PD+ vs Haibi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
Haibi
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Every app tracks what you do. Haibi shows you why you do it. One bad night of sleep turns into a skipped workout. The skipped workout turns into a delivery order. The order turns into a $60 hole in your budget and a mood that wrecks the next night too. That chain is real. It's just invisible when your sleep lives in one app, your money in another, and your food in a third. Haibi keeps all of it in one place, so the chain finally shows up on screen. Not "you spent more this month." The actual reason, and the thing it started as two days earlier. Meet Bee, your assistant with opinions. Bee watches the whole board. It buzzes you in the morning after reading how you slept. If the night was rough, it asks if it should set your training lighter. One tap and your actual gym session scales down. It adds your todos when you talk to it. And yes, you can talk to it out loud. MONEY, WITHOUT THE SPREADSHEET ENERGY - Connect your bank and see spending sorted by behavior, not category codes - The Audit: Bee cross-examines three months of your spending. Bring excuses. - The Reveal: a Wrapped-style sequence of the numbers you've been avoiding - Month-over-month patterns, subscription mapping, and what your habits cost you in ten years BODY, ON AUTOPILOT - Point your camera at food. Photo, macros, done. - Build workout splits, track progressive overload, and let recovery scale your loads - Sleep trends that actually connect to the rest of your day - Fasting, steps, cardio, sport training. One system instead of ten apps. MIND, FINALLY IN THE LOOP - Mood check-ins that take two seconds - Journals, habits, and streaks that feed the same mirror - What your sleep does to your spending. What your money does to your mood. LIFE, BROKEN INTO TUESDAYS - Fractal missions turn a five-year dream into this week's tasks - Duels: challenge friends and let the step counts settle it - A calendar and todo system Bee can actually manage for you PRIVATE BY ARCHITECTURE Most of what you track never leaves your phone. Bank connections run through Plaid, so we never see your credentials. We don't sell your data. Health data is processed on your device. Your journals are not training data. The full policy is short and readable, the way it should be. Haibi offers optional subscriptions with a free trial. Subscriptions auto-renew unless cancelled at least 24 hours before the period ends. Manage in your Apple ID settings. Terms: https://haibi-production.up.railway.app/terms Privacy: https://haibi-production.up.railway.app/privacy The mirror is ready when you are.
Screenshots
Verdict
The clearest difference is update cadence: Haibi at every 4 days against PD+'s every 2 months. Haibi also leads on iOS requirement (15.1 vs 17.6). 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
Both are free to download. PD+ sells 1 one-off in-app purchase and Haibi sells 2 in-app purchases, starting at $8.99 per month. Whichever you choose, the download price is not the number that matters.
PD+ ships an update every 2 months, Haibi every 4 days. The most recent releases landed on November 3, 2026 and October 30, 2026 respectively.
| Parameter | PD+ | Haibi |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (557 ratings) — better | — |
| Positive reviews | 54.2% of reviews | — |
| Number of ratings | 557 — better | — |
| Update frequency | Every 2 months | Every 4 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 76 MB | 108 MB |
| Age rating | 4+ | 17+ |
| Developer | Zernike LLC | Zachary Kent Reynolds |
Bugs and 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?
Haibi
Not enough reviews yet to summarise bugs or requests.
In-app purchases
PD+
- Lifetime Subscription$7.99
Haibi
- Hai – Core HAIBI Access14 Days trial$8.991 Month
- Bi – HAIBI AI + Full Access14 Days trial$17.991 Month









