Interpolator vs Wader Pilot Logbook
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Interpolator
Easily find values within tables using interpolation for two or three rows. This utility app simplifies calculations without needing a separate calculator, making it ideal for various table-based environments.
- Two-row interpolation
- Three-row interpolation
- Table value lookup
- No calculator needed
- Cargo surveyor tool
- General table use
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This is a small app which makes it very easy to look up values in tables (math etc) when you have to interpolate both in two and in three rows. No more need for a calculator to interpolate manually. This app was designed primarily for cargo surveyors working with tank calibration tables, but the app does have its application in any environment where tables are used. As of 13th January 2015, this app has become FREE until further notice.
Wader Pilot Logbook
This app simplifies flight logging for pilots, offering an all-in-one solution to track flight hours and access essential information like weather reports. Cloud syncing ensures your records are always safe and accessible from anywhere, fostering a professional aviation network.
- Flight hour monitoring
- Integrated weather reports
- Cloud syncing for data backup
- Professional aviation network
- Accessible from anywhere
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The logbook that finally got it right. Wader is the digital logbook built for every pilot — student, GA, or airline. Beautiful interface, fast data entry, live airport data, and a growing pilot community, all in one place. LOG EVERY FLIGHT, EFFORTLESSLY Fast sector logging — crew, aircraft, airports, times, and remarks in seconds Import years of previous logbook data — easily done inside the app WORKS ANYWHERE, LOSES NOTHING Offline-first — fully functional at any aerodrome, no signal needed Cloud-synced and backed up automatically when you reconnect Export to CSV or PDF anytime, in formats pilots and employers use AIRPORT DATA IN YOUR POCKET Live METARs, TAFs, and statistical airport information Built for preflight planning and post-flight review A PILOT COMMUNITY WORTH JOINING Share flights and build a professional profile beyond a PDF logbook Stay current with aviation news and alert updates in the community feed Your entire flying journey, in your pocket. Download Wader today. Wader Aviation Corp is not liable for any resulting damage caused by using this application. Data is provided without guarantee as to accuracy. Weather data is sourced from third-party providers — always verify with official sources. Learn more at waderaviation.com/terms-of-use
Screenshots
Verdict
The clearest difference is in-app purchases: Interpolator at none against Wader Pilot Logbook's 1. Interpolator also leads on rating (4.9 vs 4.6) and ratings volume (74 vs 22). Wader Pilot Logbook's advantage is review sentiment (98% vs 67%) and update cadence (monthly vs every 4 months). On price, ads, monetization model 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. Wader Pilot Logbook sells 1 in-app purchase, starting at $79.99 per year. Interpolator asks for nothing beyond the download.
Interpolator holds the better App Store score, 4.9 against 4.6. Both are backed by a comparable volume of ratings — 74 and 22 respectively. Written reviews complicate that: 67% of Interpolator's written reviews are positive against 98% of Wader Pilot Logbook's, so the app with the better star average is not the one people write more warmly about.
Interpolator ships an update every 4 months, Wader Pilot Logbook monthly. The most recent releases landed on September 9, 2026 and September 23, 2026 respectively.
| Parameter | Interpolator | Wader Pilot Logbook |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (74 ratings) — better | 4.6 (22 ratings) |
| Positive reviews | 66.7% of reviews | 98.1% of reviews — better |
| Number of ratings | 74 — better | 22 |
| Update frequency | Every 4 months | Monthly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 12.0 — better | 16.0 |
| Further details — not scored | ||
| Size | 18 MB | 83 MB |
| Age rating | +4 | 4+ |
| Developer | ron mooring | Wader Aviation Corp |
Customer experience
Interpolator
Wader Pilot Logbook
In-app purchases
Interpolator
No in-app purchases
Wader Pilot Logbook
- Wader Pro Annual1 Year trial$79.991 Year
Questions
Is Interpolator free?
Is Wader Pilot Logbook free?
Which has better reviews, Interpolator or Wader Pilot Logbook?
Do Interpolator or Wader Pilot Logbook have ads?
Which is updated more often, Interpolator or Wader Pilot Logbook?
Other comparisons
