Optica vs i.Terminal go
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Optica
This app assists opticians and optometrists with complex optical calculations. It helps explain optical concepts to clients and includes tools for lens transposition, vertex distance adjustments, and addition calculations.
- Lens transposition with optical cross representation
- Distometry for vertex distance power adjustments
- Over-correction calculation for toric lenses
- Theoretical addition calculation based on age and distance
- Approximate lens edge and center thickness calculation
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Optica-App 2 is the new version of Optica-App developed entirely from scratch. It is prepared by a server (optical and developer) and the calculation needs that occur in the task of optics and optometry have been taken into account. This application is used to calculate, but also to show or explain to clients or patients some concepts that may be difficult to represent. This implies added value in the relationship with customers. The application consists of 5 calculation applications: 1. Transposition: Calculates the transposition of the spherocylindrical formula and also represents the optical cross with the arrangement of the powers. 2. Distometry: Performs the calculation of spherical and / or toric powers according to the vertex distance (lens-eye distance). 3. Over-correction in toric lens considering its rotation. 4. Addition: Calculate the theoretical addition of a person based on working distance and age. 5. Thickness of lenses *: We obtain the edge and center thickness at the main points of the lens. Of great help to advise the clients in the decision making regarding what type of lens to choose being a good selling point. Important: (Lens thickness *: The calculations you make are approximate and do not take into account the curvature of the lens and other parameters that lens providers can offer. For the exact calculation it is necessary to use the programs of the lens providers.)
i.Terminal go
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ZEISS i.Terminal go generates centration results via the iPad® tablet for the eye care professional just in a short time. The application works without any additional hardware apart from the ZEISS calibration tool, allowing the user a high level of flexibility. All necessary fitting parameters* can be accurately measured wherever and whenever they are needed in the patient consultation process. Furthermore, ZEISS i.Terminal go supports business differentiation by offering a new digital patient experience. ZEISS i.Terminal go supports an efficient and smooth dispensing workflow that brings convenience to an optician’s practice. * e.g. PD(R), PD (L), Total PD, x(R), x(L), FH (R), FH (L), SH(R), SH (L), BVD, FrameFit, C-Code, Diameter (R), Diameter (L), Pantoscopic angle, Wrap angle, Box-length A, Box-width B, Distance Between Lenses
Screenshots
Verdict
The clearest difference is update cadence: i.Terminal go at every 3 months against Optica's every 62 months. Optica's advantage is device support (3 vs 1) and iOS requirement (10.0 vs 13.0). On price, ads and in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Optica ships an update every 62 months, i.Terminal go every 3 months. The most recent releases landed on October 2, 2026 and September 18, 2026 respectively.
| Parameter | Optica | i.Terminal go |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 92.9% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 62 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPad |
| Requires iOS | 10.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 83 MB | 57 MB |
| Age rating | 4+ | 17+ |
| Developer | Luis Cornejo | Carl Zeiss AG |
In-app purchases
Optica
No in-app purchases
i.Terminal go
No in-app purchases









