Si vs Penlight.
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Si
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Features 1. APP remote monitoring and management, Optional automatic/manual mode 2. APP fast switch light,light status monitoring 3. Scan QR code to share light to friends 4. Drive away the birds
Penlight.
This app provides a digital penlight with adjustable brightness and a built-in ruler for quick measurements. It also features color inversion for different examination needs and easy calibration using a credit card.
- Adjustable digital penlight brightness
- Credit card calibration for accuracy
- Color inversion for light/dark modes
- Metric and imperial ruler
- Educational examination tool
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Key Features: - Digital Penlight: Adjustable brightness slider for precise illumination - Easy Calibration: Quickly calibrate with a credit card to for accurate measurements - Color Inversion: Easily switch between light and dark modes for different examination needs - Ruler: Metric and imperial ruler for quick measurements Disclaimer: This app is intended for educational purposes only. It is not to be used for the diagnosis or treatment of any medical condition.
Screenshots
Verdict
The clearest difference is price: Si at Free against Penlight.'s $1.99. Si also leads on iOS requirement (9.1 vs 16.0). Penlight.'s advantage is update cadence (daily vs every 5 months). On 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
Si is free to download; Penlight. costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Si ships an update every 5 months, Penlight. daily. The most recent releases landed on September 8, 2026 and September 14, 2026 respectively.
| Parameter | Si | Penlight. |
|---|---|---|
| Price | Free — better | $1.99 |
| Rating | — | 5.0 (1 ratings) — better |
| Number of ratings | — | 1 — better |
| Update frequency | Every 5 months | Daily — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Paid |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 9.1 — better | 16.0 |
| Further details — not scored | ||
| Size | 12 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | 旭日东方 | My Call Bag LLC |
In-app purchases
Si
No in-app purchases
Penlight.
No in-app purchases
