Comparison

AstroOcular vs Zenith Annotation

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

Head to head
About

AstroOcular

Features
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AstroOcular is a focused camera app for recording the Moon, planets, and observations through a telescope eyepiece. The app opens straight into the camera, avoids automatic lens switching by using physical rear cameras when available, and provides a visual guide to help center the iPhone on the eyepiece. Key features: - Photo and video capture through a telescope eyepiece - Physical rear lens selection - Automatic alignment guide and manual reticle fallback - Timer to reduce shake - Pro controls for zoom, focus, exposure, ISO, white balance, resolution, and FPS - Saves locally to the Photos library - No ads, analytics, purchases, or backend Video audio is off by default and microphone permission is requested only if you enable audio.

About

Zenith Annotation

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Study and present your astronomical images on iPhone and iPad. Zenith Annotation brings image import, astrometry, annotations, and presentation tools together in a guided workflow. Explore the field โ€ข Open the images you choose from Photos or Files, including TIFF and TIF images. โ€ข Solve a field online when you request it and agree to send a working copy. โ€ข Browse catalogs and review object and session details. Prepare your annotations โ€ข Organize layers, labels, data, and visual styles. โ€ข Keep project progress on your device. โ€ข Preserve the original file: online solving uses a reduced grayscale copy, not the original. Present your work โ€ข Design carousels with editable text, charts, palettes, and animations. โ€ข Arrange images and text in collages. โ€ข Export a result to save or share yourself. Online solving requires a connection and your explicit action. For this feature, the app sends Astrometry.net a reduced grayscale copy of up to 2048 pixels without EXIF metadata. Zenith Annotation does not transmit the original file or publish your images to social networks. Annotation Studio Choose how to start: try 14 days free if your Apple account is eligible, or pay for the year up front. The plan automatically renews after the trial at the price shown by your App Store; in Mexico, that price is MXN $549 per year. Direct payment charges the displayed annual price at the start. Manage or cancel renewal in your Apple account settings. Purchase restoration is included. Terms of Use (Apple Standard EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

AstroOcular4 screens
Zenith Annotation3 screens

Verdict

The call

The clearest difference is in-app purchases: AstroOcular at none against Zenith Annotation's 2. Zenith Annotation's advantage is update cadence (every 10 days vs every 5 weeks) and device support (3 vs 1). On price and ads there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

Both are free to download. Zenith Annotation sells 2 in-app purchases, starting at $24.99 per year. AstroOcular asks for nothing beyond the download.

UpkeepUpdate frequency

AstroOcular ships an update every 5 weeks, Zenith Annotation every 10 days. Both last shipped on October 31, 2026.

Scorecard4 real differences ยท 2 level
AstroOcular versus Zenith Annotation: the parameters behind the verdict, then further details
ParameterAstroOcularZenith Annotation
PriceFreeFree
Update frequencyEvery 5 weeksEvery 10 days โ€” better
AdsNoNo
In-app purchasesNo โ€” betterYes
DevicesiPhoneiPhone, iPad, iPod โ€” better
Requires iOS17.015.0 โ€” better
Further details โ€” not scored
Size2 MB47 MB
Age rating4+4+
DeveloperAron ScolaroEduardo Martinez Gomez

In-app purchases

None

AstroOcular

No in-app purchases

2 purchases

Zenith Annotation

Subscriptions2
  • Annotation Studio with Trial14 Days trial$24.991 Year
  • Annotation Studio Annual$24.991 Year

Questions

Is AstroOcular free?
AstroOcular is free to download, with no in-app purchases.
Is Zenith Annotation free?
Zenith Annotation is free to download, with in-app purchases available.
Do AstroOcular or Zenith Annotation have ads?
Neither AstroOcular nor Zenith Annotation shows ads.
Which is updated more often, AstroOcular or Zenith Annotation?
AstroOcular ships an update every 5 weeks, and Zenith Annotation every 10 days. Most recently, AstroOcular was updated on October 31, 2026 and Zenith Annotation on October 31, 2026.

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