Units Free vs LIN Authenticator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Units Free
Easily convert between various units across multiple categories like length, temperature, and weight. Access past conversions through a history list and send calculations via email. This free version offers core functionality with an option to upgrade for full category access.
- Multiple unit categories (length, temp, weight, etc.)
- Metric and imperial system support
- Conversion history list
- Send calculations via email
- iPad multitasking support
Read full descriptionHide full description
Convert between many units from several categories and different unit systems (metric, imperial, ...). Features: - categories: length, temperature, capacity, weight, energy, power, pressure, area - access previous conversions from the history list - categories have different colors (in the history as well) - flip units - send calculations by email - support for the iPhone 6 and 6+ - support for the iPad multitasking (split view..) (Free version: requires upgrade to arbitrarily switch categories)
LIN Authenticator
Read full descriptionHide full description
The LIN Authenticator provides easy and secure multi-factor authentication for your account. It primary supports 2nd factor for applications owned by Lindner, but can also be used for private accounts for basic OTP Tokens.
Screenshots
Verdict
The clearest difference is in-app purchases: LIN Authenticator at none against Units Free's 1. Units Free's advantage is update cadence (every 5 months vs every 12 months) and iOS requirement (5.1.1 vs 15.6). 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. Units Free sells 1 one-off in-app purchase. LIN Authenticator asks for nothing beyond the download.
Units Free ships an update every 5 months, LIN Authenticator every 12 months. The most recent releases landed on August 15, 2026 and September 9, 2026 respectively.
| Parameter | Units Free | LIN Authenticator |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 5 months — better | Every 12 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 5.1.1 — better | 15.6 |
| Further details — not scored | ||
| Size | 3 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Piet Jonas | NetKnights GmbH |
In-app purchases
Units Free
- Units Free Upgrade$0.99
LIN Authenticator
No in-app purchases
