FreeOTP Authenticator vs SOLARMAN Smart
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
FreeOTP Authenticator
Generate one-time passwords for enhanced online account security. This app creates temporary codes that, when used with your regular password, significantly strengthen your login protection. It functions even without an internet connection.
- Generates one-time passwords
- Works offline (airplane mode)
- Supports Google, Facebook, GitHub, etc.
- Compatible with TOTP/HOTP protocols
- Open source software
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FreeOTP adds a second layer of security for your online accounts. This works by generating one-time passwords on your mobile devices which can be used in conjunction with your normal password to make your login nearly impossible to hack. These passwords can be generated even when your phone is in airplane mode. FreeOTP works with many of the great online services you already use, including Google, Facebook, Evernote, GitHub and many more! FreeOTP also may work for your private corporate security if they implement the standardized TOTP or HOTP protocols. This includes great enterprise solutions like FreeIPA. FreeOTP is open source and free software! Licensed under the Apache 2.0 license, you can obtain the source code for FreeOTP at https://fedorahosted.org/freeotp for review or modification. Contributions are welcome!
SOLARMAN Smart
This app provides intelligent energy management for global users with a focus on visual data display and comprehensive monitoring. It allows for quick plant setup, 24-hour remote monitoring of PV power plants, and efficient collaboration with business partners for operations and maintenance.
- Visual energy data display
- 24-hour remote monitoring
- Quick plant setup
- Authorization for collaboration
- Real-time and historical data
- Energy consumption tracking
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SOLARMAN Smart is a brand new generation of Intelligent Energy Management Application, which is specially designed for global users. With the basic features of full-on visual experience, excellent data display and all-round monitoring, it achieves the goal of convenient operation. 【Build a Plant within 1 min】 No need to fill in tedious information. SOLARMAN Big Data will help to enrich more contents. 【24-hour Remote Monitoring】 Go to SOLARMAN Smart APP to check running status of PV power plant at anytime and anywhere. Reveal all data (Production, Consumption, Battery, Grid, Real-time, Historical Data and etc,.) at a glance. 【Efficient Coordination】 Add authorization function. Users can authorize the plant you created to your business partner to do O&M cooperatively. Meanwhile, users can receive the plant from your business partner, which means users do not have to create a plant or configure the devices. 【More Functions】 Based on energy management field, SolarMAN-3.0 APP will keep the constantly innovation and bring better experience for every user. Dear Users, if you have any suggestions or comments, please feel free to send us a note and let us know how we are doing. Feedback Email：zhihao.huang@igen-tech.com
Screenshots
Verdict
The clearest difference is rating: SOLARMAN Smart at 4.6 against FreeOTP Authenticator's 3.2. SOLARMAN Smart also leads on update cadence (every 2 weeks vs every 6 months) and ratings volume (5.8K vs 172). FreeOTP Authenticator's advantage is iOS requirement (11.0 vs 15.1). On price, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
SOLARMAN Smart holds the better App Store score, 4.6 against 3.2. That said, the two scores are not equally well evidenced: SOLARMAN Smart has 5.8K ratings behind it against 172, so its average is the more settled of the two. Written reviews point the same way: 36% of FreeOTP Authenticator's written reviews are positive against 45% of SOLARMAN Smart's.
FreeOTP Authenticator ships an update every 6 months, SOLARMAN Smart every 2 weeks. The most recent releases landed on October 19, 2026 and October 22, 2026 respectively.
| Parameter | FreeOTP Authenticator | SOLARMAN Smart |
|---|---|---|
| Price | Free | Free |
| Rating | 3.2 (172 ratings) | 4.6 (5.8K ratings) — better |
| Positive reviews | 36.3% of reviews | 44.8% of reviews — better |
| Number of ratings | 172 | 5.8K — better |
| Update frequency | Every 6 months | Every 2 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 11.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 11 MB | 93 MB |
| Age rating | 4+ | 4+ |
| Developer | Red Hat | IGEN Tech Co., Ltd. |
Customer experience
FreeOTP Authenticator
SOLARMAN Smart
User reviews
FreeOTP Authenticator
From 172 App Store ratingsWhat we love
- 🚀 Simple and lightweight
- 🔒 Open source and privacy-focused
- 👍 Clean and intuitive interface
- 💡 Customizable icons for accounts
Room to improve
- 🐛 Crashes and bugs after recent updates
- 🔒 Lack of backup/restore functionality
- 💡 Limited customization options
- 👎 Unable to edit or delete accounts
SOLARMAN Smart
From 5.8K App Store ratingsWhat we love
- 👍 Easy to use
- 🚀 Reliable app
- 💡 Helpful for monitoring solar system
- 🔒 Secure app
Room to improve
- 🐛 Inaccurate data and metrics
- ⏱️ Slow updates and real-time issues
- 🔌 Lack of integration with smart home devices
- 🤔 Confusing UI and navigation
Bugs and requests
FreeOTP Authenticator
Reported bugs
3 issues- Camera not working for QR code scanning
- App crashing on launch or when unlocking accounts
- UI issues on larger iOS devices
Requested features
4 requests- Add ability to manually enter account details
- Implement iCloud/cloud backup sync
- Allow renaming and deleting of accounts
- Provide Apple Watch support
SOLARMAN Smart
Reported bugs
3 issues- Registration process issues
- Frequent crashes and login problems
- Inconsistent data display and sync issues
Requested features
4 requests- Add ability to control battery and inverter settings
- Improve historical data and export functionality
- Implement push notifications for grid failures and returns
- Provide more detailed consumption and production data
In-app purchases
FreeOTP Authenticator
No in-app purchases
SOLARMAN Smart
No in-app purchases
Questions
Is FreeOTP Authenticator free?
Is SOLARMAN Smart free?
Which has better reviews, FreeOTP Authenticator or SOLARMAN Smart?
Do FreeOTP Authenticator or SOLARMAN Smart have ads?
Which is updated more often, FreeOTP Authenticator or SOLARMAN Smart?
Other comparisons
