Comparison

PF vs ScopeWizard

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

Head to head
About

PF

Read full description

The PF-L Assist is a free app for smartphones and tablets in order to support polar axis setting which is basic to your equatorial mount. The PF-L Assist app makes it possible to set the field of view of your polar alignment scope PF-L II at the specific date and time of your observation. (It is usable in both the northern and southern hemisphere.) [Functions] Orientation of the scale and position of starts are indicated in real time. The orientation of the scale and the position of the stars are computed automatically in accordance with the date, time and site of your observing session. An image of the field of view seen though the polar alignment scope at the time of observing is indicated on the screen of your smartphone or tablet. It is available for both the northern and southern hemisphere (Automatic or manual operation are available). Adjacent stars of no relevance to the polar alignment are not indicated in the imaginary field of view so that you can instantly recognize the position of the stars you want. After you confirm the position of the stars with the app, it is easier to polar align your PF-L scope. [How to use] Usage in the northern hemisphere is shown as an example. (1) Start up the app. (2) While looking through the polar alignment scope, turn the scope’s scale so that it comes to the same orientation as the scale indicated on the screen of the app. (3) The direction of the scope’s scales is parallel to the scale on the app. (4) Bring Polaris to the designated position on the scale in the field of view of the polar alignment scope by adjusting the equatorial mount in azimuth and/or altitude directions and finish the polar alignment setting. For beginners and those who are unfamiliar with the polar alignment scope, it may take time to set up the equatorial mount. The polar alignment requires a process that matches the reticle with the actual rows of stars by turning the polar alignment scope. The app enables you to simplify this process and quickly advance to the polar alignment by Polaris. Vixen’s polar alignment scopes are designed to align the equatorial mount using Polaris and two reference stars named Delta UMi and 51 Cep to increase accuracy of the polar alignment (in the northern hemisphere). If the above two reference stars are added to your polar alignment, you will increase the setting accuracy and tracking precision. These two reference stars are less bright than Polaris and may be difficult to find. Using the app you will find it easier to locate the two reference stars. Assisting the polar alignment, the PF-L Assist app is a highly convenient app for those who use an equatorial mount first time. [Enlargement] The imaginary field of view of the polar alignment scope on the app is enlarged and you can easily check the position of the stars. [Night vision] Switching ON the night vision mode in the setting screen will turn the screen of the app to illuminate in red, which allows you to keep your eye's sensitivity in night observing. [Support page] Help, support page is provided in the setup menu. The support page links you to the Vixen web site.

About

ScopeWizard

This app simplifies telescope, eyepiece, and camera calculations with a unified database of equipment. Easily mix and match your gear or input custom values for precise specifications.

Highlights
  • Unified formula database
  • Equipment database
  • Mix and match gear
  • Custom value input
  • Telescope specifications calculation
Features
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There are numerous formulas for computing the specifics of your telescope, eyepieces, and camera's characteristics when used together. ScopeWizard brings those formulas together in one handy place. An included database of telescopes, eyepieces, and cameras can be used to mix and match your equipment, or you can enter custom values manually.

Screenshots

PF2 screens
ScopeWizard4 screens

Verdict

The call

The clearest difference is update cadence: PF at every 11 months against ScopeWizard's every 25 months. PF also leads on iOS requirement (12.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

PF ships an update every 11 months, ScopeWizard every 25 months. The most recent releases landed on October 14, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
PF versus ScopeWizard: the parameters behind the verdict, then further details
ParameterPFScopeWizard
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 11 months — betterEvery 25 months
AdsNoNo
In-app purchasesNoNo
Monetization—Free
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS12.0 — better17.0
Further details — not scored
Size8 MB4 MB
Age rating4+4+
DeveloperVixen Co.,Ltd.Richard Wright

In-app purchases

None

PF

No in-app purchases

None

ScopeWizard

No in-app purchases

Questions

Is PF free?
PF is free to download, with no in-app purchases.
Is ScopeWizard free?
ScopeWizard is free to download, with no in-app purchases.
Do PF or ScopeWizard have ads?
Neither PF nor ScopeWizard shows ads.
Which is updated more often, PF or ScopeWizard?
PF ships an update every 11 months, and ScopeWizard every 25 months. Most recently, PF was updated on October 14, 2026 and ScopeWizard on October 24, 2026.

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