Secret vs SensorLogger
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Secret
Securely send and receive encrypted messages that only the intended recipient can read. Protect your private conversations with end-to-end encryption and a password. Messages are not stored on your device after decryption.
- End-to-end message encryption
- Password protection for decryption
- Shake to clear messages
- Messages not stored on device
- Supports any language and emoji
- Multiple language localizations
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Send messages to your friends and colleagues – encrypted so that only they can read the message. Tap and type your message, and with one tap you can encrypt and then send your message, or copy it to the clipboard for pasting in to another application. Shake to clear your message. Secret – just between you and me... When someone who has Secret installed receives a Secret-encrypted message, they need only click on the message and they are taken straight to Secret where they can decrypt the message with a pre-arranged password. It's as simple as that! Secret uses DES symmetric encryption to keep your messages safe. You can use it anywhere you need to send a message that you don't want others to read. The decrypted message is not stored on your phone, so if someone intercepts or finds your phone, they can't read your messages without knowing the password. Secret works in any language, and even with emoji. Secret is also fully localised in English, French, Japanese, Italian, Greek, Spanish, Malay, Indonesian, German, Korean, and Simplified and Traditional Chinese. Secret – it's the easiest way to secure the messages you send and receive.
SensorLogger
Record acceleration, gyroscope, and magnetic field data in real-time or at higher frequencies. Export your sensor readings as a CSV file for further analysis. Optimize data collection by toggling visualization settings.
- Log acceleration, gyroscope, and magnetic field
- Synchronous sensor measurement
- Real-time data visualization
- Adjustable sampling frequency
- Export data as CSV file
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A logger App that can measure acceleration, gyroscope, and magnetic field synchronously, then export as a CSV file. The measured values can be visualized in real-time by enabling "Realtime visualization". On the other hand, when you want to measure at a more accurate frequency, disabling "Realtime visualization" is preferred. Also, if the sampling rate is set too high, the same value may be sampled many times depending on the hardware specifications.
Screenshots
Verdict
The clearest difference is price: Secret at Free against SensorLogger's $0.99. Secret also leads on device support (3 vs 1). SensorLogger's advantage is rating (4.5 vs 3.0) and update cadence (every 3 weeks vs every 10 months). On ads, in-app purchases and monetization model 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
Secret is free to download; SensorLogger costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
SensorLogger holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: SensorLogger has 10 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 55% of Secret's written reviews are positive against 78% of SensorLogger's.
Secret ships an update every 10 months, SensorLogger every 3 weeks. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.
| Parameter | Secret | SensorLogger |
|---|---|---|
| Price | Free — better | $0.99 |
| Rating | 3.0 (1 ratings) | 4.5 (10 ratings) — better |
| Positive reviews | 54.5% of reviews | 78.3% of reviews — better |
| Number of ratings | 1 | 10 — better |
| Update frequency | Every 10 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, Mac — better | iPhone |
| Requires iOS | 26.0 | 16.0 — better |
| Further details — not scored | ||
| Size | 13 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | curmi.com | Kazumasa Wakamori |
Customer experience
Secret
SensorLogger
In-app purchases
Secret
No in-app purchases
SensorLogger
No in-app purchases









