365 Days Calendar vs fivelevel
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
365 Days Calendar
This utility app converts between Julian and Gregorian dates and tracks Julian Day Numbers. It's designed for users in fields like astronomy, military operations, and historical research who need precise date management for daily operations.
- Julian to Gregorian date conversion
- Gregorian to Julian date conversion
- Julian Day Number tracking
- Historical date reference management
- Scientific date reference management
- User-friendly interface
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The Julian Date Calendar App is a simple yet powerful tool for converting between Julian and Gregorian dates, tracking Julian Day Numbers (JDN), and managing historical or scientific date references. Whether you're working in astronomy, military operations, food production, or historical research, this app offers accurate and efficient support for daily operations, all with a user-friendly experience.
fivelevel
This app provides essential tools for aircraft maintainers, including time conversions, date calculations, and reference data. It offers a streamlined experience with no subscriptions or unnecessary features, designed for efficiency on the flightline.
- Zulu & local time display
- Julian date calendar
- Preflight due calculator
- Conversion tools
- Searchable ICAO codes
- Apple Watch app
- Home screen widget
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5-Level gives aircraft maintainers the tools they actually use — no fluff, no subscriptions, just what you need on the flightline. Features: • Zulu & local time display • Julian date calendar • Preflight due calculator • Conversion tools • Searchable ICAO codes • Apple Watch app with complications • Home screen widget Built by a maintainer who got tired of doing math on the back of a 781.
Screenshots
Verdict
The clearest difference is price: fivelevel at Free against 365 Days Calendar's $1.99. fivelevel also leads on rating (5.0 vs 4.7) and update cadence (every 4 weeks vs every 2 months). 365 Days Calendar's advantage is chart position (#190 vs unranked) and ratings volume (26 vs 6). On ads and in-app purchases 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
fivelevel is free to download; 365 Days Calendar costs $1.99 up front. Neither carries in-app purchases, so what you see is what you pay.
fivelevel holds the better App Store score, 5.0 against 4.7. Both are backed by a comparable volume of ratings — 26 and 6 respectively.
365 Days Calendar ships an update every 2 months, fivelevel every 4 weeks. Both last shipped on October 25, 2026.
| Parameter | 365 Days Calendar | fivelevel |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.7 (26 ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 71.4% of reviews | — |
| Number of ratings | 26 — better | 6 |
| Update frequency | Every 2 months | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Best chart rank | #190 — better | — |
| Devices | iPhone, iPad | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 17.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 6 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Cyberdeploy Inc. | Adam Moody |
Customer experience
365 Days Calendar
fivelevel
In-app purchases
365 Days Calendar
No in-app purchases
fivelevel
No in-app purchases
