Stretch Affect vs PD+
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stretch Affect
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Download the Stretch Affect App today to plan your wellness journey! From this mobile App you can view class schedules, sign-up for classes, as well as view the studio’s location and contact information. You can also click through to our social pages! Optimize your time and maximize the convenience of signing up for classes from your device! Download this App today!
PD+
This app measures pupillary distance (PD) and fitting heights using your device's camera. It offers various optical calculators for lens adjustments and acuity estimations. Accurate measurements are crucial for optimal lens centering and multifocal lens positioning.
- Pupillary distance measurement
- Fitting height measurement
- Binocular and monocular PD
- Rx transposition calculator
- Vertex adjustment calculator
- Crossed cylinders calculator
- Minimum blank size calculator
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PUPILLARY DISTANCE PD+ instantly measures pupillary distance (PD) by capturing & processing a single, hi-res facial photo. Measurement accuracy is guaranteed to be the highest achievable by the capability of your device's camera system. Far and near PD's -- binocular & monocular -- are always available at no cost. FITTING HEIGHT PD+ instantly measures Fitting Heights for the frames you currently have on. Accurate fitting height and PD measurements are needed to ensure that lenses being made for your frames are properly centered on your eyes to achieve optimal viewing clarity. In addition, Fitting Heights are used to position segments for fitting multifocal lenses. Please note: Fitting Height is currently only supported on devices equipped with the TrueDepth or LIDAR camera systems (e.g., iPhone X and later non-SE models). CALCULATORS - Rx Transposition - Vertex Adjustment - Crossed Cylinders (over-refraction) - Keratometry Conversion - Visual Acuity Scale - Estimated visual acuity - Minimum Blank Size (MBS) - Simple Magnifier and Spectacle Magnifications
Screenshots
Verdict
The clearest difference is in-app purchases: Stretch Affect at none against PD+'s 1. Stretch Affect also leads on iOS requirement (11.0 vs 17.6). PD+'s advantage is update cadence (every 2 months vs every 5 months). On price, ads 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
Both are free to download. PD+ sells 1 one-off in-app purchase. Stretch Affect asks for nothing beyond the download.
Stretch Affect ships an update every 5 months, PD+ every 2 months. The most recent releases landed on October 29, 2026 and October 27, 2026 respectively.
| Parameter | Stretch Affect | PD+ |
|---|---|---|
| Price | Free | Free |
| Rating | — | 4.7 (555 ratings) — better |
| Positive reviews | — | 54.2% of reviews |
| Number of ratings | — | 555 — better |
| Update frequency | Every 5 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free with in-app purchases |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 11.0 — better | 17.6 |
| Further details — not scored | ||
| Size | 50 MB | 76 MB |
| Age rating | 4+ | 4+ |
| Developer | Stretch Affect LLC | Zernike LLC |
Bugs and requests
Stretch Affect
Not enough reviews yet to summarise bugs or requests.
PD+
Reported bugs
5 issues- Face size unstable
- Camera distance sensitive
- App keeps crashing
- PD feature doesn't work on iPad
- Page stays black on iPad
Requested features
1 request- Can this app measure the PD for progressive lenses for right and left eyes?
In-app purchases
Stretch Affect
No in-app purchases
PD+
- Lifetime Subscription$7.99
