31, 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.*