# API Signal — API Monitoring for Developers

> API Monitoring for Developers (iPhone/iPad app by Masakatsu Aida.)

- Source: https://appshunter.io/ios/app/api-signal/id6779543008 (this page in markdown: same URL + `.md`)
- Developer: [Masakatsu Aida](https://appshunter.io/developer/6779135295)
- Category: Developer Tools, Utilities
- Price: Free with in-app purchases
- Age rating: 17+
- Requires: iOS 16.4 · 58 MB
- Languages: American English
- Released: 2026-07-13
- Data updated: 2026-07-17
- User reviews in markdown: https://appshunter.io/ios/app/api-signal/id6779543008/reviews.md

## What is API Signal?

API Signal is an API monitoring service built for developers who care about visibility, authentication, and operational clarity.

Register API endpoints, monitor HTTP status codes and JSON responses, and review recent failures from a clean dashboard designed for daily development and operations work.

API Signal supports GitHub authentication, making it easy for developers to sign in with an identity they already use. Your monitoring data is synced across web and mobile apps, so you can check endpoint status and failure history from the environment that fits your workflow.

The service is designed with a security-conscious and distributed architecture in mind. API checks, user access, logs, and notifications are handled through separated operational layers, helping keep monitoring stable and predictable as usage grows.

Key features:

GitHub sign-in for developer-friendly access

Cross-platform data sync across web and mobile apps

HTTP status monitoring for registered API endpoints

JSON response validation for practical API health checks

Failure logs focused on recent problems and debugging context

Notification support for operational awareness

API Signal is not just a simple uptime checker. It is a focused monitoring tool for developers who want to see API failures early, keep operational signals organized, and manage checks from multiple platforms without losing context.

Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

## Pricing and in-app purchases

Base price: Free.

**Subscriptions**

| Subscription | Price | Period |
| --- | --- | --- |
| Standard Monthly | $39.99 | per month |
| Starter Monthly | $5.99 | per month |



## Version history (last 1 release)

### 1.0 — 2026-07-13

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-17.*