Comparison

coreVIEWER vs OpenAPI Viewer

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

Head to head
About

coreVIEWER

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With the app coreVIEWER measurement data of the smart sensor can be transferred to a mobile device, displayed and recorded. All sensors, measuring amplifiers and gateways can be connected, configured and visualized via the coreVIEWER app. coreVIEWER in a short portrait: Overview of all available sensors Simultaneous connection with up to 4 measuring amplifiers Live display and recording of measurement data Configuration of measuring amplifier and gateway Starting the data logger on the measuring amplifier Different display modes Programming of thresholds and events Measurement data in dashboard view: Measurement data are clearly displayed on the dashboard. For each measured value, the average value is displayed with min / max values, the time interval is configurable. The measured values can be reset by a tare function (to zero). Measurement data in diagram view: By tapping on a measured variable, it is illustrated in a diagram as a function of time. Recording measurements: A REC button is used to start or end a recording of the measured variables, which is saved as a CSV file on the device.

About

OpenAPI Viewer

Features
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OpenAPI Viewer is the easiest way to explore, test, and understand OpenAPI 3.0 and 3.1 specifications on your Apple devices. Whether you're integrating a third-party API, reviewing your team's documentation, or testing endpoints on the go, OpenAPI Viewer gives you a clean, native interface built for developers. EXPLORE YOUR API Open any JSON or YAML OpenAPI file and instantly browse all endpoints organized by tag. Search across operations, schemas, parameters, and examples in seconds. View rich documentation for every endpoint — including descriptions, parameters, request bodies, and responses — with schema constraints, validation rules, and example values displayed clearly. TRY IT OUT Send real HTTP requests directly from the app. Fill in path, query, header, and cookie parameters, provide a request body, configure authentication, and hit Send. View the response body, status code, duration, and validation results — all without leaving the app. EXPORT AND SHARE Copy any request as a cURL command, JavaScript fetch, Swift URLSession, or Python httpx snippet — ready to paste into your terminal or codebase. BUILT FOR APPLE PLATFORMS A thoughtfully designed native UI makes even complex, sprawling APIs easy to read. Color-coded methods, clear badge indicators, and structured layouts — built for Apple platforms from the ground up. FREE TO USE OpenAPI Viewer is completely free with no subscriptions or paywalls. If you find it useful, you can support development through an optional tip jar — entirely your choice. KEY FEATURES • Open JSON and YAML OpenAPI 3.0 and 3.1 specifications • Browse endpoints by tag with HTTP method filters • Full-text search across operations, schemas, examples, and headers • Send real HTTP requests with a built-in inspector • Configure Bearer, API key, Basic, and OAuth credentials • Request history • Copy requests as cURL, fetch, URLSession, or httpx • Schema viewer with constraints, enums, and examples • Native on iPhone, iPad, and Mac

Screenshots

coreVIEWER4 screens
OpenAPI Viewer3 screens

Verdict

The call

The clearest difference is in-app purchases: coreVIEWER at none against OpenAPI Viewer's 3. coreVIEWER also leads on iOS requirement (13.0 vs 18.1). OpenAPI Viewer's advantage is update cadence (every 2 weeks vs every 2 months). On price, ads and device support there is nothing between them.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

Both are free to download. OpenAPI Viewer sells 3 one-off in-app purchases. coreVIEWER asks for nothing beyond the download.

UpkeepUpdate frequency

coreVIEWER ships an update every 2 months, OpenAPI Viewer every 2 weeks. The most recent releases landed on October 8, 2026 and October 5, 2026 respectively.

Scorecard3 real differences Ā· 3 level
coreVIEWER versus OpenAPI Viewer: the parameters behind the verdict, then further details
ParametercoreVIEWEROpenAPI Viewer
PriceFreeFree
Update frequencyEvery 2 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS13.0 — better18.1
Further details — not scored
Size71 MB13 MB
Age rating4+4+
Developercore sensing GmbHVictor Manuel Puga Ruiz

In-app purchases

None

coreVIEWER

No in-app purchases

3 purchases

OpenAPI Viewer

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$9.99

Questions

Is coreVIEWER free?
coreVIEWER is free to download, with no in-app purchases.
Is OpenAPI Viewer free?
OpenAPI Viewer is free to download, with in-app purchases available.
Do coreVIEWER or OpenAPI Viewer have ads?
Neither coreVIEWER nor OpenAPI Viewer shows ads.
Which is updated more often, coreVIEWER or OpenAPI Viewer?
coreVIEWER ships an update every 2 months, and OpenAPI Viewer every 2 weeks. Most recently, coreVIEWER was updated on October 8, 2026 and OpenAPI Viewer on October 5, 2026.

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